Common Childhood Eye Disorders: Assessment, Emergencies and Management

Scope. This lesson expands all clinical subjects in the supplied 54-slide teaching deck into a practical study resource for emergency-medicine students. It covers bacterial, viral, allergic and neonatal conjunctivitis; vernal keratoconjunctivitis; refractive errors and refractive amblyopia risks; amblyopia; esotropia, exotropia and pseudo-strabismus; congenital nasolacrimal duct obstruction; chalazion; corneal abrasion; congenital cataract; congenital glaucoma; leukocoria; retinopathy of prematurity (ROP), including cicatricial disease; and childhood vision screening. Image-only slides are represented through the corresponding anatomy, examination and clinical examples. Dated or unsafe slide recommendations are identified and corrected using current guidance.

Learning objectives

• Perform a focused, age-appropriate eye assessment and recognize danger signs requiring urgent referral.
• Distinguish bacterial, viral, allergic and neonatal conjunctivitis, including sight-threatening gonococcal, chlamydial and herpetic disease.
• Describe childhood myopia, hyperopia, astigmatism and anisometropia, and explain how uncorrected refractive error can cause amblyopia.
• Classify amblyopia and strabismus, recognize true deviation versus pseudoesotropia or pseudoexotropia, and explain the role of early treatment.
• Assess tearing from congenital nasolacrimal duct obstruction while excluding congenital glaucoma and dacryocystitis.
• Manage the first steps for chalazion, hordeolum and corneal abrasion, and recognize when they need ophthalmology review.
• Recognize congenital cataract, congenital glaucoma, leukocoria and ROP as threats to visual development or life and sight.
• Describe childhood vision screening and the separate screening pathway for premature infants.

1. Why early recognition matters

Vision develops through childhood as the retina, optic pathways and visual cortex learn to process clear, aligned images from both eyes. A child may have a significant refractive error or unilateral amblyopia yet behave normally because the better eye compensates. The child may not know that the view is blurred or different from other people’s. Caregivers may notice squinting, turning the head, closing one eye in sunlight, sitting close to a screen, losing place while reading, poor depth judgement, bumping into objects or avoiding near work. Some children have no obvious outward sign.

Prompt correction matters because prolonged blur, eye misalignment or obstruction of the visual axis can disrupt visual development. Early treatment of the cause and amblyopia can improve vision; delayed diagnosis may leave permanent reduction in acuity or binocular function. Conversely, painful red eye, corneal disease, neonatal infection, trauma, congenital glaucoma and leukocoria can threaten the eye within hours or days. The first clinical task is to decide whether the problem is a routine screening/refraction issue, a same-day eye problem or an immediate emergency.

2. Focused paediatric eye history and examination

2.1 History from the child and caregiver

• Onset and course: present from birth, intermittent, sudden, progressive, one eye or both; ask whether the caregiver has photographs showing a white pupil or eye turn.
• Visual behaviour: tracking and fixation in infants, response to faces or toys, closing one eye, head tilt or turn, sitting close, squinting, difficulty reading, school performance, falls or impaired depth judgement.
• Inflammation or injury: redness, discharge, itching, pain, photophobia, foreign-body sensation, chemical exposure, trauma, contact-lens use and rubbing.
• Birth and neonatal history: gestational age, birth weight, neonatal intensive-care stay, oxygen or cardiorespiratory support, infection, maternal infection screening and missed ROP appointments.
• Risk factors: prematurity, low birth weight, family history of strabismus, amblyopia, childhood cataract or glaucoma; developmental delay, genetic syndrome, diabetes, immunosuppression, eczema or asthma.
• Medicines and exposures: eye drops, traditional remedies, contact-lens solutions, previous antibiotics or steroids, and any newly started medicine associated with allergic or ocular symptoms.

2.2 Examination in a child who may not cooperate

1. Observe first: general appearance, face/head posture, eyelid position, spontaneous eye movements, fixation, tracking and whether the child uses one eye preferentially.
2. Visual acuity or visual behaviour: test each eye separately with an age-appropriate picture or letter chart when the child can cooperate. In infants, document fixation, following and response to occlusion. A normal binocular response does not rule out unilateral disease; cover each eye in turn.
3. Pupils and red reflex: compare pupils and reactions; test the red reflex in both eyes. A white, dull, asymmetric or absent reflex is abnormal. Leukocoria is urgent, not a routine observation.
4. Alignment and motility: inspect corneal light reflex, perform cover-uncover and alternate-cover tests if trained, assess versions in all directions, and look for limitation, nystagmus, abnormal head posture or diplopia.
5. External eye and lids: look for lid swelling, crusting, vesicles, punctal abnormality, proptosis, periorbital cellulitis and medial-canthus swelling.
6. Cornea and anterior segment: check clarity, surface staining with fluorescein when indicated, anterior-chamber depth, iris and lens. A cloudy enlarged cornea in a tearing, light-sensitive infant raises concern for congenital glaucoma.
7. Fundus and pressure: obtain a dilated fundus examination and intraocular pressure measurement when clinically indicated and safe, usually with an eye specialist. Avoid pressure or tonometry when open-globe injury is possible.

