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IOL Power Calculation Formulas in Post-LASIK Eyes Using Two Biometry Systems in Vietnam.

Tran Ngoc Khanh1,2, Bui Thi Van Anh3, Pham Thi Thu Thuy1

  • 1Department of Ophthalmology, Hanoi Medical University, Hanoi, Vietnam.

Acta Informatica Medica : AIM : Journal of the Society for Medical Informatics of Bosnia & Herzegovina : Casopis Drustva Za Medicinsku Informatiku Bih
|February 2, 2026
PubMed
Summary
This summary is machine-generated.

Accurate intraocular lens (IOL) power calculation is vital for post-LASIK cataract surgery outcomes. The LenStar 900 device showed better accuracy with certain formulas compared to the IOLMaster 500 with ultrasound.

Keywords:
EVO 2.0Intraocular lens calculationLenStar 900Mean absolute errorPost-LASIK cataract

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Biomedical Engineering

Background:

  • Cataract surgery replaces the clouded lens with an intraocular lens (IOL) to restore vision.
  • Precise IOL power calculation is essential for achieving desired postoperative refractive results.

Purpose of the Study:

  • To compare the predictive accuracy of various IOL power calculation formulas.
  • To evaluate these formulas in eyes with prior LASIK surgery.
  • To assess the impact of two biometric devices (LenStar 900 and IOLMaster 500 with ultrasound) on formula accuracy.

Main Methods:

  • Retrospective observational study of 37 eyes from 29 patients with prior LASIK and subsequent cataract surgery.
  • Biometric data (axial length, keratometry, etc.) collected using LenStar 900 or IOLMaster 500 with ultrasound.
  • IOL power calculated using Shammas PL, Haigis-L, Barrett TK no history, Shammas Cooke, and EVO 2.0 formulas.
  • Mean Absolute Error (MAE) assessed at 3 months postoperatively for each formula and device.

Main Results:

  • For LenStar 900, MAE ranged from 0.389 D (Barrett TK no history) to 0.574 D (Shammas Cooke).
  • For IOLMaster 500 + US, MAE ranged from 0.423 D (Barrett TK no history) to 0.601 D (Shammas Cooke).
  • LenStar 900 showed significantly lower MAE for Shammas PL, Shammas Cooke, and EVO 2.0 compared to IOLMaster 500 + US.

Conclusions:

  • IOL power prediction accuracy in post-LASIK eyes depends on the biometry device used.
  • Barrett TK (no history) and EVO formulas performed well with LenStar 900.
  • Haigis-L demonstrated consistent accuracy across both devices, suggesting its reliability with non-synchronous biometry systems.