The SRK/T formula for IOL power calculation is considered superior to older SRK-II formula in which clinical scenario?
- A Short eyes with axial length less than 22 mm
- B Average axial length eyes (23–24 mm)
- C Long eyes with axial length greater than 26 mm ✓
- D Eyes with dense posterior subcapsular cataract
Correct answer: C. Long eyes with axial length greater than 26 mm
Explanation
The SRK/T (theoretic modification of SRK) formula incorporates a nonlinear relationship between axial length and anterior chamber depth prediction, making it more accurate than linear formulas like SRK-II in long (highly myopic) eyes with axial length >26 mm. For very short eyes, formulas such as Holladay 2 or Haigis are preferred. Modern fifth-generation formulas (Barrett Universal II, Kane, EVO) outperform SRK/T across all ranges.
Reference: Khurana Comprehensive Ophthalmology, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.