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Related Experiment Video

Updated: May 5, 2026

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Comparative Accuracy Of Five Modern Toric Intraocular Lens Formulas.

Soonwon Yang1, Hyoji Han1, Hyun Soo Lee1

  • 1Department of Ophthalmology, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea.

American Journal of Ophthalmology
|February 26, 2025
PubMed
Summary
This summary is machine-generated.

Five modern toric intraocular lens (IOL) calculation formulas showed excellent accuracy for cataract patients. The EVO formula demonstrated superior precision for against-the-rule astigmatism, enhancing refractive outcomes.

Keywords:
AstigmatismCalculation formulasToric intraocular lenses

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Clinical Optics

Background:

  • Toric intraocular lenses (IOLs) are crucial for correcting astigmatism during cataract surgery.
  • Accurate prediction of postoperative refractive outcomes is essential for patient satisfaction.
  • Several modern IOL calculation formulas exist, each with varying methodologies.

Purpose of the Study:

  • To compare the clinical accuracy of five contemporary toric IOL calculation formulas.
  • Evaluate formula performance in predicting refractive outcomes after cataract surgery with astigmatism.
  • Identify potential differences in accuracy among formulas, particularly in astigmatism subgroups.

Main Methods:

  • Retrospective analysis of 146 eyes from cataract patients who received toric IOL implantation.
  • Biometric data acquired using Lenstar LS900; personalized surgically induced astigmatism values applied.
  • Evaluated mean absolute prediction error (MAE), centroid error, and proportion of eyes within ±0.50 D and ±0.75 D error.

Main Results:

  • No significant overall difference in mean absolute prediction error (MAE) among the five formulas.
  • The EVO formula yielded the highest proportion of eyes within ±0.50 D prediction error (71.92%).
  • EVO, Abulafia-Koch with Hill RBF, and Naeser/Savini with Hoffer QST showed lower MAEs for against-the-rule astigmatism compared to Barrett.

Conclusions:

  • All five toric IOL calculation formulas demonstrated high overall accuracy in predicting refractive outcomes.
  • The EVO formula exhibited superior precision for eyes with against-the-rule astigmatism.
  • Findings offer valuable insights for optimizing toric IOL formula selection to improve surgical results.