Ophthalmology

Glaucoma surgery

Detailed emergency medicine study note

Glaucoma Surgery: Types, Indications, Procedures and Complications

Learning objectives

• Explain how laser and incisional glaucoma procedures lower intraocular pressure (IOP).
• Match trabeculoplasty, iridotomy, goniotomy, trabeculotomy, trabeculectomy, tube shunts, MIGS and cyclodestruction to their main clinical roles.
• Describe appropriate selection factors, pre-operative assessment, broad procedural sequence and post-operative monitoring.
• Recognize laser, filtering-surgery and drainage-device complications that need urgent review.
• Describe the emergency-medicine and nursing role without attempting to perform specialist procedures.

Contents

1. Surgical principle and indications
2. Choosing a procedure
3. Laser trabeculoplasty
4. Laser peripheral iridotomy
5. Cyclodestructive procedures
6. Childhood glaucoma surgery
7. Trabeculectomy
8. Drainage implants, MIGS and other operations
9. Pre-operative, post-operative and emergency care
10. Complications and red flags
11. Cases, self-test and answers
12. Slide-by-slide coverage map

1. Surgical principle: protect remaining sight

Glaucoma is progressive optic neuropathy. Pressure reduction with medicines, laser or surgery lowers the risk of further damage; it does not restore retinal ganglion cells or visual-field loss that has already occurred. A procedure is chosen to protect useful vision over the patient’s lifetime, not simply to produce a particular pressure reading on one visit. The target IOP is individualized according to the amount and rate of damage, baseline pressure, age, fellow-eye function, life expectancy, other eye disease, and the patient’s ability to sustain treatment.

Normal aqueous humour is made by the ciliary body, passes from the posterior chamber through the pupil into the anterior chamber, and drains mainly through the trabecular meshwork, Schlemm canal and collector channels. A smaller amount leaves by the uveoscleral route. Glaucoma procedures intervene at different points: improve trabecular outflow, bypass resistance with a new route beneath the conjunctiva, divert aqueous to an implant plate, or reduce aqueous production by treating the ciliary body.

2. Choosing surgery: selection is more than “drops failed”

Surgery may be considered when IOP remains above an individualized target, visual fields or optic-nerve structure continue to worsen despite a reasonable treatment plan, medication adverse effects or adherence barriers make sustained control impractical, disease is advanced and needs a lower target, an acute angle-closure mechanism requires definitive treatment, or a child has primary congenital glaucoma. A decision should account for expected benefit, operative risk, follow-up capacity, cost/access, patient goals and the likelihood that drops will still be needed after surgery.

Factors a glaucoma team assesses

• Disease and target: glaucoma type, IOP pattern, severity and documented progression; optic nerve, visual field and fellow-eye function.
• Angle and anatomy: gonioscopy, peripheral anterior synechiae (PAS), chamber depth, lens status, corneal clarity and previous ocular surgery.
• Conjunctiva and sclera: scarring, prior incisions, inflammation, infection, thinning or limited healthy tissue. A scarred conjunctiva can compromise a filtering bleb and affect choice of site or procedure.
• Ocular surface and lids: blepharitis, surface disease, infection and lid hygiene; these can affect comfort, healing and infection risk.
• General health and medicines: comorbid illness, anaesthesia needs, anticoagulants/antiplatelets, allergies, current glaucoma drops and any steroid exposure. Antithrombotic changes require the prescribing and surgical teams; patients should not stop them independently.
• Practical support: ability to attend frequent early follow-up, use postoperative drops, understand precautions and reach urgent care if symptoms change.

The SlideShare deck emphasizes an eye free of active inflammation, a pressure that is not dangerously uncontrolled before elective laser, and caution in eyes with end-stage damage. These are useful prompts, not absolute universal rules: an urgent pressure crisis may itself require intervention, and severe glaucoma can still benefit from surgery if there is useful vision to preserve. The ophthalmologist balances urgency, potential benefit and procedural risk for that individual.

