Congenital Eye Abnormalities: Recognition, Associations and Emergency Referral

Scope. This lecture expands the supplied 109-slide deck, Congenital Anomalies in the Eye, into a clinical recognition and referral guide. It follows the deck through the eyelids, cornea, uveal tract and pupil, crystalline lens, retina and choroid, macula, optic disc and nerve, vitreous and persistent fetal vasculature, and the lacrimal system. The source presentation includes many image-only slides; each named condition and visual concept is represented here in text. Several old terms, thresholds and claims in the deck are qualified where they could mislead current clinical practice.

Learning objectives

• Use an age-appropriate history and examination to identify congenital ocular anomalies and decide whether referral is routine, urgent or immediate.
• Recognize the eyelid, corneal, iris, lens, retinal, optic-nerve, vitreous, lacrimal and orbital abnormalities named in the supplied deck.
• Distinguish appearance variants from true structural disease and identify signs of amblyopia, glaucoma, corneal exposure, retinal detachment or leukocoria.
• Recognize important associations such as aniridia with a possible WT1 deletion/WAGR spectrum, optic nerve hypoplasia with pituitary or neurological disease, anterior lenticonus with Alport syndrome, and small spherical lens with microspherophakia syndromes.
• Describe the emergency clinician’s first actions, the investigations best left to an eye specialist, and a safe referral handover.

1. How to think about congenital eye findings

A congenital ocular anomaly is a structural or functional difference that develops before birth. It may be isolated, part of a genetic syndrome, related to maternal or fetal illness, or one feature of a broader developmental problem. A finding may be present at birth or become visible only as the eye grows. Laterality matters: a unilateral lesion often suggests a localized developmental difference, while bilateral or multiple anomalies raise concern for a genetic or syndromic cause, but neither pattern proves an etiology.

The developing eye is built from several interacting tissues. The optic cup and stalk form the neural retina, retinal pigment epithelium and optic nerve; the lens forms from surface ectoderm; periocular mesenchyme contributes to the cornea, sclera, uvea, vessels and orbit. The embryonic optic fissure normally closes during early development. Incomplete closure can leave a typical inferonasal coloboma of the iris, ciliary body, choroid, retina or optic disc. Developmental timing and tissue involvement help explain why two children with the same broad label can have very different vision and associated findings.

Classify what you see before naming a syndrome: which tissue is abnormal; one or both eyes; stable or changing; clear or opaque; visual axis affected or spared; isolated or multiple; visual function preserved or impaired; and any systemic clues. A visible difference may be cosmetic, but a small pupil-covering lid, lens opacity or macular/optic nerve abnormality can interfere with vision while the child appears otherwise well.

1.1 First-pass triage: findings that change urgency

2. Initial assessment in emergency and general practice

2.1 History

• Timing and progression: present at birth or newly noticed; stable, progressive or sudden; photographs showing a white pupil or asymmetry; previous eye examinations or surgery.
• Visual function: fixation and following, response to faces, whether the child reaches accurately, closes one eye, holds objects near, tilts the head, has nystagmus, light sensitivity, night blindness, or difficulty at school. Test each eye separately when possible because the better eye can conceal loss in the other.
• Pregnancy and neonatal history: prematurity, birth weight, delivery injury, neonatal intensive care, oxygen exposure, congenital infection, maternal medicines or illnesses, and family history of similar eye or systemic conditions. Ask neutrally; history alone cannot establish causation.
• Systemic review: hearing loss, blood in urine, kidney disease, unusual stature or joints, heart murmur, clefting, abnormal ears, facial asymmetry, genital/urinary differences, growth failure, hypoglycaemia, jaundice, developmental delay or seizures.
• Acute change: pain, redness, photophobia, discharge, headache/vomiting, trauma, proptosis, a new pupil difference or sudden change in vision.

2.2 Examination

1. Observe before touching: general appearance, facial symmetry, head posture, lid height, spontaneous fixation, alignment, nystagmus, proptosis, corneal clarity and whether one eye is smaller or larger.
2. Visual behaviour/acuity: age-appropriate acuity chart in each eye separately when possible; in preverbal children document fixation, following and response to occlusion. Use caregiver-held occlusion if needed and prevent peeking. A failed or unreliable test in a child with an abnormal appearance merits a full eye examination.
3. Pupils and red reflex: compare pupil shape, position and reaction. Perform a red-reflex comparison in a dim room with a direct ophthalmoscope, keeping the child and examiner at a suitable distance. A dull, white or asymmetric reflex is abnormal; do not wait for a second photograph.
4. Alignment and motility: assess corneal light reflex, cover-uncover test if trained, extraocular movements and head posture. A facial fold can mimic crossing, but clinical alignment testing is needed.
5. Lids, lashes, puncta and surface: inspect for coloboma, ptosis, entropion, lashes touching the cornea, exposure, punctal absence, tearing, discharge, ulceration and fluorescein staining when appropriate.
6. Anterior segment: note corneal size/clarity, anterior-chamber depth, iris/pupil shape and lens reflex. A cloudy cornea or visible lens displacement warrants urgent ophthalmic care.
7. Fundus and systemic checks: dilated retinal/optic nerve assessment, intraocular pressure, ultrasound or genetic/endocrine tests are generally specialist-directed. Do not press on an eye if penetrating injury is possible. Record what you could not examine.

