Total keratometry

31.10.2026 4 min read

IOL calculation after myopic laser correction: 3,738 eyes

Cataract IOL Refractive surgery LASIK Total keratometry IOL calculation EVO formula K6 formula Post-laser IOL calculation Posterior corneal curvature No-history IOL calculation TransPRK

In a multicenter database, modern formulas outperformed Haigis-L and Shammas-PL, while versions using posterior corneal curvature were more accurate than corresponding no-PCC methods.

doi: 10.1016/j.ajo.2026.07.059

29.10.2026 4 min read

O Formula with OCT ray tracing: was it more accurate?

Cataract IOL IOL power calculation Total keratometry Refractive stability IOL calculation Formula validation O Formula Ray-tracing IOL calculation

In a 325-eye series, O Formula had lower error than four contemporary formulas, but did not differ significantly from SRK/T and was tested at one center.

doi: 10.1016/j.ajo.2025.08.049

20.10.2026 4 min read

Total keratometry for IOL calculation does not help every eye

Cataract IOL IOL power calculation Total keratometry Corneal radius ratio Barrett Universal II

An analysis of 1,314 eyes found that total keratometry changed predictions according to the posterior-to-anterior corneal radius ratio, without a uniform gain in accuracy.

doi: 10.1016/j.ajo.2026.08.020