Do not force a prolonged examination if the child is distressed and the concern is time-critical. Document what was and was not assessed, protect the eye if injured, contact ophthalmology and arrange an examination under anaesthesia when the specialist considers it necessary.

2.3 Danger signs and disposition

3. Conjunctivitis in children

Conjunctivitis is inflammation of the conjunctiva, the thin membrane lining the eyelids and covering the anterior sclera. Redness and discharge are common, but marked pain, photophobia, reduced vision, corneal opacity, a fixed or abnormal pupil, proptosis or restricted movements are not features of uncomplicated conjunctivitis. Examine for corneal disease and foreign body before labeling a painful red eye as “pink eye.” Conjunctivitis is also a symptom pattern, not proof of bacterial infection.

3.1 Bacterial conjunctivitis

In older children, common pathogens include organisms such as Haemophilus influenzae, Streptococcus pneumoniae and Staphylococcus aureus. Purulent discharge raises the likelihood of bacterial disease but is not perfectly diagnostic. Many uncomplicated cases improve without antibiotics. When topical treatment is selected, choose an age-appropriate preparation using current local guidance, allergy history and local resistance patterns; the slide deck lists fluoroquinolone and aminoglycoside drops, but these are not interchangeable routine first-line drugs for every child.

Take a conjunctival specimen for Gram stain/culture or other testing when disease is hyperacute, severe, recurrent, associated with corneal involvement, unresponsive to appropriate treatment, in an immunocompromised patient or in a neonate. Copious purulence, rapid progression, corneal haze or ulceration suggests gonococcal disease or another serious infection. This requires urgent referral and systemic therapy; eye drops alone are not adequate treatment for gonococcal ophthalmia.

3.2 Viral conjunctivitis

Adenoviral conjunctivitis is highly contagious and may spread through hands, towels, shared surfaces or eye secretions. Watery discharge, follicles and a tender preauricular node support the diagnosis. Severe infection may cause chemosis, subconjunctival haemorrhage, pseudomembranes or punctate keratitis; corneal subepithelial infiltrates can blur vision after the acute red eye. The usual course is self-limited over one to several weeks, though timing varies.

• Use careful hand and face hygiene, avoid rubbing the eyes, do not share towels or pillows and clean frequently touched surfaces.
• Preservative-free lubricants and cool compresses can relieve discomfort.
• Do not prescribe antibiotics for uncomplicated viral disease. A topical antibiotic does not shorten adenoviral infection.
• Topical corticosteroids are reserved for selected severe corneal or membranous disease and must be supervised by an ophthalmologist because of risks including raised pressure, delayed healing and worsening unrecognized herpes infection.
• Return urgently if vision falls, pain becomes significant, photophobia develops or a corneal opacity appears.

3.3 Allergic conjunctivitis and VKC

In simple allergic conjunctivitis, itch is the most useful symptom. Watery eyes, mild papillary reaction, chemosis and eyelid oedema may occur. Both eyes are usually involved. Treatment includes allergen avoidance where possible, cool compresses, artificial tears and an age-appropriate topical antihistamine or dual-action antihistamine/mast-cell stabilizer. Oral antihistamines may help associated rhinitis but can worsen ocular dryness in some patients.

VKC is a more severe, recurrent allergic ocular-surface disease that commonly affects children and adolescents, especially in warm climates. It may be palpebral (large papillae on the upper tarsal conjunctiva), limbal (gelatinous thickening, sometimes with Horner–Trantas dots), or mixed. Intense itching, photophobia, tearing, foreign-body sensation, thick mucus and frequent blinking are typical. Chronic eye rubbing is associated with corneal ectasia including keratoconus. A shield ulcer, corneal plaque, reduced vision or severe photophobia requires urgent eye review because corneal scarring can permanently reduce vision.

Initial specialist-directed therapy may include allergen reduction, lubricants, cold compresses and topical antihistamine/mast-cell stabilizing drops. Persistent or severe VKC may require a topical calcineurin inhibitor such as ciclosporin or tacrolimus; a short course of topical steroid may be used for a significant flare under close ophthalmic supervision with pressure monitoring. Systemic immunosuppression or supratarsal steroid injection is specialist treatment for selected severe cases, not routine primary-care prescribing. The source slide lists multiple steroid strengths and immunosuppressants; these require eye-clinic oversight.