3. Laser trabeculoplasty: ALT and SLT

Trabeculoplasty treats the trabecular meshwork in an open angle to improve aqueous outflow. It is not a treatment for pupillary block or a closed angle. Gonioscopy confirms that the target is visible and that PAS do not obstruct the area to be treated. It is used for selected open-angle glaucoma and ocular hypertension, and can be considered when daily drops are difficult to use, poorly tolerated, unavailable or insufficient. Older age, open-angle anatomy and pigmentation of the meshwork may inform the surgeon’s expectations, but age alone does not determine suitability.

Argon laser trabeculoplasty (ALT)

ALT uses thermal laser burns applied to the trabecular meshwork, historically near the junction of pigmented and less-pigmented meshwork. The deck describes argon wavelengths and describes a blanching or small gas-bubble endpoint. Those details help students understand the historical method and how a surgeon judges a laser response; energy settings and endpoints are operator-controlled and device-specific, and should not be copied as a universal recipe. Thermal treatment causes localized tissue change and contraction; biomechanical tension and biological wound-healing signals may improve trabecular access and outflow, while excessive or poorly placed treatment can cause inflammation, scarring or PAS.

Selective laser trabeculoplasty (SLT)

SLT uses short pulses from a frequency-doubled Nd:YAG laser that are preferentially absorbed by pigmented trabecular cells. The intended effect is selective biological stimulation with less collateral thermal damage than ALT. In suitable patients, SLT can provide pressure reduction comparable to ALT; response varies, and no fixed success percentage applies to every population, glaucoma subtype or follow-up period. Because the tissue effect differs, SLT may be repeatable in selected cases; the clinician considers prior response, angle anatomy, time since treatment and target pressure.

Broad treatment sequence and student-facing peri-procedure care

The surgeon confirms diagnosis and open-angle suitability, reviews IOP and medications, explains expected benefit and limitations, and obtains consent. In a clinic setting, a gonioscopy lens is placed on the anesthetized ocular surface to view the angle; laser is delivered to a selected portion of meshwork. The deck describes treatment over 180° or 360°, with pre-treatment pressure-lowering and topical anaesthetic drops and a lens used to visualize the angle. The exact extent, pretreatment and postoperative medication are set by the clinician, not a fixed student checklist.

After treatment, the eye team checks the patient’s comfort and, where indicated, IOP and inflammation. Existing glaucoma medicines are commonly continued unless the prescriber deliberately changes them. A short course of topical anti-inflammatory treatment may be prescribed in some settings; routine practice varies. Follow-up assesses IOP response and whether additional treatment is needed. The source deck gives six weeks as a follow-up point; this is a slide-specific teaching example, not a universal schedule, because earlier pressure checks may be needed for higher-risk patients.

Trabeculoplasty complications

• Transient IOP rise after treatment; a significant spike can threaten an already damaged nerve.
• Anterior chamber inflammation or discomfort, usually monitored and treated according to the eye team’s plan.
• Small angle hemorrhages, particularly when the treatment lens or angle vessels are disturbed; these are not the same as a major intraocular hemorrhage.
• PAS or localized angle damage if tissue response is excessive or placement is unsuitable.
• Insufficient or temporary pressure reduction; the patient may still need drops, repeat laser or incisional surgery.
• Future filtering-surgery planning may be affected by previous angle treatment or scarring; the glaucoma surgeon considers the treatment history.

Clinical pearl: a post-laser rise in pain, blur, halos, nausea, marked redness or reduced vision needs urgent eye review. Do not reassure based solely on the fact that the patient “only had laser.”

4. Laser peripheral iridotomy (LPI)

LPI creates a small full-thickness opening in the peripheral iris so aqueous can pass directly between the posterior and anterior chambers. In a pupillary-block mechanism, this equalizes the pressure gradient that bows the iris forward and helps uncover the trabecular angle. It treats the mechanism; it does not directly repair optic-nerve damage or guarantee a normal IOP after the angle reopens.

Indications and limits

The supplied slides list primary angle-closure glaucoma, the fellow eye after an acute attack, narrow or occludable angles, intermittent/subacute closure, pupillary-block secondary angle closure, a narrow angle in a patient who also has open-angle glaucoma, and combined-mechanism glaucoma. Current decision-making distinguishes an angle-closure suspect from established primary angle closure and angle-closure glaucoma: the balance of benefit, risk and observation depends on anatomy, symptoms, IOP, PAS, optic-nerve injury and the patient’s context. LPI is commonly used after an acute pupillary-block attack once the eye is sufficiently stabilized, and the fellow eye is often assessed for preventive treatment.