Do not use numeric corneal diameter or cup-to-disc cut-offs as a diagnosis outside a complete eye examination. Infant anatomy changes with age, measurement technique matters, and several congenital conditions resemble one another. Avoid starting steroid drops, dilating drops, pressure-lowering medicines or a surgical plan from a photograph or slide alone.

3. Congenital eyelid and lash anomalies

3.1 Congenital ptosis

Ptosis is a drooping upper eyelid. Most simple congenital ptosis reflects abnormal development or function of the levator palpebrae superioris, but a low lid can also occur with nerve palsy, muscle disease or a wider syndrome. The supplied deck distinguishes simple ptosis, ptosis with superior rectus weakness, ptosis within blepharophimosis syndrome, and congenital synkinetic (Marcus Gunn jaw-winking) ptosis. In jaw-winking ptosis the lid elevates or retracts with jaw movement, such as chewing or sucking.

Measure and document lid position and levator excursion if trained; compare pupils, eye movements, refractive risk, corneal reflex and head posture. Look for a chin-up posture, forehead effort, amblyopia, astigmatism or strabismus. Ask if the lid blocks the visual axis when the child looks straight ahead or down. A child may compensate by extending the neck; this is a clue, not proof of normal vision. The BPES pattern combines blepharophimosis (short horizontal lid opening), ptosis, telecanthus and epicanthus inversus. Congenital ptosis may also accompany superior rectus weakness or other ocular dysinnervation.

Management: urgent or prompt paediatric ophthalmology is indicated if the pupil is covered, vision is reduced, there is a significant head posture, anisometropia/amblyopia risk, abnormal motility or an unclear diagnosis. Treatment may include spectacles/amblyopia therapy and eyelid surgery, but the timing and procedure depend on visual development, levator function, corneal protection and associated disease. Do not wait for routine cosmetic review when the visual axis is obstructed. Newly acquired ptosis, unequal pupils, double vision, headache, weakness or restricted movement is an emergency neurological/ophthalmic presentation until explained.

3.2 Eyelid coloboma

An eyelid coloboma is a full-thickness notch or gap in the lid margin caused by incomplete tissue formation. The slide deck depicts a triangular defect, often near the nasal side and commonly involving the upper lid; actual location and size vary. It may be isolated or associated with craniofacial and ear anomalies, including syndromic presentations. Assess lid closure, blink, corneal exposure, tearing, conjunctival damage and visual axis. A large defect can leave the cornea uncovered, dry and ulcerated.

Protect an exposed cornea with preservative-free lubrication and a moisture chamber while arranging urgent ophthalmology/oculoplastics care. If an epithelial defect, opacity, pain, poor closure or infection is present, treat as urgent. Repair planning is specialist-led because it must restore lid function and protect the cornea without inducing amblyopia or abnormal lid contour. Also examine the rest of the face, ears and globe; a coloboma is a clue to check for other malformations.

3.3 Epicanthus and telecanthus: appearance versus true strabismus

Epicanthal folds are skin folds at the medial canthus. They are a normal facial feature in many children and may make the eyes appear crossed by hiding nasal sclera. This apparent inward turn is pseudoesotropia; it is not proof that the visual axes are misaligned. Telecanthus means increased distance between the medial canthi while the interpupillary distance may remain normal; it can occur alone or in BPES and other craniofacial conditions. Compare corneal light reflexes and use cover testing when possible. If the eyes truly deviate, the red reflex is abnormal, visual behaviour is poor or the examination is uncertain, refer. A benign facial appearance does not exclude a separate strabismus.

3.4 Epiblepharon, congenital entropion and distichiasis

Epiblepharon is a horizontal fold of skin and orbicularis that pushes lashes inward, often along the lower lid. It differs from entropion: in epiblepharon the lid margin itself is normally positioned but the fold rotates the lashes; in entropion the lid margin turns inward. Mild epiblepharon may improve as the face grows, as the slide notes, but lashes rubbing the cornea can cause tearing, photophobia, epithelial staining, abrasion or scarring. Examine the cornea and refer if symptoms or staining are present.

Congenital entropion is rare and the lid margin turns inward from birth; microphthalmia or other lid anomalies may coexist. Corneal abrasion or ulceration makes it urgent. Distichiasis is an extra row of lashes arising from meibomian-gland openings; the lashes may point posteriorly and rub the cornea. Lubrication can reduce friction while arranging ophthalmology. Corneal damage, persistent pain, photophobia or reduced vision needs same-day review. Lash removal or lid procedures are specialist treatments because recurrence and scarring are possible.

3.5 Small, absent or fused lids; euryblepharon

Microblepharon means abnormally small eyelids and may accompany microphthalmia or anophthalmia. Ablepharon describes virtually absent eyelids. Cryptophthalmos is a rare malformation in which eyelid structures fail to form normally and skin may extend continuously from brow to cheek over the globe; it can occur with Fraser syndrome and other anomalies. These findings need early specialist care for globe assessment, corneal protection, socket development, and syndromic evaluation.