3.4 Neonatal conjunctivitis (ophthalmia neonatorum)

Conjunctivitis in a newborn can threaten the cornea and may signal disseminated infection. The timing offers clues but does not establish the organism: chemical irritation can occur early after prophylaxis; gonococcal disease often presents within the first several days; chlamydial disease commonly appears about 5–12 days after birth; HSV may present with vesicles or keratoconjunctivitis, and other bacteria can occur at any time. A newborn with red eyes or discharge needs prompt clinical assessment, particularly when there is copious purulence, lid oedema, corneal haze, vesicles, fever, lethargy or poor feeding.

The newborn should have corneal examination with fluorescein when appropriate, age-specific examination and systemic assessment. Testing can include Gram stain, bacterial culture, chlamydial and HSV molecular testing according to the suspected cause. Maternal and partner testing/treatment may be required for sexually transmitted pathogens. The source deck mentions povidone-iodine prophylaxis and several antibiotic regimens; prophylaxis policy differs by jurisdiction, and a prophylactic drop must never substitute for antenatal infection screening or treatment of a symptomatic newborn. Follow current Ugandan neonatal and STI guidance rather than copying slide doses.

4. Refractive errors in childhood

Refraction describes how the cornea and lens focus light relative to the retina. Children can accommodate strongly, which can conceal hyperopia during an ordinary non-cycloplegic assessment. A complete paediatric refraction often uses cycloplegic drops administered by a trained clinician so accommodation does not distort the measurement. Parents should not use cycloplegic drops without a prescription and guidance.

Warning signs include squinting, frequent blinking, frowning, rubbing the eyes, closing one eye, headache after near work, poor tolerance of reading, losing place, falling school performance, moving close to a screen and blurred vision when an older child can describe it. These features are not diagnostic on their own. Some children with anisometropia or bilateral hyperopia have no obvious behaviour change.

Use age-appropriate acuity charts and locally adopted referral thresholds. The numerical Snellen cut-offs in the slide deck for ages 3–4, 5 and over 5 are not universal prescribing thresholds; the chart, testing distance, cooperation and national screening protocol matter. A difference between eyes can be important even when both acuity readings seem acceptable. Cycloplegic refraction, binocular alignment, visual acuity and functional symptoms inform the prescription. Correcting accommodative esotropia often requires the full hyperopic correction measured after cycloplegia. Refraction and follow-up should be performed by an appropriately trained eye-care provider.

4.1 Myopia progression

Childhood myopia can progress as the eye grows. Encourage regular outdoor activity, healthy visual habits and appropriate breaks from prolonged close work. Correct the refractive error as prescribed; deliberate under-correction is not a safe strategy for slowing progression and may worsen visual function. Some children may be offered evidence-based myopia-control methods such as low-concentration atropine, specially designed optical lenses or orthokeratology under an eye specialist’s supervision. These approaches require discussion of benefits, limitations, adverse effects, cost, hygiene and follow-up. Cyclopentolate is used to temporarily relax accommodation for examination, not as standard long-term myopia-control treatment. Availability and approval vary.

5. Amblyopia

Amblyopia is reduced best-corrected visual function caused by abnormal visual development during childhood, without an ocular structural lesion sufficient to explain the loss. It may be unilateral or bilateral. The brain receives unequal or persistently degraded visual input and develops reduced acuity and sometimes reduced depth perception. The phrase “lazy eye” is colloquial: the child is not lazy and cannot control the condition.

5.1 Types and amblyogenic causes

• Strabismic: persistent eye misalignment causes the brain to suppress one eye to avoid diplopia or confusion; a constant deviation is more amblyogenic than a well-controlled intermittent or alternating deviation.
• Anisometropic: unequal refractive error makes one retinal image blurrier. A relatively small inter-eye difference can matter depending on the kind and degree of refractive error and the child’s age.
• Bilateral ametropic: large, relatively symmetrical refractive errors blur both images during development.
• Meridional: persistent uncorrected astigmatic blur in one or both eyes limits development for a particular orientation.
• Deprivation: cataract, corneal opacity, severe ptosis covering the pupil, vitreous opacity or other visual-axis obstruction blocks the image. This is particularly time-sensitive in infants.

5.2 Recognition and diagnosis

Symptoms can be subtle. A child may close one eye, tilt the head, misjudge distances or have poor school performance, but many children are identified only by vision screening. Measure best-corrected acuity separately in each eye, assess fixation and alignment, perform cycloplegic refraction and examine the cornea, lens, retina and optic nerve to exclude structural disease. A difference in acuity between eyes can be clinically significant even if the child does not complain.

5.3 Treatment principles

1. Remove deprivation urgently: a visually significant congenital cataract or pupil-covering ptosis needs prompt specialist management; optical rehabilitation begins promptly after treatment.
2. Correct refractive error: prescribe glasses/contact lenses as directed and encourage full-time wear when prescribed. Optical correction alone can improve acuity in some children.
3. Promote use of the weaker eye: a paediatric ophthalmologist may prescribe part-time patching of the stronger eye or atropine penalization in selected children. The dose and duration depend on age, severity, cause and response.
4. Monitor both eyes: follow-up checks acuity in each eye, refraction, alignment, adherence and for reverse amblyopia in the fellow eye. Do not increase patching independently.
5. Treat the underlying alignment problem: glasses, amblyopia therapy and sometimes strabismus surgery may all be needed; surgery to straighten eyes alone does not automatically cure amblyopia.