LPI may not be sufficient when the angle remains crowded from plateau iris or lens anatomy, when extensive PAS have permanently closed the angle, or when a secondary mechanism is not pupillary block. The specialist may consider iridoplasty, lens extraction, medication, filtering surgery or another treatment depending on the residual mechanism and optic nerve.

Procedure and immediate follow-up: concepts to recognize

A trained ophthalmologist examines the angle, reviews the indication and consent, applies topical anaesthetic, uses a contact lens to focus the laser and creates an opening at a peripheral iris site selected for that eye. The deck notes a superior peripheral site and pigment release as one visible sign that an opening has been made. Students should understand the purpose and confirmation of patency rather than memorize a laser setting or assume pigment alone proves a durable opening. The eye team checks the opening, IOP and inflammation and provides any prescribed anti-inflammatory or pressure-lowering drops. Follow-up gonioscopy confirms whether the angle has widened and whether residual closure remains.

LPI complications and counselling

• Transient IOP elevation after laser.
• Small iris bleeding or hyphema and anterior uveitis.
• Corneal burns or endothelial injury if focusing or technique is poor.
• Glare, ghost images, lines or diplopia from light passing through an iridotomy, particularly if it is not fully covered by the upper lid.
• Closure of the opening or incomplete relief of angle closure, requiring reassessment or repeat/alternative treatment.

Patients should know what symptoms need same-day review: increasing pain, sudden blur, halos, nausea, worsening redness or loss of vision. The presence of a patent iridotomy does not rule out future pressure problems.

5. Cyclodestructive procedures

Cyclophotocoagulation applies laser energy to ciliary processes to reduce aqueous production. Transscleral diode treatment is a common approach; endoscopic methods may be used in selected cases. The slide deck also names cyclocryotherapy, which freezes ciliary tissue and is now an older, more selective approach. Cyclodestruction is generally reserved for refractory glaucoma, selected eyes with limited visual potential, or cases where other surgery is unsuitable; modern practice may also use it in selected seeing eyes using less destructive approaches. It is not interchangeable with trabeculoplasty, which acts on outflow.

Potential complications include postoperative pain, inflammation, IOP spike or inadequate lowering, hypotony, phthisis bulbi, cataract, corneal injury and loss of useful vision. The emergency clinician should treat a painful red eye or sudden visual loss after cyclodestructive surgery as urgent. The operation requires careful patient selection and follow-up because the effect can be difficult to predict.

6. Childhood glaucoma surgery

Primary congenital glaucoma is commonly due to abnormal development of the angle and impaired trabecular outflow. A child may present with tearing, photophobia, forceful eyelid closure, corneal haze/oedema, enlarged corneal diameter or buphthalmos, myopia or optic-disc damage. Delay risks permanent optic neuropathy and amblyopia, so suspected childhood glaucoma needs prompt paediatric ophthalmology assessment. Examination under anaesthesia may be needed to measure IOP, assess the angle and plan treatment.

Goniotomy

Goniotomy opens the abnormal trabecular meshwork from inside the anterior chamber. It is most feasible when the cornea is sufficiently clear for the angle to be seen using a goniolens. The SlideShare deck names the Barkan goniotomy knife and correctly links the operation to a direct incision of the obstructed trabecular tissue, creating a route from anterior chamber toward Schlemm canal. Students should know the anatomical purpose; the operation is done by a paediatric glaucoma surgeon, with surgical details and instrument choice varying by case.

Trabeculotomy

Trabeculotomy accesses Schlemm canal externally and opens the trabecular meshwork into the anterior chamber. It is useful when corneal opacity prevents gonioscopic visualization and is a major angle operation for primary congenital glaucoma. The deck refers to the Harms trabeculotome. Modern surgeons may use other instruments, ab externo techniques or circumferential approaches. If angle surgery fails or disease is complex, a specialist may consider repeat/combined angle surgery, trabeculectomy, a drainage implant or another procedure.

