Author: Claude (AI), from PubMed abstracts · Reviewed by: Dr Mina Abdelmseih · Reviewed: 2026-11-15 · Review due: 2027-11-15

Educational content only. Not personalised medical advice. Clinical decisions remain the responsibility of the treating clinician.

Posterior capsule opacification

Posterior capsule opacification (PCO) is clouding of the posterior lens capsule after cataract surgery and the most common postoperative complication of modern surgery with a posterior chamber IOL [S6]. It causes reduced acuity, cloudy vision and loss of contrast, and is treated with Nd:YAG laser capsulotomy, which is unavailable in large parts of the developing world [S1] [S6].

Key points - Sharp-edged IOL optics reduce PCO and Nd:YAG capsulotomy; at five years the Cochrane estimate was RR 0.21, or 331 fewer capsulotomies per 1000 eyes [S6]. - Edge design matters in MSICS too: an Indian RCT found better BCVA at 12 and 18 months with low-cost square-edged IOLs [S9]. - Hydrophobic IOLs had lower capsulotomy rates than hydrophilic IOLs (OR 0.38) [S2]. - Nd:YAG capsulotomy may increase the risk of pseudophakic retinal detachment (RR 1.57) [S7]. - A single dose of brimonidine 0.2% one hour before laser, as reported in [S8] [S11], prevented significant IOP rises in small RCTs.

Evidence last checked: 2026-10-17 (PubMed abstracts).

Red flags

• Flashes, floaters or a field shadow after Nd:YAG capsulotomy: possible retinal detachment; the association was stronger in Asian populations (RR 4.54) and after extracapsular extraction (RR 2.97) [S7].
• Sudden vision drop or pain after capsulotomy: possible IOP spike [S8] [S11].
• Gradual blur months or years after surgery is expected PCO, but other causes such as macular oedema should be excluded [S6].

Recognise it

• Main symptoms: decreased acuity, cloudy or blurred vision and reduced contrast sensitivity [S6].
• After premium (multifocal, EDOF, toric and accommodative) IOLs, Nd:YAG capsulotomy incidence was 0.5% at 6 months, 3.7% at 12 months and 18.1% at 24 months [S10].
• Patients at higher PCO risk include those with high myopia, younger age, diabetes or grade III to V nuclear hardness [S10].

Confirm it

• In trials PCO was assessed under slit-lamp illumination by an independent observer [S9] or quantified with scores such as AQUA and EPCO [S6].

Manage it

Before acting on this section, check the national and local guidelines, product information and regulatory approvals that apply where you practise. See the medical disclaimer.

Tier A (primary care / no specialist)

• Refer patients whose vision deteriorates gradually months after cataract surgery to an eye clinic; PCO is common and treatable [S6].
• After laser capsulotomy, tell patients to return the same day if flashes, floaters or a shadow appear [S7].

Tier B (general eye clinic)

1. Prevent it at surgery. - Choose sharp (square) posterior optic edge IOLs: preferred in both Cochrane reviews [S1] [S6] and effective in MSICS [S9]. - Prefer hydrophobic to hydrophilic acrylic material where available [S2]. A network meta-analysis found the lowest capsulotomy risk with one hydrophobic acrylic brand (hazard ratio 7.54 for hydrophilic acrylic vs that brand) [S4]. - Anterior capsule polishing was associated with lower PCO (OR 0.42) in one RCT and four cohort studies [S3]. - Anti-inflammatory regimen choice did not influence PCO [S1]. - For premium IOLs, avoid silicone, plate-loop or four-haptic, round-edge and accommodative designs in high-risk patients [S10].
2. Treat it. Nd:YAG laser capsulotomy is the standard treatment [S6] [S8].
3. Prevent IOP spikes. Betaxolol 0.5% or brimonidine 0.2% as a single topical dose 1 hour before laser (as reported in [S8]) prevented clinically significant rises in 38 eyes. Dexmedetomidine 0.008% was inferior to brimonidine 0.2%, with more spikes above 10 mmHg (9% vs 2%) [S11].

Tier C (specialist centre)

• Capsular tension rings were associated with fewer capsulotomies (OR 0.241) in a meta-analysis of 8 studies, with very high heterogeneity for PCO scores [S5].
• Retinal detachment after capsulotomy: examine the peripheral retina in symptomatic patients, especially in high-risk groups [S7].

Refer when

Pitfalls

• Using round-edged IOLs when sharp-edged ones are affordable [S6] [S9].
• Expecting the anti-inflammatory regimen to prevent PCO [S1].
• Forgetting the retinal detachment risk after capsulotomy, particularly after extracapsular surgery [S7].
• Implanting high-PCO-risk premium IOL designs in young, myopic or diabetic patients [S10].

Evidence notes

• [S1] found no clear difference between optic materials, whereas [S2] and [S4] favour hydrophobic acrylic: the newer analyses include different studies and designs.
• [S4] compared one manufacturer's IOL family with others; the abstract does not state funding, so the Editor-in-Chief should check for industry support.
• The one-year Cochrane estimate for capsulotomy was imprecise (Peto OR 0.30, CI 0.05 to 1.74); longer follow-up was more precise [S6].
• Not covered by these sources: Nd:YAG laser energy settings and technique, surgical capsulotomy where no laser is available, and paediatric PCO.

Related articles

• Complications of cataract surgery
• Paediatric cataract

References

See the numbered source list below. Each marker [S#] links to its PubMed and DOI record.