Phacoemulsification Step by Step: Complications and Their Management

Phacoemulsification is easiest to remember as a controlled progression: create access, make a continuous capsular opening, free the lens safely, divide and remove it while protecting the capsule and endothelium, clear cortex, then decide whether the remaining support permits an intraocular lens (IOL). In an examination, a list of machine settings is rarely a good answer. Examiners want to hear that you recognise the stage, preserve the chamber, stop the manoeuvre that is creating traction or surge, and change the plan when support is lost.

This is postgraduate surgical and viva education for clinicians, not an operative protocol or advice for an individual patient. Exact settings, incision choice, devices and rescue manoeuvres depend on the eye, the platform and supervised surgical judgement.

The one-line map to reconstruct first

If you forget a detail, reconstruct the operation by asking what must be true before the next step.

The cataract study guide is the broader topic hub. This article focuses on the sequence-and-complication reasoning that turns a long surgical viva into a set of decisions.

Before the incision: predict the problem

The preoperative answer is not a ritual recital. Name the features that change risk: a very dense nucleus can increase ultrasound energy and endothelial risk; a small pupil may limit capsular and nuclear work; pseudoexfoliation, phacodonesis, prior trauma or previous surgery may imply compromised zonules; a shallow chamber changes working space; corneal disease may constrain the endothelial reserve. A posterior polar cataract deserves its own caution because posterior capsular abnormality may be present. A mature white cataract can make the initial capsule opening harder to control.

For each feature, state the principle it changes. For example: “With suspected zonular weakness, I would plan to minimise traction and be prepared to use capsular support according to the extent of weakness and local supervision.” That is safer and more intelligent than promising that one device is indicated in every eye.

The AAO cataract education collection and a current supervised surgical curriculum are appropriate places to verify local technique. In a written answer, distinguish a risk factor from a complication: pseudoexfoliation is a clue to reduced support; posterior capsular rupture is an intraoperative event.

Access, chamber maintenance and capsulorhexis

Incisions provide access but also influence chamber stability. A leaking wound, repeated instrument movement through a tight entry or poor sealing can turn later steps into a fluidics problem. Viscoelastic is used to maintain space and protect intraocular structures; it is not a substitute for sound wounds and controlled technique.

The continuous curvilinear capsulorhexis is the central early checkpoint. Its goals are a continuous, reasonably centred opening that allows nucleus manipulation and retains a capsular rim for later support. The relevant failure pattern is a radial run-out. In a viva, first say that you would pause and reassess rather than continue pulling in the same direction. The danger is extension toward the equator or posterior capsule, which changes the safety of subsequent hydrodissection, nucleus work and IOL planning.

Do not confuse an incomplete rhexis with a posterior capsular rupture. They are anatomically and prognostically different. A useful answer is: “I would assess the extent and direction of the extension, maintain the chamber, reduce further stress on the capsule, and modify the next steps to the remaining capsular support.” Exact redirection techniques should be learned hands-on, not copied from an article into an operating theatre.

Hydrodissection and nucleus management: understand the planes

Hydrodissection aims to mobilise the lens within the capsular bag; hydrodelineation separates an inner nucleus from an epinuclear shell. These terms are often tested together, so anchor them to anatomy rather than memorising labels. A visible fluid wave is reassuring only in context. Resistance, a bulging posterior capsule, a very shallow chamber or a case in which posterior capsule integrity is uncertain should make the candidate slow down and reconsider forceful fluid injection.

During nucleus management, the generic safety goals remain stable: keep the working space formed, protect the posterior capsule and corneal endothelium, avoid excessive traction on zonules, and use energy and fluidics appropriate to the density and chosen technique. “Divide and conquer,” chopping approaches and other strategies are techniques, not competing moral positions. The correct exam response is to explain why a surgeon might choose a lower-stress strategy in a particular eye, then acknowledge operator experience and supervision.

An examiner may ask what “surge” means. Explain it as the rapid inflow of fluid into the aspiration system after an occlusion breaks, which can destabilise the chamber and draw the posterior capsule forward. The clinical response is not merely “increase vacuum” or “lower bottle height”; it is to recognise the fluidic situation, stop unsafe aspiration, reform stability as necessary and adjust the plan with the machine and supervisor context in mind.

Cortex, capsule and IOL: support determines the finish

Cortical removal may expose weak zonules or an occult capsular problem because the capsule is being stressed in a different direction. A safe oral answer identifies the weak area and says that traction should be directed to minimise stress there. Residual cortex is not an invitation to pull harder if the chamber or capsule is unstable.

IOL planning is a support question. When the capsular bag and zonules are adequately intact, in-the-bag placement is generally the intended anatomical location. When a complication alters support, the decision becomes case-specific: remaining capsular support, vitreous status, corneal/endothelial considerations, ocular comorbidity and the surgeon’s ability to provide a safe definitive or staged plan matter. Avoid claiming that any single IOL site is mandatory after every posterior capsular event.