Paediatric peri-operative priorities

Confirm the child’s general health, developmental context, caregiver understanding, allergies and anaesthesia requirements. Assess for associated ocular/systemic anomalies and manage active infection or inflammation. The older slide text includes an unclear phrase concerning “ARI & NLD obstruction”; this appears to be a slide/OCR ambiguity and should not be turned into a clinical instruction. Treat an associated abnormality only after the paediatric eye team has clarified what is present and how it affects surgery. The slide also mentions acetazolamide to clear corneal haze; this is not a home treatment or universal pre-operative regimen. Pressure-lowering medicine may sometimes be used as a specialist-directed bridge, with the child’s weight, renal status, electrolytes and anaesthesia plan considered.

After surgery, the team monitors IOP, corneal clarity, wound healing, inflammation, infection, visual development and amblyopia risk. Caregivers need a clear schedule, drop technique demonstration, safe eye protection/activity instructions, and explicit urgent-return signs. Long-term follow-up is essential because glaucoma can persist, recur or progress after an apparently successful operation.

7. Trabeculectomy: guarded filtration surgery

Trabeculectomy creates a controlled pathway for aqueous humour to pass from the anterior chamber beneath a partial-thickness scleral flap into a subconjunctival bleb. The fluid then disperses through surrounding tissue. Antimetabolites such as mitomycin-C or 5-fluorouracil may be used to reduce scarring and improve bleb survival, but they also increase risks such as thin avascular bleb, leak and infection. Drug choice and exposure are surgeon-controlled.

When it may be selected

Trabeculectomy may be considered when progression risk is high and medication/laser is insufficient or inappropriate, when a low target IOP is needed, or when the eye’s disease severity makes a stronger pressure-lowering operation reasonable. The deck emphasizes an unscarred conjunctiva; this is important because healthy mobile conjunctiva supports a functioning bleb. Prior surgery, conjunctival scarring, inflammation, uveitis, neovascular disease, infection, poor healing, adherence/follow-up limitations and other ocular conditions all affect the risk–benefit calculation. Some features may prompt a different site, antimetabolite strategy, tube shunt or other procedure rather than being simple absolute exclusions.

Broad operative sequence from the teaching slides

1. Conjunctival access: the surgeon opens conjunctiva and Tenon’s tissue in a planned location, commonly superiorly, and controls bleeding while preserving tissue for closure.
2. Scleral flap: a partial-thickness scleral flap is fashioned; its dimensions and shape vary. It serves as a valve-like cover over the internal filtration opening.
3. Antiscarring strategy: an antimetabolite may be applied to selected tissue and then removed/irrigated according to the surgeon’s technique and safety protocol.
4. Entry into the anterior chamber: a small guarded opening is made beneath the flap to allow aqueous to pass out. The controlled resistance of the flap helps avoid uncontrolled overfiltration.
5. Peripheral iridectomy: a small segment of peripheral iris may be removed to reduce the risk of iris blocking the internal opening, especially in relevant anatomy.
6. Flap and conjunctival closure: sutures close the flap to regulate early flow and the conjunctiva is closed watertight to form the bleb.
7. Early function check: the surgeon assesses the chamber, wound, bleb appearance and pressure. Postoperative adjustment, including specialist-directed suture manipulation, may be needed as healing evolves.

This sequence corresponds to the deck’s final slides: conjunctival incision, partial-thickness scleral flap, small opening to the anterior chamber, peripheral iridectomy and flap closure. It is an anatomical overview for learning. Exact incision design, antimetabolite use, entry, suturing and postoperative intervention are operative decisions and should not be reproduced as instructions by non-surgeons.

Postoperative bleb care and follow-up

Trabeculectomy needs close early surveillance because healing can change flow quickly. The glaucoma team monitors IOP, anterior chamber depth, bleb elevation/vascularity/leak, wound integrity, inflammation, cornea and visual acuity. Prescribed topical steroids and other drops are commonly used; instructions can differ from the preoperative regimen, so patients must follow the current written plan rather than restarting old drops. Sutures may be adjusted or lysed by the surgeon if filtration is inadequate, and a low-pressure eye or shallow chamber may require urgent intervention. Patients should not rub, press, or put non-prescribed substances into the operated eye.

