Comparative Evaluation of Intraocular Lens Power Calculation Formulas in Patients After Radial Keratotomy
Abstract
Objective This study assessing the performance of five intraocular lens (IOL) calculation methodologies in cataract patients with previous radial keratotomy (RK) history.Methods Five formulas predicted refractive outcomes, with prediction errors (PE) calculated by comparing formula-derived spherical equivalents to manifest refraction. Additional statistical analysis examined correlations between formula-specific PE and biometric parameters including axial length (AL) and corneal curvature.Results Overall, Barrett True-K and Hoffer QST showed minimal prediction bias (PE: −0.06D and −0.07D; p > 0.05). PEARL-DGS had the best stability (SD: 0.97) and led in ±0.25D accuracy (20.8%, p = 0.665). In AL subgroups, Barrett True-K showed superior accuracy for medium-long eyes (26.0–30.0 mm; PE closest to zero), while EVO 2.0 yielded significant hyperopic error in short AL eyes (
Fields of Study & Subjects
Ophthalmology and Visual Impairment Studies
Corneal surgery and disorders
Ocular Surface and Contact Lens
Publication details
- Journal / source
- Journal of Investigative Surgery
- Publisher
- Informa UK Limited
- Volume
- 39
- Issue
- 1
- Pages
- 2622155–2622155
- Publication date
- 17 February 2026
- Language
- EN