The SRK-T formula for IOL power calculation is most appropriate for which axial length range?
- A Long eyes (axial length > 26 mm) ✓
- B Short eyes (axial length < 22 mm)
- C Normal eyes (axial length 22–24.5 mm)
- D All axial lengths equally
Correct answer: A. Long eyes (axial length > 26 mm)
Explanation
The SRK-T formula (a theoretical modification of the regression-based SRK II) was specifically developed for use in long (myopic) eyes with axial lengths greater than 26 mm, where regression formulas like SRK II are inaccurate. For very short eyes (<22 mm), Holladay 2 or Haigis is preferred. Barrett Universal II and Kane formula are now considered gold standard across all axial lengths. The choice of formula is a key clinical decision affecting refractive outcomes.
Reference: Khurana Comprehensive Ophthalmology, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.