Earlier treatment is generally more effective, but older children and adolescents may still benefit; do not withhold assessment because a child has passed a presumed “critical age.” Adherence, caregiver support, school coordination and clear explanation often determine whether treatment succeeds. The source slide’s fixed age windows, full-time patching as the universally most effective option and exact patching-hour ranges are not one-size-fits-all current prescriptions.

6. Strabismus, esotropia, exotropia and pseudo-strabismus

Strabismus is a misalignment in which the eyes do not point at the same target. The deviation may be constant or intermittent, one-sided or alternating, and horizontal, vertical or torsional. It can cause amblyopia, loss of binocular fusion and stereopsis, abnormal head posture or diplopia. New acquired misalignment may be associated with cranial nerve palsy, orbital disease, trauma, neurologic illness or raised intracranial pressure and deserves urgent assessment when accompanied by headache, vomiting, ptosis, pupil abnormality, restricted movement or reduced vision.

6.1 Infantile esotropia

Infantile esotropia is a usually large-angle inward deviation that begins early in infancy, commonly within the first six months. Brief intermittent crossing can occur in very young infants, but a constant deviation or a deviation that persists beyond early infancy should be assessed. The child may alternate fixation or cross-fixate, using one eye when looking toward one side and the other eye when looking the opposite way. This can mimic bilateral abduction weakness. A specialist tests abduction using age-appropriate methods, including vestibulo-ocular responses where appropriate. Latent or manifest latent nystagmus, inferior oblique overaction and dissociated vertical deviation may be associated features.

Assessment includes cycloplegic refraction and amblyopia treatment. Early alignment may improve the opportunity for binocular function, but timing and procedure are specialist decisions. Surgery may involve recession/resection of extraocular muscles or another selected method. Families should know that repeat surgery or later treatment for vertical deviation can sometimes be needed. The exact angles, ages and named operations in the source deck reflect one teaching scheme and must not replace the individual strabismus assessment.

6.2 Accommodative esotropia

Hyperopia can make a child accommodate excessively to focus; accommodation is linked to convergence, so the eyes turn inward. In fully accommodative esotropia, appropriate hyperopic glasses may control the deviation at distance and near. Partial accommodative esotropia improves but leaves a residual angle despite full refractive correction; surgery, if needed, addresses the residual deviation measured with the glasses on. A high AC/A ratio may produce a larger near than distance deviation and bifocals may be considered by a specialist. Measure alignment with and without prescribed correction and treat any amblyopia.

6.3 Exotropia

Exotropia is an outward deviation. Intermittent exotropia may appear when a child is tired, ill, inattentive, daydreaming or viewing a distant target; children may close one eye in bright sunlight. The deviation can be well controlled much of the time or become increasingly frequent and harder to control. Check refraction and binocular function. Children with stable, well-controlled intermittent exotropia may be observed; worsening control, symptoms, loss of binocular function or constant deviation warrants specialist management. Glasses may help when there is a significant refractive error; over-minus lenses and surgery are selected cautiously because effects and trade-offs vary. Do not prescribe over-minus glasses or decide for surgery from a slide alone.

The deck lists infantile/early-onset, intermittent, convergence-insufficiency, sensory and consecutive exotropia. In sensory exotropia, reduced sight in one eye causes loss of alignment; assess for cataract, retinal disease or optic neuropathy. Consecutive exotropia may follow prior esotropia treatment. These categories need an eye-movement, acuity and refraction assessment to identify the cause.

6.4 Pseudoesotropia and pseudoexotropia

Pseudoesotropia describes an appearance of inward turning despite normal ocular alignment, commonly because a broad or flat nasal bridge and prominent epicanthal folds hide part of the nasal sclera. Pseudoexotropia can arise from facial anatomy or an apparent displacement of the corneal light reflex. A corneal light reflex and cover-uncover/alternate-cover test help separate appearance from true deviation. A normal alignment test supports pseudo-strabismus, but a photograph or facial appearance alone cannot exclude real strabismus. If uncertain, refer; a child with pseudoesotropia can later develop true strabismus.

7. Congenital nasolacrimal duct obstruction

Congenital nasolacrimal duct obstruction (CNLDO) is commonly due to a persistent membrane near the distal nasolacrimal duct at the valve of Hasner. Tears pool and overflow, and there may be crusting or intermittent mucous discharge from birth or the first weeks of life. Symptoms may worsen with colds or nasal congestion. Gentle pressure over the lacrimal sac may reflux mucus. A fluorescein dye disappearance test may help a trained clinician assess drainage. Most cases resolve spontaneously during the first year.

