During phacoemulsification, a posterior capsular rent is noted. The surgeon decides to implant an IOL in the sulcus. The power of the IOL to be implanted in the sulcus compared with the originally planned capsular bag IOL should be:
- A Same power
- B 0.5 D less ✓
- C 1.0 D more
- D 0.5 D more
Correct answer: B. 0.5 D less
Explanation
When an IOL is placed in the ciliary sulcus rather than the capsular bag, it sits slightly more anterior, effectively increasing its vergence effect. To avoid a hyperopic outcome, the IOL power should be reduced by approximately 0.5 D compared with the power calculated for in-the-bag placement. This is a standard intraoperative adjustment taught in cataract surgery.
Reference: Khurana Comprehensive Ophthalmology, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.