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Updated: Sep 12, 2025

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Biometric Factors in the VRF-G Formula for IOL Power Calculation.

Oleksiy V Voytsekhivskyy1, Amit Biran2, Asaf Achiron2

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Summary

Omitting anterior chamber depth (ACD) significantly impacts intraocular lens (IOL) power calculations, especially in shorter eyes. Axial length (LT) and white-to-white (WTW) distance have less impact using the VRF-G formula.

Keywords:
IOL powerVRF-formulaaxial lengthcalculationformulas

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Optical Engineering

Background:

  • Cataract surgery requires precise intraocular lens (IOL) power calculation for optimal visual outcomes.
  • The accuracy of IOL power calculations depends on various biometric variables.
  • The VRF-G formula is a modern approach to IOL power calculation.

Purpose of the Study:

  • To determine the individual contribution of optional parameters in IOL power calculation.
  • To evaluate the impact of omitting specific biometric variables (ACD, LT, WTW) using the VRF-G formula.

Main Methods:

  • Analysis of 501 eyes undergoing cataract surgery with AcrySof IQ SN60WF IOLs.
  • IOL power recalculations were performed by omitting anterior chamber depth (ACD), axial length (LT), and white-to-white (WTW) distance individually and in combination.
  • Differences in IOL power calculations between various omission scenarios were measured.

Main Results:

  • Omitting any biometric variable, except WTW alone, significantly altered IOL power calculations (0.029-0.108 diopters).
  • Omission of ACD had the most substantial impact, causing larger power calculation differences (0.177-0.248 diopters).
  • Shorter eyes exhibited greater sensitivity to ACD omission.

Conclusions:

  • Anterior chamber depth (ACD) is a critical parameter for accurate IOL power calculation, particularly in eyes with shorter axial lengths.
  • Axial length (LT) and white-to-white (WTW) distance appear less critical for IOL power calculations with the VRF-G formula.