7.1 Management and red flags

• Explain lid hygiene and demonstrate Crigler massage: firm but gentle downward pressure over the lacrimal sac near the inner canthus, using a clean finger. Do not press along the bony side of the nose.
• Topical antibiotic drops or ointment are reserved for significant mucopurulent discharge or secondary infection; they do not open the duct and prolonged unnecessary use should be avoided.
• Persistent symptoms after about 12 months, severe symptoms or unusual anatomy may lead to probing, irrigation, balloon dilation or intubation by an ophthalmologist. Timing varies with severity and specialist practice.
• A bluish swelling at the medial canthus in a young infant may be a dacryocele/dacryocystocele; bilateral lesions can obstruct nasal breathing and require early specialist assessment.
• Dacryocystitis is an emergency: painful red swelling over the lacrimal sac, purulent discharge, fever or an unwell infant may require systemic antibiotics and hospital care.
• Persistent tearing with photophobia, corneal haze, enlarged eye or blepharospasm is not typical simple CNLDO; exclude congenital glaucoma.

8. Chalazion and hordeolum (stye)

A chalazion is a focal inflammatory lump caused by blockage of a meibomian oil gland. It is often a firm, relatively painless nodule within the tarsal plate, though early lesions can be red, tender and swollen. Blepharitis, meibomian-gland dysfunction, rubbing or skin inflammation can contribute. A hordeolum (stye) is an acute infection/inflammation of an eyelid gland or eyelash follicle, often tender and more superficial at the lid margin; it may form a small abscess.

• Use warm—not scalding—compresses for several minutes at a time and gentle lid hygiene; repeat regularly while the lesion is active.
• Do not squeeze, puncture or share towels. Handwashing limits spread and secondary irritation.
• Antibiotic ointment is not needed for every chalazion; it may be prescribed when there is associated bacterial infection, drainage or blepharitis. Systemic antibiotics are considered for cellulitis or spreading infection under clinical guidance.
• A large lesion that presses on the cornea can induce astigmatism or blur in a young child; persistent, recurrent or atypical lesions need review. Incision/curettage or steroid injection is an eye-clinic procedure; young children often require anaesthesia.
• Urgently assess fever, spreading erythema, proptosis, restricted movements, reduced vision or pain with eye movement because these may indicate preseptal/orbital cellulitis rather than a simple lid lump.

9. Corneal abrasion

A corneal abrasion is loss of corneal epithelium, usually after a fingernail, paper, dust, plant material or contact-lens injury. Symptoms include pain, tearing, foreign-body sensation, redness and photophobia; the child may keep the eye closed. Fluorescein staining under blue light reveals an epithelial defect. Ask about contact lenses, high-velocity metal/stone, chemical exposure, penetrating injury and possible retained material. Evert the upper lid when trained to look for a hidden foreign body causing vertical scratches.

9.1 First management principles

• Measure visual acuity in each eye, inspect pupils and corneal clarity and assess for penetrating injury. A peaked pupil, shallow chamber, visible wound, hyphema, severe vision loss or positive Seidel leak suggests an open globe and requires immediate shielding and referral.
• Irrigate loose superficial debris. A superficial foreign body may be removed by a trained clinician; embedded, central, rust-ring, high-velocity or contact-lens-related injuries need urgent ophthalmic advice.
• Provide appropriate oral analgesia and lubricants. A topical antibiotic may be used for selected abrasions according to local protocol; contact-lens-related defects need antipseudomonal coverage and urgent review.
• A cycloplegic may be considered for severe photophobia by a clinician, but is not required for every small abrasion. Do not use topical corticosteroid on an undiagnosed epithelial defect.
• Do not send topical anaesthetic drops for unsupervised repeated home use; they can mask worsening injury and harm the corneal epithelium. Short supervised use for examination is different.
• Routine pressure patching is not recommended for uncomplicated abrasion and can conceal deterioration. A bandage contact lens is a specialist-selected option for selected large defects with follow-up, not routine emergency treatment.
• Reassess or refer urgently for reduced vision, persistent pain, a large/central defect, infiltrate/ulcer, contact-lens use, child unable to cooperate, retained foreign body, recurrent erosion or failure to improve.

The source slide recommends pressure patching and several eye-drop regimens as general treatment. Those are not universal contemporary instructions. The treatment plan depends on abrasion size, location, cause, age, contact-lens status and whether infection or open globe is possible.

10. Congenital and paediatric cataract

A congenital cataract is lens opacity present at birth or developing in early childhood. Causes include inherited lens-development disorders, sporadic developmental abnormalities, congenital rubella, toxoplasmosis, cytomegalovirus or varicella infection, metabolic disease such as galactosaemia, and genetic syndromes including trisomy 21, trisomy 18, Lowe syndrome and others. Unilateral cataract may be sporadic; bilateral cataract should prompt careful evaluation for inherited, metabolic or infectious causes. The source slides mention autosomal dominant inheritance as a common cause, but no single cause pattern applies to every setting or child.

