The SRK/T formula for IOL power calculation is most appropriate for which clinical scenario?
- A Short axial length eyes (axial length < 22 mm)
- B Long axial length eyes (axial length > 26 mm) or highly myopic eyes ✓
- C Post-LASIK eyes with prior myopia correction
- D Dense brunescent cataracts with poor pupillary dilation
Correct answer: B. Long axial length eyes (axial length > 26 mm) or highly myopic eyes
Explanation
The SRK/T formula performs best for long eyes (axial length > 26 mm). It was specifically derived to address the limitations of the original SRK/SRK-II regression formulae in extreme axial lengths. For short eyes (< 22 mm), Hoffer-Q or Holladay formulae are preferred. Post-LASIK eyes require special formulae (Barrett True-K, Haigis-L) to account for the altered corneal power. Dense cataracts affect surgical difficulty, not the choice of biometry formula.
Reference: Khurana Comprehensive Ophthalmology, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.