8. Other operations and current alternatives

Glaucoma drainage implants (tube shunts)

A tube shunt directs aqueous from the anterior chamber through a tube to a plate secured beneath conjunctiva/Tenon’s tissue. A fibrous capsule around the plate becomes the reservoir. Valved and non-valved designs differ in flow characteristics and early postoperative management. Devices may be selected for refractory or complex glaucoma, eyes with prior failed filtering surgery, conjunctival scarring, uveitis or other situations where trabeculectomy is less likely to succeed. They do not eliminate follow-up or all glaucoma drops.

Complications include tube exposure, malposition or blockage, corneal touch and endothelial loss, hypotony or pressure elevation, diplopia, plate encapsulation, infection, erosion, inflammation and retinal complications. A red painful eye, sudden visual decline or visible tube in an operated eye requires urgent ophthalmology review.

Minimally invasive glaucoma surgery (MIGS)

MIGS is a family of procedures that use smaller incisions or implants to improve aqueous outflow, commonly through the trabecular meshwork, often alongside cataract surgery. Some approaches target Schlemm canal or the suprachoroidal space. They may offer a faster recovery profile and favorable safety profile for selected patients, but expected pressure lowering is often more modest than trabeculectomy or a tube. They are generally considered for selected mild-to-moderate open-angle disease; device availability, evidence and indications vary. MIGS is not a substitute for LPI in pupillary block, nor the right operation for every advanced case.

Nonpenetrating filtration and canal-based surgery

Deep sclerectomy, viscocanalostomy and canaloplasty aim to enhance drainage while avoiding a full-thickness guarded opening into the anterior chamber. They can reduce risks linked to abrupt overfiltration in selected contexts but have their own technical demands, outcomes and postoperative considerations. Students may encounter these options in specialist practice; local availability and surgeon experience matter.

Lens extraction and iridoplasty in angle closure

When the lens contributes substantially to crowding or angle closure, cataract/lens extraction may address an important anatomical factor. Peripheral iridoplasty can contract peripheral iris tissue in selected persistent appositional closure, including plateau iris after iridotomy. These treatments are chosen according to gonioscopy and mechanism; a laser iridotomy alone does not solve every narrow-angle problem.

Cyclodialysis: historical context

The deck includes cyclodialysis as a procedure that creates a cleft between ciliary body and sclera to increase outflow. It is not routine modern glaucoma surgery. A traumatic cyclodialysis cleft can instead cause severe hypotony, choroidal detachment and reduced vision. Teach the anatomy and historical context, but do not present it as a standard contemporary operation.

9. Peri-operative care for emergency-medicine students

Before surgery or laser

• Record presenting symptoms, visual acuity in each eye, pupils, IOP when safely obtained, relevant examination, previous eye operations and medications.
• Check for active ocular inflammation, infection, corneal disease, blepharitis, conjunctival scarring and systemic conditions relevant to anaesthesia or pressure-lowering drugs.
• Clarify glaucoma type and angle mechanism; the same operation does not treat every mechanism.
• Communicate anticoagulants, allergies, asthma/COPD, bradycardia/heart block, cardiac or renal disease, pregnancy when relevant, and medication access/adherence barriers.
• Confirm the consent discussion and patient/caregiver understanding are handled by the eye team. Explain that surgery may slow further loss but cannot reverse established field damage and may not remove the need for drops.
• For an emergency crisis, prioritize urgent specialist contact and stabilization under local protocol. Do not delay definitive ophthalmic care to complete nonessential tests.

After a procedure

• Use the exact written medication plan for the operated eye; distinguish it from old drops and from the other eye’s regimen.
• Support the prescribed shield/activity and hygiene instructions. There is no one universal positioning or head-up instruction for every glaucoma operation.
• Observe pain, vision, redness, discharge, nausea, pupil, corneal clarity and IOP when ordered. Record medicines and timing.
• Ensure follow-up is booked before discharge and the patient knows where to return urgently, including outside normal clinic hours.
• Use teach-back: ask the patient/caregiver to explain which eye, which drops, how often, what to avoid and which symptoms are urgent.

