The minimum recommended residual stromal bed (RSB) thickness after LASIK to avoid post-LASIK ectasia is:

• A 200 microns
• B 300 microns
• C 350 microns
• D 250 microns ✓

Explanation

A residual stromal bed (RSB) of at least 250 microns is the widely accepted minimum threshold to prevent post-LASIK ectasia. Some authorities recommend 300 µm for added safety. When RSB is projected to be < 250 µm, alternative procedures (SMILE, surface ablation/PRK, or phakic IOL implantation) should be considered. The total corneal thickness must also be ≥ 480–500 µm preoperatively for safe LASIK.

Reference: Khurana Comprehensive Ophthalmology, 7th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.