Any central opacity, abnormal/absent red reflex or leukocoria needs urgent referral to a paediatric ophthalmologist. A dense opacity in the visual axis deprives the developing brain of a clear image and can cause profound amblyopia, nystagmus and permanent visual loss. The decision and timing for surgery depend on laterality, density, visual-axis obstruction, age, associated disease and surgical resources. Slide-dated age windows should not be treated as an unsupervised universal rule.

Management may include cataract extraction, appropriate intraocular-lens planning, contact lenses or spectacles and active amblyopia treatment. The child needs long-term monitoring for refractive change, visual-axis opacification, glaucoma, strabismus and amblyopia. In infants, implant choice and timing are specialized decisions; an IOL is not automatically placed in every very young child. Emergency students should prioritize recognition, urgent referral, review of systemic/infectious clues and caregiver counselling rather than attempting to prescribe a surgical schedule.

11. Congenital glaucoma

Primary congenital glaucoma results from abnormal development of the anterior chamber angle, impairing aqueous outflow and raising intraocular pressure. Childhood glaucoma can also be secondary to congenital anomalies, syndromes, trauma, inflammation, surgery or medicines. Babies cannot describe pain or blur. The classic symptom triad is epiphora (tearing), photophobia and blepharospasm. Examination may reveal corneal oedema or haze, large corneal diameter, globe enlargement (buphthalmos), Haab striae from breaks in Descemet membrane, optic-disc cupping, myopia or corneal scarring.

A large/cloudy eye is not merely a cosmetic finding. Pressure can stretch the infant globe and permanently damage the optic nerve; visual development is also at risk. Refer urgently to paediatric ophthalmology. Specialist evaluation may include IOP measurement, corneal diameter, anterior-chamber and optic-disc assessment, gonioscopy and examination under anaesthesia. Exact corneal-diameter and cup-to-disc thresholds in the source slides are screening clues, not standalone diagnostic criteria.

Confirmed primary congenital glaucoma is usually managed surgically, commonly with goniotomy or trabeculotomy depending on corneal clarity, angle anatomy and local expertise; other operations or pressure-lowering medicine may be required. Long-term monitoring includes pressure, corneal diameter/clarity, optic nerve, refraction and amblyopia. When a tearing infant has photophobia or a cloudy/enlarged cornea, do not assume nasolacrimal obstruction.

12. Leukocoria (white pupil): sight- and life-threatening differential

Leukocoria is a white or yellow pupillary reflex rather than the expected red reflex. It may be noticed by a caregiver, in flash photographs or during routine examination. Causes include:

• Retinoblastoma—the most important life-threatening diagnosis to exclude urgently.
• Congenital or developmental cataract.
• Retinopathy of prematurity with traction, fibrovascular tissue or retinal detachment.
• Coats disease, retinal telangiectasia with exudation or detachment.
• Persistent fetal vasculature (persistent hyperplastic primary vitreous).
• Ocular toxocariasis, retinal astrocytoma, retinochoroidal coloboma or congenital retinal dysplasia.
• Retinal detachment, congenital retinoschisis and, less commonly, prominent myelinated nerve fibres or other retinal abnormalities.

Examine both eyes and document whether the reflex is white, dull or asymmetric. Ask about squint, poor vision, prematurity and family history. Do not reassure a family that the finding is a camera artefact without an eye examination; do not delay referral while waiting to see if it recurs in another photograph. Ophthalmic evaluation may include dilated examination and ocular imaging such as ultrasound. The 9-month-old with a yellow reflex in the supplied case illustrates why leukocoria can be diagnostically difficult: the slide reports retinal detachment and later congenital retinoschisis, but retinoblastoma and Coats disease had initially been considered. The emergency lesson is urgent specialist investigation, not that one appearance identifies a single cause.

13. Retinopathy of prematurity

ROP is abnormal development of retinal blood vessels in premature infants. Normal retinal vascularization is incomplete at early gestational ages. After premature birth, supplemental oxygen and the extrauterine environment can initially suppress normal vessel growth; as the avascular retina becomes relatively hypoxic, vascular endothelial growth factor (VEGF) and other signals may drive disorganized neovascularization. Scar contraction can later pull on the retina, producing folds or detachment. ROP may progress even in an infant who looks well and is gaining weight.

13.1 Zones, stages and plus disease

Untreated cicatricial ROP can produce straightening and dragging of vascular arcades, displaced macula and optic disc, falciform retinal folds, retrolental fibrovascular tissue, partial retinal detachment and total retinal detachment. Late complications include high myopia, strabismus, amblyopia, cataract, glaucoma and retinal detachment even after acute ROP treatment.