10. Complications: recognition and urgency

The supplied deck names PAS, small hemorrhages, IOP elevation, uveitis and possible later impact on filtering surgery after laser trabeculoplasty; it also lists bleeding, iritis, glare/diplopia and corneal injury after LPI. For filtration surgery, it emphasizes visual loss, choroidal or retinal detachment, chronic hypotony and anterior-segment necrosis. These are serious potential complications, not expected outcomes; risk differs by procedure and patient. Any sudden postoperative visual deterioration deserves urgent assessment.

11. Emergency recognition and referral checklist

12. Applied cases

Case 1: laser choice and expectations

A 67-year-old with open-angle glaucoma struggles to use multiple daily drops because of cost and hand arthritis. The angle is visible on gonioscopy and there is no PAS across the planned treatment area. Trabeculoplasty may be discussed as an alternative or adjunct, depending on target IOP and access. Explain that response varies, drops may still be needed, and follow-up remains necessary. A fixed “75–80% success” promise from an old slide would be misleading.

Case 2: pain after iridotomy

A patient returns several hours after LPI with worsening blur, halos and nausea. Do not assume these symptoms are routine. Arrange urgent eye review for IOP spike, inflammation, incomplete opening or another complication. Record vision and the exact onset and do not advise the patient to wait for routine follow-up.

Case 3: infant with cloudy enlarged cornea

A 5-month-old has tearing, photophobia and corneal haze. Congenital glaucoma is suspected. Prompt paediatric glaucoma assessment is required. If the cornea is clear enough, goniotomy may be considered; opacity may favor trabeculotomy. The operation is selected by the paediatric ophthalmologist after examination and anaesthesia planning.

Case 4: postoperative trabeculectomy red eye

A patient several weeks after trabeculectomy has a painful red eye, discharge and reduced vision. Bleb-related infection or endophthalmitis is possible. This is a sight-threatening emergency requiring immediate ophthalmology; do not simply prescribe routine conjunctivitis treatment or delay for a scheduled visit.

13. Self-test

1. What is the principal effect of trabeculoplasty, and what anatomy must be present for it to work?
2. How does LPI relieve pupillary-block angle closure, and why might it not be sufficient?
3. Why is SLT often preferred over ALT in contemporary practice where available?
4. Which childhood operation generally requires a clear cornea for angle visualization? Which may be useful if the cornea is opaque?
5. Name the six broad operative stages in a conventional trabeculectomy described in the slides.
6. Why does conjunctival scarring matter before filtering surgery?
7. Which symptoms after glaucoma surgery require urgent review?
8. What is the role of a drainage implant compared with MIGS?
9. Why should the slide’s six-week follow-up and 75–80% success figures not be treated as universal?
10. Which older operation in the deck is not routine modern glaucoma surgery?

Answers

1. It stimulates or treats the trabecular meshwork to improve outflow; the angle must be open and the target meshwork accessible.
2. It creates an alternate passage through peripheral iris to equalize posterior/anterior chamber pressure. Persistent plateau iris, lens crowding, PAS or a different secondary mechanism may require more treatment.
3. SLT has comparable pressure-lowering potential in suitable open-angle patients, causes less thermal collateral injury and can be repeated selectively; availability and response vary.
4. Goniotomy needs a clear enough cornea to view the angle; trabeculotomy can be useful when corneal opacity prevents that view.
5. Conjunctival access, partial-thickness scleral flap, guarded opening into the anterior chamber, peripheral iridectomy when indicated, flap suturing and watertight conjunctival closure.
6. A healthy mobile conjunctiva is important to form and maintain a functioning bleb; scarring raises failure risk and may change procedure/site choice.
7. Increasing pain or redness, sudden blur/vision loss, halos with nausea, discharge, flashes/floaters/curtain, wound leak, hyphema or visible tube exposure.
8. A tube diverts aqueous to a plate and may suit complex/refractory eyes; MIGS improves outflow through smaller procedures in selected cases and usually provides more modest IOP reduction.
9. They are historical study-slide values; timing and success depend on risk, procedure, population and surgeon plan. Follow-up may be earlier or later and published outcomes are not guarantees.
10. Cyclodialysis is of historical interest but is not routine modern glaucoma surgery.