At the end, remove viscoelastic as appropriate, assess wounds and chamber, and document relevant events. In a viva, state that postoperative review and escalation depend on the complication rather than promising a fixed drug regimen. This keeps the answer educational and avoids turning a general article into patient-specific management.

The complications table: identify, stabilise, then escalate

PCR deserves the clearest answer because it is a high-yield test of judgement. Say: “I would stop phacoemulsification and aspiration, stabilise the anterior chamber, assess the extent of capsular loss and any vitreous presentation, avoid traction on vitreous, and proceed with an experienced surgeon and a plan based on residual support.” This response is deliberately principle-led. It avoids unsafe universal instructions while showing that continuing the original manoeuvre is the error.

For dropped nuclear material, the key negative is equally important: do not chase fragments posteriorly. The anterior-segment surgeon should protect the eye, manage the anterior situation safely and obtain vitreoretinal assessment according to the circumstances and service.

Early and late postoperative questions

An exam can shift from the operation to a postoperative presentation. Sort the problem by time and mechanism rather than giving a single diagnosis. In the early period, consider wound integrity, pressure-related problems, corneal oedema, retained material, significant inflammation and infection in the appropriate clinical context. Later questions may address posterior capsule opacification, cystoid macular oedema, refractive surprise, lens position or retinal pathology. The phrase “consider” matters: diagnosis requires examination, and treatment must follow the patient, evidence and local protocol.

Endophthalmitis is an urgent clinical concern, not a memorisation exercise. In an educational answer, recognise a concerning postoperative inflammatory presentation and state the need for urgent ophthalmic assessment under local pathways. Do not provide a remote treatment regimen.

How to answer common phaco viva prompts

“Talk me through phacoemulsification.” Start with assessment and the sequence table. Spend more time on what each stage achieves than on brand-specific settings.

“There is a posterior capsular rupture—what now?” Use the PCR template above. Add that IOL choice follows residual capsular support and the whole ocular situation.

“Why did this complication happen?” Give a mechanism and a risk factor, then name prevention as a principle: stable chamber, appropriate energy/fluidics, reduced traction, anticipation and supervised escalation.

“Which IOL would you use?” First establish whether the bag and zonules provide support. A candidate who asks for the relevant anatomy before naming a lens is demonstrating judgement.

For structured practical revision, use the site’s OSCE, Practical & Viva Voce resource. It should supplement, never replace, theatre supervision, wet-lab practice and current departmental protocols.

Rapid recall grid

1. Stage first: where in the operation did the event occur?
2. Barrier second: capsule, zonules, cornea, iris, vitreous—which structure is threatened?
3. Stop third: stop the manoeuvre causing traction, surge or energy injury.
4. Stabilise fourth: form the chamber and reassess anatomy.
5. Support fifth: choose the next step and IOL plan from remaining support.
6. Escalate sixth: bring in senior, corneal or retinal expertise when the event exceeds safe scope.

That six-part sequence makes the answer reproducible under pressure without pretending that surgery can be learned from prose.

Revision drill: turn the sequence into decisions

One efficient way to revise phaco is to cover the right-hand column of the sequence table and reconstruct it from a complication. If the stem says “the chamber suddenly deepens and the nucleus is no longer behaving normally,” the threatened barrier is posterior capsule; the safe next phrase is to stop phaco and aspiration, not to list a preferred chopping technique. If it says “the bag moves asymmetrically during cortex removal,” think zonules and change traction. If it says “fragments fall behind the posterior plane,” think posteriorly displaced lens material and avoid pursuit from the anterior chamber.

This method also prevents a common written-paper error: collapsing a chain of events into one label. PCR can be complicated by vitreous prolapse, altered IOL support and retained/dropped lens material, but those are not automatically synonymous. Describe what you can see, then state the principle that follows. The same discipline applies to corneal oedema: it may reflect energy exposure, endothelial reserve, a Descemet problem, pressure or inflammation. A vignette needs its signs and timing before it earns a diagnosis.

In theatre, the safest learning loop is supervised feedback after every case: what was anticipated, what changed, which decision protected the eye, and what should be planned differently next time. Reading gives vocabulary and frameworks; observation, wet-lab practice and graded responsibility develop the motor and judgement components separately.

Sources

• American Academy of Ophthalmology: cataract education — professional educational reference, accessed 18 August 2026.
• Posterior capsule rupture during cataract surgery: review, PubMed — peer-reviewed complication review.
• Cataract surgery, StatPearls — terminology and complication cross-check, accessed 18 August 2026.
• ESCRS Cataract Guidelines — guideline resource; check current version before clinical use.