Euryblepharon is a horizontally widened palpebral fissure, often with lateral canthal malposition or lateral ectropion. Assess exposure, tearing, incomplete closure, corneal staining and facial nerve function. A threatened or ulcerated cornea requires urgent lubrication, protection and ophthalmology. The source deck’s slide called “Anophthalmos” signals absent or extremely small globe; distinguish true anophthalmia from severe microphthalmia with imaging and specialist evaluation rather than by surface appearance alone.

4. Corneal size, shape and congenital opacity

4.1 Megalocornea and microcornea

Megalocornea is an unusually large cornea present from birth or early life. A clear, non-progressive enlarged cornea with a normal-looking globe may represent isolated megalocornea, but the emergency clinician must first exclude congenital glaucoma. Glaucoma can also enlarge the cornea, often with haze, tearing, photophobia, blepharospasm, elevated pressure or Haab striae. Measure both eyes and compare with age-appropriate norms through an ophthalmology service; the exact diameter thresholds in the slide deck should not be used as a stand-alone rule.

Microcornea is a cornea smaller than expected. It may be an isolated finding, accompany microphthalmia or nanophthalmos, or form part of anterior-segment dysgenesis. Refraction, lens position, anterior-chamber anatomy, intraocular pressure and posterior segment must be assessed. Significant refractive error, amblyopia or glaucoma may coexist. A small cornea does not necessarily mean the whole eye is small, and the distinction requires biometry.

4.2 Cornea plana and ectatic cornea

Cornea plana is an abnormally flat cornea, sometimes with microcornea and marked refractive error including astigmatism or hyperopia. The external appearance may be subtle while visual blur is substantial. It needs a complete refraction, assessment for associated anterior-segment findings and family/genetic review if bilateral or syndromic.

The deck labels a rare protruding corneal condition “keractasia.” A protruding or thinned congenital cornea is an ectatic/anterior-staphylomatous appearance until assessed; terminology can vary and a single slide label cannot define the lesion. Exclude congenital glaucoma, congenital infection, previous intrauterine perforation, trauma and other anterior-segment malformation. A very thin or protruding cornea is vulnerable to rupture. Avoid pressure, rubbing or unnecessary manipulation; protect the eye and obtain specialist review. Sudden pain, haze, leakage or reduced vision is an emergency.

4.3 Congenital cloudy cornea: treat as a sign, not a diagnosis

Clouding at birth can be caused by several different disorders. The deck lists sclerocornea, tears in Descemet membrane, ulceration, metabolic disease, a posterior corneal defect, endothelial dystrophy and dermoid. Add Peters anomaly, congenital glaucoma, congenital infection, birth-related injury and other anterior-segment dysgenesis to the working differential. These conditions have different prognoses and management; do not reassure based on appearance alone.

Check red reflex, fixation and pupil, but do not force the lids or press on the globe. A newborn with corneal haze should be seen urgently by paediatric ophthalmology; the team may need examination under anaesthesia, pressure and diameter measurement, corneal imaging, ultrasound, microbiology or metabolic testing. Lubricate and protect the surface if advised; avoid empiric steroid drops before infection and glaucoma have been considered.

5. Iris, pupil and uveal tract anomalies

5.1 Heterochromia of the iris

Heterochromia iridis is a difference in colour between the two irides; sectoral heterochromia is a different-coloured segment in one iris. It can be congenital and isolated. Document pupil shape, vision, cornea, lens, iris architecture and whether the difference is stable. New heterochromia, a smaller pupil with mild ptosis, facial sweating asymmetry, inflammation, trauma or a mass requires assessment for acquired causes such as Horner syndrome, uveitis, injury or other disease. Congenital Horner syndrome after birth trauma and acquired Horner syndrome can need paediatric evaluation; do not label a new pupil asymmetry cosmetic.

5.2 Corectopia and polycoria

Corectopia is an eccentric pupil. A small shift can be incidental, but marked displacement may accompany anterior-segment dysgenesis, iris/corneal adhesion, ectopia lentis et pupillae, coloboma or trauma. Test light reaction, red reflex, visual acuity and anterior-chamber configuration. Sudden pupil displacement or a painful red eye is not a benign congenital finding until evaluated.

Polycoria is the appearance of more than one pupil. True multiple pupils with functioning sphincters are uncommon; iris holes, transillumination defects or an irregular pupil can mimic polycoria. Multiple openings may cause glare, photophobia, monocular diplopia or reduced vision. A full eye exam distinguishes the structural finding, checks the lens and pressure, and determines whether any treatment is needed. Do not assume each dark spot is a functional pupil.

5.3 Congenital aniridia and anterior-segment dysgenesis

Aniridia means marked underdevelopment or near absence of iris tissue. Complete absence is unusual; a residual peripheral iris rim may remain. Infants may have photophobia, nystagmus or reduced fixation from foveal hypoplasia. Later complications include glaucoma, cataract, corneal surface disease, limbal stem-cell deficiency and progressive vision loss. A child with aniridia needs ongoing ophthalmology even if early acuity appears useful.