14. Key takeaways

• Glaucoma surgery lowers IOP to reduce future optic-nerve damage; it cannot restore established loss, and follow-up continues after an apparently successful operation.
• ALT/SLT improve trabecular outflow in an open angle; LPI relieves pupillary block; goniotomy/trabeculotomy open the abnormal childhood angle; trabeculectomy and tube shunts create alternative drainage routes; cyclodestruction reduces aqueous production.
• Procedure choice depends on mechanism, severity, target IOP, angle and conjunctival anatomy, prior surgery, healing risk and ability to attend follow-up.
• Acute postoperative pain or visual decline is never dismissed as routine. Infection, pressure spike, hypotony, choroidal/retinal complications and tube/bleb problems can threaten vision.
• Emergency clinicians recognize danger signs, protect the eye, document visual function, communicate early and follow the eye team’s local medication plan.

15. Slide-by-slide coverage map: supplied 38-slide glaucoma surgery deck

This map shows where the individual teaching points from the SlideShare have been incorporated. The deck’s dated or ambiguous statements are retained as historical context and corrected where needed.

1. Slide 1: glaucoma surgery topic and scope.
2. Slide 2: laser versus incisional procedures and main surgical families.
3. Slide 3: trabeculoplasty, peripheral iridotomy, cycloablation and other laser categories.
4. Slide 4: trabeculoplasty mechanism and patient selection, including practical drop-adherence barriers.
5. Slide 5: older age as a selection consideration, not a stand-alone indication.
6. Slide 6: open-angle disease as the target for trabeculoplasty.
7. Slide 7: pigmentation, pseudoexfoliation and pigmentary glaucoma context.
8. Slide 8: pre-laser inflammation, uncontrolled pressure and advanced damage as planning considerations.
9. Slide 9: ALT background and contemporary comparison with SLT.
10. Slide 10: trabecular target and the operator’s tissue-response endpoint.
11. Slide 11: biomechanical and biological outflow response.
12. Slide 12: broad lens-assisted treatment, selected 180°/360° extent, medication and follow-up concepts.
13. Slides 13–17: PAS, microhemorrhage, pressure spikes, uveitis and filtering-surgery considerations after laser.
14. Slide 18: SLT mechanism, repeatability in selected eyes and caution against universal success-rate claims.
15. Slide 19: LPI opening and pupillary-block mechanism.
16. Slides 20–25: angle closure, at-risk fellow eye, narrow/occludable angles and selected secondary or combined-mechanism indications.
17. Slide 26: peripheral iris site and confirmation concepts, described without unsafe laser settings or operative instructions.
18. Slide 27: bleeding, iritis, visual symptoms and corneal injury after iridotomy.
19. Slide 28: childhood angle procedures and their place among congenital glaucoma operations.
20. Slide 29: goniotomy, clear-corneal visualization and Barkan knife context.
21. Slide 30: not present in the supplied slide numbering/extracted deck.
22. Slide 31: paediatric preparation; ambiguous “ARI & NLD obstruction” wording flagged rather than repeated as a directive; acetazolamide is contextualized as specialist-directed only.
23. Slide 32: trabeculotomy, purpose and Harms instrument reference.
24. Slide 33: trabeculectomy selection and conjunctival suitability.
25. Slides 34–38: conjunctival access, scleral flap, guarded anterior-chamber opening, peripheral iridectomy and flap/conjunctival closure.

References and further reading

• Supplied teaching deck: Surgery—Glaucoma (38 slides).
• National Eye Institute: Glaucoma surgery.
• American Academy of Ophthalmology EyeWiki: Trabeculectomy.
• AAO EyeWiki: Laser trabeculoplasty—ALT vs SLT.
• AAO EyeWiki: Laser peripheral iridotomy.
• AAO EyeWiki: Primary congenital glaucoma.
• AAO EyeWiki: Glaucoma drainage devices.
• AAO EyeWiki: Minimally invasive glaucoma surgery.
• AAO EyeWiki: Cyclodestructive procedures.
• European Glaucoma Society: Guidelines.
• Uganda Ministry of Health: Uganda Clinical Guidelines 2023; follow current hospital and specialist protocols.

Educational note: This material supports undergraduate emergency-medicine and ophthalmology learning. It does not replace local protocols, specialist assessment, operative training or individualized clinical judgment.