For IOL power calculation in a cataractous eye with an axial length of 20.5 mm, which formula is considered most accurate?

• A Hoffer Q ✓
• B SRK II
• C Haigis
• D Holladay 2

Explanation

Short eyes below 22 mm are prone to postoperative hyperopic surprise because standard formulas overestimate effective lens position. Among third-generation formulas, the Hoffer Q performs best in short axes and is the conventional answer in Indian exam settings. The SRK II is a first-generation regression formula with poor performance in axial extremes, while Haigis uses three constants including measured anterior chamber depth and Holladay 2 requires seven parameters, both useful but less favored for short eyes in standard teaching.

Reference: Kanski's Clinical Ophthalmology, 9th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.