Many cases involve PAX6; some are inherited and some occur de novo. In an infant with apparently sporadic bilateral aniridia, evaluation for a deletion involving both PAX6 and adjacent WT1 is important because the WAGR spectrum includes Wilms tumour risk, genitourinary or kidney abnormalities and neurodevelopmental differences. Refer to genetics and paediatrics promptly; oncology/nephrology teams determine the appropriate renal tumour surveillance plan for the child’s genotype and local protocol. Do not use absence of family history, normal external appearance or one normal scan to rule out the syndrome.

Corectopia and iris hypoplasia can also occur with Axenfeld-Rieger spectrum and other anterior-segment dysgenesis, sometimes with dental, facial, umbilical or systemic features. Elevated pressure may not produce obvious symptoms in a young child. Document and refer for gonioscopy, optic nerve assessment and long-term pressure surveillance.

5.4 Persistent pupillary membrane

A persistent pupillary membrane is a remnant of the fetal vascular tissue in front of the lens. Fine strands may attach to the iris collarette and cross the pupil. Many are thin and do not affect sight; a dense central membrane can reduce the red reflex, block the visual axis or contribute to amblyopia. Differentiate it from cataract, retrolental membrane in persistent fetal vasculature and leukocoria. An abnormal reflex or poor fixation calls for urgent ophthalmology. Observation, optical treatment or surgery is selected by the specialist according to visual impact.

5.5 Uveal coloboma

Coloboma is missing tissue. A typical uveal coloboma follows the inferonasal embryonic fissure and may involve the iris, ciliary body and choroid together or separately. An iris coloboma often looks like a keyhole pupil extending downwards; a posterior coloboma may be invisible externally. Atypical colobomas occur in other positions and may be incomplete. A small iris-only coloboma may mainly cause photophobia or cosmetic concern, while a large chorioretinal or optic nerve coloboma can cause reduced vision, field loss, nystagmus, strabismus, amblyopia or retinal detachment.

Perform a dilated examination of both eyes and assess refraction, alignment, macula and optic nerves. Counsel families to seek urgent care for new flashes, floaters, curtain-like field loss, sudden blur or pain. Consider genetic assessment and a broader exam for other congenital anomalies; CHARGE and other syndromes may include coloboma, hearing/ear, heart, airway, growth or genital findings. Ask about similarly affected relatives; examination of parents may clarify inheritance. Provide clear advice that a normal-looking iris does not exclude a posterior coloboma.

6. Congenital crystalline-lens anomalies

Abnormal lens shape or position can reduce vision, produce high refractive error, create a white pupil, raise pressure or damage the cornea. Children may not report blur. Check visual behaviour, red reflex, pupil, anterior-chamber depth and lens position; a complete assessment uses slit-lamp examination, cycloplegic refraction, pressure measurement and sometimes ultrasound or imaging. Acute painful lens displacement is an emergency.

6.1 Lenticonus and lentiglobus

Lenticonus is a cone-shaped projection of the anterior or posterior lens surface. Anterior lenticonus is classically bilateral and strongly associated with Alport syndrome, a collagen disorder that also affects kidneys and hearing. Ask about haematuria, proteinuria, kidney failure in relatives and sensorineural hearing loss; arrange paediatric/nephrology and audiology assessment when suspected. Retinal flecks and posterior polymorphous corneal dystrophy are also described in Alport syndrome. The oil-droplet red reflex or irregular retinoscopy may be a clue, but confirmation is specialist-led. The slide’s quoted proportion is not a universal frequency estimate.

Posterior lenticonus is commonly unilateral and may be sporadic; a focal posterior lens bulge, thinning of the posterior capsule or posterior opacity can cause progressive blur, anisometropia or amblyopia. Lentiglobus is a more generalized hemispherical lens curvature, often posterior and sometimes associated with an opacity. Refraction, visual acuity and visual-axis clarity guide specialist management; treatment may range from spectacles to lens surgery, with amblyopia treatment and long follow-up as needed.

6.2 Lens coloboma

The deck uses “lens coloboma” for a notch at the inferior lens equator with absent or abnormal zonular fibres. Unlike a classic uveal coloboma, this is usually a notched contour from focal zonular weakness rather than a missing layer caused by fissure non-closure. The lens can tilt or subluxate and induce astigmatism, anisometropia or amblyopia. Look for a crescent-shaped equatorial defect with dilation during specialist examination. Assess for iris or choroidal coloboma and systemic/genetic features if multiple anomalies are present.

6.3 Microspherophakia and ectopia lentis

Microspherophakia is a small, rounded lens, often with weak or lax zonules. It can cause lenticular myopia, shallow anterior chamber, pupillary block, secondary angle-closure glaucoma and lens subluxation or dislocation into the anterior chamber. The slide lists isolated familial cases, Weill-Marchesani syndrome, Marfan syndrome, hyperlysinaemia and congenital rubella among reported associations; it also notes Peters anomaly and ectopia lentis et pupillae as ocular associations. These are uncommon and the exact differential depends on phenotype and testing. Weill-Marchesani clues include short stature, brachydactyly and stiff joints. Marfan clues include tall habitus, long limbs, chest/spine features and cardiovascular disease. Homocystinuria is another important systemic cause of ectopia lentis and needs metabolic evaluation.

