Anterior capsule contraction syndrome (capsular phimosis) after cataract surgery is most likely to occur with which IOL design?

• A Three-piece PMMA IOL with 13 mm overall diameter
• B Single-piece hydrophilic acrylic IOL with round-edge design
• C Single-piece hydrophobic acrylic IOL with square-edge haptics
• D Plate-haptic silicone IOL ✓

Explanation

Capsular phimosis (anterior capsule contraction) is most pronounced with plate-haptic silicone IOLs because the large haptic area does not sufficiently resist centripetal anterior capsule contraction. PMMA lenses with larger overall diameters provide better mechanical support against capsular contraction. Capsulorrhexis size less than 5 mm, post-operative inflammation, and pseudoexfoliation are additional risk factors. Treatment is YAG laser relaxing incisions in the contracted anterior capsule.

Reference: Khurana Comprehensive Ophthalmology, 7th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.