A 70-year-old woman undergoes routine cataract surgery in her right eye. During the operation the surgeon recognises a tear in the back capsule of the lens with vitreous gel coming forward. The nucleus is already out. She is otherwise healthy, and the left eye had uneventful cataract surgery last year. The family is anxious because ‘something went wrong’.
Examination Findings
Intra-operative findings (right eye): during irrigation/aspiration a tear in the posterior capsule was recognised, with vitreous gel presenting through the rent into the anterior chamber. The nucleus had already been removed; no lens fragments in the vitreous. Post-operative day 1: visual acuity 6/36, cornea mildly oedematous, anterior chamber quiet with a well-centred sulcus intraocular lens, pupil round, no vitreous to the wound. Intraocular pressure 22 mmHg. Fundus: flat retina, no tears seen.
Investigations
The diagnosis is made intra-operatively by direct visualisation: vitreous presenting through a capsular rent. Post-operatively, a careful slit-lamp examination confirms no vitreous strands to the wound and a centred lens. Dilated fundus examination excludes retinal tears or detachment, because vitreous disturbance raises that risk. Intraocular pressure is monitored for post-operative spikes.
Questions to Think About
- Why must the vitreous be removed from the anterior chamber before placing the lens?
- Where can the intraocular lens go when the posterior capsule is torn?
- What post-operative complication is more likely after vitreous loss, and how is it screened for?
Diagnosis
Posterior capsular rupture with vitreous prolapse during cataract surgery, managed with anterior vitrectomy and sulcus placement of the intraocular lens.
Reasoning
Reasoning: Vitreous gel presenting through a tear in the posterior capsule during irrigation/aspiration is posterior capsular rupture with vitreous prolapse. The priorities are: clear the vitreous from the anterior chamber (anterior vitrectomy), then place the lens where support exists — the ciliary sulcus, given an intact anterior capsulorhexis — with adjusted power, since sulcus placement changes the effective lens position. The nucleus is already removed and no fragment dropped, which simplifies the situation. Diagnosis: posterior capsular rupture with vitreous prolapse, managed with anterior vitrectomy and sulcus intraocular lens. Management: typical management includes anterior vitrectomy, sulcus lens placement with power adjustment, anti-inflammatory drops, pressure monitoring and dilated retinal examination, per local protocol. She is counselled honestly that the surgery took a complex turn but the outcome is expected to be good.
Differential Diagnosis
- Zonular dialysis — related but different: here the tear is in the posterior capsule itself with vitreous presenting through it, not a circumferential zonular dehiscence.
- Dropped nucleus into the vitreous — ruled out: the nucleus was removed intact before the rent was recognised; vitreous presented but no lens fragment fell back.
- Simple uneventful surgery — ruled out: vitreous in the anterior chamber changes the operation and the post-operative plan.
Management
Typical management includes anterior vitrectomy to clear prolapsed vitreous, placement of the intraocular lens in the ciliary sulcus (with appropriate power adjustment) when the anterior capsule support is adequate, and a watertight wound closure per local protocol. Post-operatively, anti-inflammatory drops are used, pressure is watched, and the retina is examined with dilation. She is told the operation took a more complex path, that her lens sits securely in front of the tear, and that her visual prognosis remains good with follow-up.
Key Learning Points
- Posterior capsular rupture is the commonest serious intra-operative complication of cataract surgery — recognising it early is the skill.
- Vitreous must be cleared from the anterior chamber (anterior vitrectomy) before placing the lens; trapped vitreous causes inflammation, pupil distortion and retinal traction.
- With an intact anterior capsulorhexis, the lens can usually go safely in the ciliary sulcus with adjusted power.
- Retinal tears and detachment are more likely after vitreous loss — the dilated fundus check is mandatory.
- Honest counselling turns a complication into trust: most such eyes still achieve good vision.
Red Flags
- Vitreous presenting through the capsular rent — stop, clear it with vitrectomy; never place the lens through vitreous.
- Vitreous strands to the wound post-operatively — re-intervene; traction here risks retinal tears.
- New flashes, floaters or a shadow after vitreous loss — urgent dilated retinal examination.
Educational content only — not medical advice. Clinical decisions must be made by a qualified professional for the individual patient.
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