13.2 Screening, follow-up and treatment

ROP screening eligibility and the timing of the first examination vary by national protocol, neonatal population and local resources. The supplied slide gives birth before 32 weeks or weight below 1500 g as criteria and a first examination at 4–7 weeks after birth. These are not universal criteria or timing rules. Some high-resource guidelines use a lower gestational-age threshold plus selected larger/older infants with an unstable course; countries with different neonatal outcomes may use broader criteria. In Uganda, identify and follow the current Ministry of Health/neonatal–ophthalmology protocol. NICU teams should agree locally which infants are eligible, record the planned examination date and ensure follow-up continues through adequate vascularization or treatment clearance.

Screening is performed by trained ophthalmic clinicians using indirect ophthalmoscopy or validated wide-field retinal imaging after specialist-directed pupil dilation and neonatal preparation. Initial and repeat examination timing is based on postmenstrual age, zone, stage, vascularization and disease severity—not simply chronological age. A missed appointment requires active tracing and urgent rescheduling; discharge from neonatal care does not mean ROP screening is finished.

• Treatment-requiring ROP: Type 1 or equivalent criteria based on zone, stage and plus disease needs prompt treatment, commonly within about 72 hours of identification under the applicable protocol.
• Laser ablation: treats avascular peripheral retina to reduce the angiogenic stimulus. It remains an important treatment with established use.
• Anti-VEGF injection: can be selected for certain posterior disease or clinical situations, but requires close, prolonged follow-up because later reactivation can occur and systemic considerations remain important.
• Vitrectomy/retinal surgery: may be considered for selected tractional retinal detachment or advanced disease by a vitreoretinal surgeon.
• Oxygen safety: oxygen is lifesaving and must never be withheld from a sick infant; neonatal teams titrate oxygen to the prescribed saturation range and avoid unmonitored hyperoxia.

14. Childhood eye screening

Screening identifies children who need a complete eye examination; it is not a diagnosis and it does not replace evaluation of symptoms or an abnormal red reflex. A useful screening pathway includes:

• At birth and early infancy: external eye inspection, pupil/red-reflex comparison, assessment of corneal clarity and visual behaviour; check high-risk infants and those with family history, prematurity or developmental conditions.
• During preschool years: age-appropriate monocular visual acuity or validated instrument-based screening, plus observation of alignment and red reflex. At least one formal vision screen in the preschool period is important; local programmes may repeat screening.
• School age: repeat screening according to local school-health policy, especially when the child struggles academically, develops headaches, squints or reports blur.
• Preterm infants: ROP screening is a separate scheduled retinal examination pathway and must not be replaced by ordinary school or primary-care vision testing.

Use a standardized acuity chart at the correct distance, test one eye at a time with the other properly covered, check that the child is not peeking, and record the result and testing conditions. If acuity cannot be measured reliably, the child has a visible abnormality, alignment concern or failed screen, arrange a full eye examination rather than repeatedly attempting the same screen. A normal screening result does not rule out every eye disease; a caregiver concern deserves assessment.

15. Differential diagnosis of the red or watering eye in a child

16. Applied cases

Case 1: Newborn with swollen lids and pus

A 5-day-old has rapidly worsening bilateral lid oedema and copious purulent discharge. The cornea is hazy. This is not routine bacterial conjunctivitis. Suspect gonococcal ophthalmia or another severe neonatal infection; assess systemic condition, obtain conjunctival testing urgently and arrange immediate paediatric/ophthalmology care for systemic treatment under neonatal protocol.

Case 2: A schoolchild with itching every dry season

A 9-year-old has recurrent bilateral severe itch, photophobia and thick mucus. Eversion shows large upper-tarsal papillae and the cornea has a small epithelial defect. VKC with corneal involvement is likely. Arrange ophthalmology review, protect the cornea and avoid unsupervised steroid use.

Case 3: Child who sits very close to the board

A 10-year-old has no red eye but squints at distance, holds books close and is falling behind at school. Test each eye separately and refer for age-appropriate acuity testing and cycloplegic refraction. Check for amblyopia and alignment rather than assuming a learning problem.

Case 4: Infant whose eye looks crossed

A 3-month-old appears to have an inward turning eye, but the corneal light reflex is symmetric and cover testing shows no refixation movement. Prominent epicanthal folds and a broad nasal bridge suggest pseudoesotropia. Explain that an examination supports normal alignment, but review if a true deviation, abnormal red reflex or poor fixation appears.

Case 5: Infant with a watery eye

A 2-month-old has tearing and mild mucous crusting since birth. The cornea is clear, the child is not photophobic and there is no tender red medial-canthus mass. CNLDO is likely. Demonstrate correct lacrimal-sac massage, use antibiotics only if significant secondary infection is present and give return precautions for fever, painful swelling, photophobia or corneal haze.

