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New research · Ophthalmology
Diagnostics (Basel, Switzerland) · 2d
Cohort studyDiagnostics (Basel, Switzerland) · 2026

Comparative Analysis of Twenty Intraocular Lens Power Calculation Formulas in Medium-Long Eyes.

Wiktor Stopyra, Oleksiy Voytsekhivskyy, Andrzej Grzybowski
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OphthalmologyCohort study

SRK/T formula gave the most accurate lens power predictions in medium-long eyes.

Comparative Analysis of Twenty Intraocular Lens Power Calculation Formulas in Medium-Long Eyes.

Wiktor Stopyra … Andrzej Grzybowski
Diagnostics (Basel, Switzerland) · 2026
Background

The choice of appropriate intraocular lens (intraocular lens) power calculation formulas depends on the axial length of the eye.

Purpose

This study compares the accuracy of twenty formulas in medium-long eyes (24.50-25.99 mm).

Methods

Data of patients with medium-long eyes, who underwent uneventful phacoemulsification between January 2018 and September 2023, were retrospectively reviewed.

98.95%
Results
98.95%
SRK/T kept eye-focus errors in the safe range in nearly all patients
More results

SD values among the twenty formulas ranged from 0.179 (SRK/T) to 0.468 (Olsen OLCR).

The SRK/T formula, followed by Holladay 1, demonstrated significantly higher accuracy than most other formulas, while Olsen (OLCR) and Castrop were the least accurate.

“
Conclusion

SRK/T provided the highest accuracy in medium-long eyes, with Holladay 1 performing similarly well. All evaluated formulas achieved prediction error within ±0.50 D in over 74% of cases.

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