A suddenly painful red eye, high pressure, shallow chamber, corneal touch by the lens, headache/vomiting or sudden vision loss is an immediate ophthalmic emergency. Do not attempt to reposition the lens or dilate a child without specialist direction. Chronic or stable displacement still needs ophthalmology, refraction, pressure and systemic workup. Preventing amblyopia and monitoring the fellow eye are part of care.

7. Retina, choroid and macula

7.1 Chorioretinal coloboma

A choroidal/chorioretinal coloboma appears as a pale, excavated area where retinal pigment epithelium, choroid and sometimes retina are absent or underdeveloped. A typical lesion is inferior and may extend from the disc toward the periphery; it can be unilateral or bilateral. A central/macular lesion can greatly reduce acuity. Peripheral margins may predispose to retinal breaks or detachment, so explain that new flashes, floaters, a curtain or sudden decline in vision requires emergency review. Routine follow-up should document lesion location, macular involvement, refraction, visual function and retinal status.

7.2 Macular aplasia, hypoplasia and coloboma

The macula is responsible for fine central detail. Foveal/macular hypoplasia means incomplete development of this central retinal region; severe aplasia or coloboma can cause poor central acuity, nystagmus, strabismus and photophobia. Causes include albinism, aniridia, PAX6-related disease, prematurity and other developmental conditions. Use age-appropriate acuity and fixation testing; OCT and electrophysiology can help the specialist characterize the structure and function. Do not assume reduced visual behaviour is due solely to refractive error.

Retinal albinism may be associated with iris transillumination, reduced fundus pigment, foveal hypoplasia, nystagmus, refractive error, photophobia and abnormal optic-pathway routing. Provide refraction, low-vision and school support and discuss skin/eye sun protection where appropriate. Assess hearing, bleeding tendency or immune symptoms if the broader phenotype suggests a syndromic form; do not infer albinism from fundus appearance alone.

7.3 Congenital stationary night blindness, day blindness and Oguchi disease

Children with congenital night blindness may struggle in dim light despite reasonable daytime vision. Congenital day blindness or cone dysfunction can cause marked photophobia, colour-vision difficulty, nystagmus and reduced acuity. Oguchi disease is a rare form of congenital stationary night blindness; a golden or metallic fundus appearance may change after prolonged dark adaptation (the Mizuo–Nakamura phenomenon). These conditions are usually non-progressive or slowly changing, but progression must be verified rather than assumed. Refer for retinal examination, refraction, family history, electroretinography and genetic assessment when available. Day/night vision complaints do not replace urgent evaluation for sudden loss or retinal detachment.

7.4 Congenital retinal cyst, detachment and vascular findings

The source deck names congenital retinal cyst and congenital retinal detachment without detailed management slides. A visible retinal cystic or detached configuration needs specialist imaging because differential diagnoses include inherited retinal disease, retinoschisis, coloboma-associated detachment, persistent fetal vasculature, trauma and retinoblastoma. Sudden or progressive loss, leukocoria, strabismus, nystagmus or a field defect is urgent. A child with a white reflex must be assessed for malignancy before a benign developmental diagnosis is accepted.

Other listed vascular findings include congenital retinal-vessel tortuosity and persistent hyaloid vessels. Some are incidental; others can accompany systemic or ocular disease. New visual loss, retinal haemorrhage, arterial occlusion or unexplained tortuosity merits specialist evaluation. Do not diagnose retinal vascular disease from a low-quality photograph alone.

8. Optic-disc and optic-nerve anomalies

8.1 Optic nerve hypoplasia

Optic nerve hypoplasia (ONH) is underdevelopment of optic nerve fibres. One or both nerves may be small; vision ranges from near-normal to severe impairment. Nystagmus, poor fixation, strabismus or a small pale disc may be present. The double-ring sign is a small optic disc with a peripapillary ring, but absence of this sign does not rule out ONH. The slide deck calls ONH a major paediatric cause of visual loss; ranking and prevalence vary between populations, so use the anatomy and clinical need rather than a league-table claim.

ONH is not only an eye diagnosis. It may coexist with pituitary hormone deficiencies, septum pellucidum or other midline brain differences, developmental delay, seizures or cerebral palsy. All affected children need comprehensive paediatric/endocrine and developmental assessment with ongoing follow-up; a normal brain MRI does not rule out endocrine dysfunction. Recurrent or unexplained hypoglycaemia, prolonged neonatal jaundice, poor growth, temperature instability, excessive thirst/urination or lethargy heightens concern. Promptly refer to paediatrics/endocrinology and ophthalmology. MRI and specific laboratory testing are selected by the multidisciplinary team.

8.2 Optic disc coloboma and papillorenal association

Optic disc coloboma is an excavation or incomplete formation of the nerve head, often inferonasal, and may be unilateral or bilateral. It can occur with iris or chorioretinal coloboma. Bilateral or syndromic cases merit genetic and systemic evaluation. A particularly important association is papillorenal (renal-coloboma) syndrome involving PAX2, where optic nerve anomalies coexist with renal hypodysplasia or other kidney disease. Ask about renal history, check blood pressure and arrange paediatric/genetic/nephrology review; a normal urine history does not rule out structural kidney disease.