Case 6: Preterm infant missed a retina appointment

A former premature infant is discharged from neonatal care, but the caregiver has no date for the next retinal examination. Contact the NICU/ROP service promptly, confirm gestational age, birth weight, previous retinal findings and last examination, and arrange review in line with the local schedule. Do not wait for visible symptoms; treatable ROP can be silent.

17. Self-test

1. Why can a child have significant amblyopia without complaining of blurred vision?
2. Which symptom most strongly supports allergic conjunctivitis: itch or thick discharge?
3. Why is conjunctivitis in a neonate managed differently from routine conjunctivitis in an older child?
4. What distinguishes a chalazion from a hordeolum in broad terms?
5. What signs after a corneal injury suggest open globe and require no-touch shielding?
6. Name four amblyopia mechanisms.
7. How can a broad nasal bridge produce pseudoesotropia, and which tests assess true alignment?
8. What three symptoms form the classic congenital-glaucoma triad?
9. Why does leukocoria require urgent referral even if the child appears well?
10. What do ROP zones, stages and plus disease describe?
11. Why can an ordinary school vision screen not replace a scheduled ROP examination?
12. What is the most useful first home-care teaching for uncomplicated congenital tear-duct obstruction?

Answers

1. The better eye can compensate and the child may not know that the image from the weaker eye is blurred.
2. Itch is the most characteristic symptom of allergic conjunctivitis.
3. Neonatal causes include gonorrhea, chlamydia and HSV, which can rapidly damage the cornea or produce systemic disease and require organism-specific systemic evaluation/treatment.
4. A chalazion is typically an obstructed meibomian gland with a granulomatous lump; a hordeolum is an acute infected eyelid gland/follicle, often tender at the margin.
5. Peaked pupil, shallow chamber, visible full-thickness wound, uveal tissue, hyphema with severe injury, positive Seidel leak or high-velocity penetrating mechanism; shield and refer.
6. Strabismic, anisometropic, bilateral ametropic, meridional and deprivation amblyopia.
7. Epicanthal folds and a broad bridge hide nasal sclera and create the appearance of crossing. Corneal light reflex and cover-uncover/alternate-cover testing assess alignment.
8. Epiphora, photophobia and blepharospasm.
9. Retinoblastoma and other sight-threatening causes must be excluded urgently; early appearance does not predict harmless disease.
10. Zones describe location, stages describe severity/structural change, and plus disease describes abnormal posterior vessel dilation and tortuosity indicating disease activity.
11. ROP requires a specialist dilated retinal examination on a time-dependent preterm-infant schedule; ordinary acuity screening will miss peripheral active disease.
12. Teach clean, firm downward Crigler massage over the lacrimal sac, with return precautions for painful swelling, fever or glaucoma signs.

Key takeaways

• Test each eye individually: children can compensate for unilateral blur and may not report it.
• Severe pain, photophobia, reduced vision, corneal haze, leukocoria or neonatal purulence needs urgent assessment.
• Neonatal conjunctivitis requires organism-focused testing and systemic care when indicated; topical antibiotics alone do not treat gonococcal or chlamydial ophthalmia.
• Refractive error, strabismus and visual-axis obstruction can cause amblyopia; early correction and follow-up protect visual development.
• Differentiate true strabismus from pseudo-strabismus by checking alignment; a face or photograph alone is insufficient.
• Most uncomplicated CNLDO resolves; correct massage and judicious antibiotic use are helpful, while dacryocystitis and congenital glaucoma are emergencies.
• ROP screening is a scheduled neonatal retinal examination, with criteria and timing determined by local protocol; missed visits require active follow-up.
• Caregiver understanding and a clear route back to care are part of treatment, not optional extras.

References and further reading

• Supplied teaching deck: Common children eye disorders (54 slides).
• US Centers for Disease Control and Prevention: Gonococcal infections among neonates.
• US Centers for Disease Control and Prevention: Chlamydial infections, including neonatal ophthalmia.
• National Eye Institute: Amblyopia.
• American Association for Pediatric Ophthalmology and Strabismus (AAPOS): Nasolacrimal duct obstruction.
• AAPOS: Chalazion; AAPOS: Allergic conjunctivitis.
• AAPOS: Amblyopia; AAPOS: Strabismus; AAPOS: Infantile esotropia.
• AAPOS: Refractive errors in children; AAPOS: Vision screening.
• American Academy of Pediatrics, American Academy of Ophthalmology and AAPOS: Screening examination of premature infants for ROP (apply current national and unit-specific criteria).
• American Academy of Ophthalmology: Pediatric cataracts overview.
• American Academy of Ophthalmology: Review of retinoblastoma.
• Uganda Ministry of Health: Uganda Clinical Guidelines 2023 and MediGuide; follow current neonatal, ophthalmology and referral protocols.
• World Health Organization: Blindness and vision impairment.