8.3 Morning glory disc anomaly

Morning glory disc anomaly is a congenital funnel-shaped excavation of the posterior globe involving an enlarged optic disc. The disc can look like a flower because vessels radiate from its margin; peripapillary pigment or glial tissue may be present. Vision can be reduced, and retinal detachment, strabismus or amblyopia may occur. The anomaly may be sporadic and often unilateral, but associated midline craniofacial and cerebrovascular abnormalities, including Moyamoya in some patients, have been reported. Refer for ophthalmic confirmation and broader neurological/vascular evaluation guided by symptoms and specialist assessment. New weakness, transient neurological symptoms, severe headache or acute vision change requires emergency care.

8.4 Optic disc pit

An optic pit is a small congenital depression in the optic nerve head. It is often asymptomatic, but fluid can extend under the macula and cause serous macular detachment, metamorphopsia or central blur. Sudden or progressive central visual change warrants urgent retinal/ophthalmic review. A child with an incidental pit still needs follow-up and caregiver advice about symptoms.

8.5 Megalopapilla, tilted disc, pigmentation, drusen and nerve-fibre variants

Megalopapilla is an unusually large optic disc, often bilateral, and may have a large cup-to-disc ratio. It can be mistaken for glaucoma. Glaucoma assessment depends on pressure, optic-nerve rim, disc shape, retinal nerve-fibre layer, visual fields when possible and change over time; cup size alone is not diagnostic. Refer for baseline and follow-up rather than labeling a child with glaucoma or dismissing a suspicious disc.

Congenital tilted disc syndrome may produce an oblique, oval nerve head with retinal-vessel situs inversus, an inferonasal conus with inferonasal retinal pigment epithelium and choroidal thinning, and myopic astigmatism. It can cause visual-field or refractive findings that resemble acquired neurological disease. Compare both eyes and correlate with refraction, imaging and symptoms. True disc swelling, headache, vomiting, diplopia or focal neurological signs must still be treated as urgent; do not attribute them to a tilted disc without specialist review.

Congenital optic-disc pigmentation may create a gray disc appearance from melanin. Optic disc drusen may be buried in children and can mimic papilledema. Medullated nerve fibres appear as white feathery patches extending from the disc along the retinal nerve-fibre layer. These may be incidental, but visual function, refraction and other disc features need documentation. An abnormal-looking nerve head should be compared with acuity, pupils, pressure, field/neurological symptoms and previous images whenever available.

8.6 Prepapillary loop and Bergmeister papilla

A prepapillary vascular loop is a vessel that arches forward from the optic disc into the vitreous. Bergmeister papilla is residual glial tissue from the fetal hyaloid system on the disc. Both can be incidental and unilateral, but vascular loops rarely associate with vitreous haemorrhage or an arterial event. Sudden floaters, haemorrhage or loss of vision is urgent; stable incidental findings are managed by an ophthalmologist according to retinal appearance and risk.

9. Vitreous and persistent fetal vasculature

The fetal hyaloid circulation normally regresses as the eye develops. Persistent hyaloid artery or broader persistent fetal vasculature (PFV; historically persistent hyperplastic primary vitreous) occurs when fetal vascular tissue fails to regress. It is often unilateral, may be associated with microphthalmia and can produce leukocoria. The anterior form may involve a retrolental membrane, elongated ciliary processes, cataract, shallow anterior chamber or glaucoma. The posterior form may have a vitreous stalk, retinal folds or detachment while the lens remains relatively clear. Mixed forms affect both segments.

PFV is a diagnosis of exclusion in a white-pupil child because retinoblastoma is life-threatening. Other causes of leukocoria include cataract, ROP-related detachment, Coats disease and toxocariasis. The assessment may require dilated examination, ultrasound and specialist imaging; do not biopsy or manipulate the globe. Bilateral disease or atypical features should prompt evaluation for a broader genetic or systemic condition. Management varies with visual potential and may involve observation, amblyopia therapy or complex surgery. The source slide says persistent hyaloid artery is frequently seen in premature infants; a persistent vessel can be visible in some infants, but do not treat that percentage as a universal prevalence estimate or equate a tiny remnant with sight-threatening PFV.

10. Lacrimal and orbital anomalies

10.1 Congenital lacrimal drainage problems

Congenital obstruction or absence of the puncta/canaliculi, congenital nasolacrimal duct obstruction and dacryocystocele can cause tearing or discharge. A watering eye with clear cornea and no photophobia may be a simple drainage problem, but assess the cornea and globe first. The deck contains a slide labeled “congenital dacryocystitis”; dacryocystitis is infection/inflammation of the lacrimal sac, not a harmless structural birth variant. A painful red medial-canthus swelling, fever, purulence or an unwell neonate needs urgent systemic assessment. A bluish medial-canthal swelling in an infant can be a dacryocystocele; bilateral cysts may extend into the nose and impair breathing. Do not delay care if feeding or respiration is affected.

Congenital nasolacrimal duct obstruction often improves during infancy. A clinician can teach correct Crigler massage and reserve topical antibiotics for significant mucopurulent discharge or secondary infection; drops do not open the duct. Persistent cases may need probing or another specialist procedure. Photophobia, corneal haze, enlarged globe, blepharospasm or reduced fixation suggests glaucoma or another diagnosis rather than uncomplicated obstruction.

10.2 Anophthalmia, microphthalmia and orbital development

Anophthalmia is absence of a visible globe; microphthalmia is a markedly small eye. Apparent absence may actually be severe microphthalmia, a small malformed globe or cryptophthalmos. These conditions can occur alone or with coloboma, a cyst, brain/facial anomaly, cardiac/renal findings or a genetic syndrome. Confirm anatomy with specialist examination and imaging; assess vision, cornea, socket, orbit and the fellow eye.

The immediate priority is to protect the seeing eye and support socket/orbital development. Management can involve an ocularist, conformer or prosthesis, orbital expansion and reconstructive care as the child grows. Explain that a prosthesis improves appearance and supports socket development but does not restore sight to an absent or severely malformed eye. Offer genetic counselling and multidisciplinary support. Avoid casual prognostic statements before a full evaluation.

Other orbital/congenital facial findings in this structural territory include colobomatous cyst, dermoid/choristoma, telecanthus and anomalies associated with craniofacial syndromes. A rapidly enlarging mass, proptosis, painful restricted movement, fever or an abnormal pupil is urgent and should not be assumed congenital/benign. Assess the airway, hearing and other cranial structures when the child has a syndromic appearance or nasal/orbital lesion.

11. Syndrome clues and whole-child assessment

Do not assume that a normal family history rules out inherited disease: new variants, recessive inheritance, variable expression and unrecognized mild findings are common. Conversely, family history alone does not prove genetic causation. Explain the purpose and limits of genetic testing, keep the family involved, and refer counselling decisions to qualified genetics services.

12. Emergency management and referral handover

1. Stabilize the child first: airway, breathing and circulation; treat sepsis, hypoglycaemia, trauma or neurological emergency according to hospital protocol.
2. Protect the eye: avoid pressure and manipulation if rupture is possible; use a rigid shield for suspected open globe. For exposed cornea, lubricate and protect while arranging urgent eye care.
3. Assess vision and pupils: record acuity or visual behaviour for each eye, red reflex, pupil shape/reaction, corneal clarity, eye movements and lid position. State if a test could not be performed.
4. Do not delay urgent referral for nonessential testing: leukocoria, cloudy/enlarged cornea, suspected congenital glaucoma, acute lens dislocation, corneal ulcer/exposure and retinal-detachment symptoms need ophthalmology first. Ultrasound, OCT, ERG, genetic tests and imaging are specialist-directed.
5. Look beyond the eye: check growth, hydration, blood glucose when indicated, dysmorphic features, hearing, renal symptoms, congenital heart clues, genital/urinary differences and neurological development. In a child with suspected ONH or aniridia, arrange the appropriate endocrine/genetic team.
6. Communicate a specific referral: age, onset, laterality, visual function, red reflex, corneal status, pupil, suspected diagnosis, pain/systemic signs, family history, gestational age, medicines and the action already taken. Confirm where and when the child will be seen; provide the caregiver with a return route.

13. Applied cases

Case 1: A drooping lid in a young infant

A 4-month-old has unilateral ptosis and tilts the chin up. The lid margin covers part of the pupil. The child fixes with the fellow eye and does not track reliably with the affected eye. Treat this as a risk to visual development, not a cosmetic concern. Document both eyes, protect the cornea, and arrange prompt paediatric ophthalmology for acuity, refraction, amblyopia and lid assessment. Sudden onset, pupil asymmetry or abnormal movement would require immediate neurological evaluation as well.

Case 2: Cloudy eyes and tearing

A newborn has bilateral tearing and a hazy cornea; the lids squeeze shut under light. CNLDO alone should not cause this combination. Congenital glaucoma and corneal dysgenesis are urgent possibilities. Avoid pressure and unsupervised drops, document red reflex/visual behaviour if possible, and arrange immediate eye assessment and paediatric evaluation.

Case 3: A white reflex in one eye

A caregiver shows a flash photograph with a white pupil. The child appears comfortable and tracks objects. A normal bedside appearance does not exclude retinal tumour, PFV or cataract. Do not wait for another photograph or schedule routine follow-up. Refer urgently for dilated eye examination and imaging.

Case 4: Aniridia at birth

A newborn has bilateral iris hypoplasia and nystagmus. Arrange ophthalmology and paediatric/genetics review, confirm vision-threatening associated features, and consider molecular testing for PAX6 and a neighbouring WT1 deletion. The family needs advice about eye follow-up and possible renal tumour surveillance based on the genetic result. Do not wait for Wilms tumour symptoms.

Case 5: A cloudy cornea with high pressure not yet measured

A 2-month-old has a larger-looking eye with corneal haze. Corneal clouding may arise from congenital glaucoma, Peters anomaly, sclerocornea, birth injury, infection or metabolic disease. The correct response is urgent specialist examination; a slide threshold or single external measurement cannot safely distinguish these conditions.

Case 6: An optic-nerve anomaly and poor growth

A toddler with nystagmus has a small optic nerve head and poor growth. Suspect ONH with possible pituitary dysfunction. Refer for comprehensive endocrine and developmental evaluation even if the child has not had seizures or an MRI abnormality. Ask about hypoglycaemia, prolonged jaundice, temperature instability and abnormal thirst/urination.

Case 7: Lens abnormality with systemic clues

A school-aged child has progressive blur, anterior lenticonus and relatives with kidney failure/hearing loss. Think Alport syndrome and coordinate ophthalmology, nephrology and audiology. A separate child with microspherophakia, severe pain, a shallow chamber and a displaced lens needs immediate treatment for possible pupillary block/angle-closure glaucoma.

14. Self-test

1. What distinguishes a true coloboma from an eyelid fold that only creates the appearance of a gap?
2. Which ptosis finding makes referral time-sensitive for visual development?
3. Why must an infant with a cloudy, enlarged cornea be assessed urgently?
4. Name three possible causes of congenital corneal opacity besides congenital glaucoma.
5. Which systemic syndrome is classically associated with anterior lenticonus?
6. Why should apparently sporadic aniridia lead to consideration of WT1 testing?
7. What should an emergency clinician do when a caregiver reports leukocoria even if the child seems well?
8. How can optic nerve hypoplasia affect systems beyond sight?
9. What acute symptoms can indicate retinal detachment in a child with chorioretinal coloboma?
10. Why is persistent fetal vasculature not accepted as the diagnosis of a white pupil before further assessment?
11. What separates epiblepharon from entropion?
12. Which complication can occur when microspherophakia pushes the lens forward?

Answers

1. A coloboma is a true full-thickness developmental tissue defect; an epicanthal skin fold can hide nasal sclera and mimic a gap or crossed eye without structural absence.
2. The lid covers or threatens the pupil, causes a head posture, or is associated with poor vision, amblyopia risk, refractive error or abnormal motility.
3. Congenital glaucoma can stretch and permanently damage the developing eye; other corneal developmental disease and infection also threaten vision.
4. Peters anomaly, sclerocornea, endothelial dystrophy, Descemet membrane injury, congenital infection, dermoid or metabolic/storage disease are examples.
5. Alport syndrome, with renal and hearing findings.
6. A deletion can include both PAX6 and adjacent WT1, creating WAGR-spectrum Wilms tumour and genitourinary/kidney risk.
7. Arrange urgent paediatric ophthalmology assessment; do not observe, wait for another photograph or reassure from a single normal-looking examination.
8. Endocrine/pituitary deficiency, midline brain abnormalities, developmental delay, seizures or other neurological issues may coexist.
9. New flashes, floaters, a curtain or field defect, sudden blur or vision loss.
10. Retinoblastoma and other sight-threatening causes can look similar; specialist examination and imaging are needed to exclude them.
11. In epiblepharon the lid margin remains normally positioned while a skin-muscle fold turns lashes inward; entropion is inward rotation of the lid margin.
12. Pupillary block or secondary angle-closure glaucoma, as well as myopia, lens subluxation or dislocation.

15. Key points for emergency-medicine students

• Do not equate “congenital” with “safe.” Abnormal red reflex, leukocoria, cloudy/enlarged cornea and visual-axis obstruction require urgent action.
• Measure or document visual behaviour one eye at a time. A child can compensate with the better eye and may not complain.
• Protect exposed cornea, avoid pressure on a potentially open globe, and avoid empiric steroid or mydriatic drops until the cause is assessed.
• Aniridia may signal WAGR-spectrum disease; optic nerve hypoplasia may signal pituitary/brain disease; anterior lenticonus may signal Alport syndrome.
• Distinguish facial appearance variants from structural disease with examination, but refer if alignment, red reflex or vision is uncertain.
• Coloboma can involve iris, ciliary body, choroid, retina, macula or optic nerve; the posterior lesion may be invisible externally and retinal detachment can occur.
• Lens shape and position defects can produce amblyopia or acute glaucoma; painful sudden change is an emergency.
• Congenital lacrimal obstruction may be benign, while dacryocystitis, fever, corneal haze or breathing difficulty is not.
• Make referral actionable: describe the exact finding, urgency, vision, cornea, red reflex and systemic features, and confirm the family has a route to care.

References and further reading

• Supplied teaching deck: Congenital anomalies in the eye (109-slide presentation).
• National Eye Institute: Coloboma, including types and genes.
• National Eye Institute: Anophthalmia and microphthalmia.
• American Association for Pediatric Ophthalmology and Strabismus (AAPOS): Coloboma; AAPOS: Genetic disorders clinical update—coloboma.
• AAPOS: Ptosis; AAPOS: Aniridia; AAPOS: Glaucoma in children.
• AAPOS: Persistent fetal vasculature; AAPOS: Optic nerve hypoplasia; AAPOS: Optic nerve pit.
• GeneReviews: PAX6-related aniridia, including evaluation for 11p13 deletions and WAGR spectrum.
• GeneReviews: Alport syndrome and ocular findings; GeneReviews: Weill-Marchesani syndrome.
• American Academy of Ophthalmology EyeWiki: Morning glory anomaly; AAO EyeWiki: Optic nerve hypoplasia.
• Pediatric optic nerve hypoplasia: neuroimaging and endocrine assessment (MRI findings do not substitute for endocrine evaluation).
• Uganda Ministry of Health: Uganda Clinical Guidelines 2023 and MediGuide; apply current local neonatal, paediatric, ophthalmology and referral protocols.