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Updated: Jun 13, 2025

Scanning Light Scattering Profiler SLPS Based Methodology to Quantitatively Evaluate Forward and Backward Light Scattering from Intraocular Lenses
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Lens Factor Choice in IOL Power Calculation after Laser Refractive Surgery: The Right Constant for Advanced Lens

Ferdinando Cione1,2, Maddalena De Bernardo1, Margherita Di Stasi1

  • 1Ophthalmological Unit, Department of Medicine, Surgery and Dentistry, Scuola Medica Salernitana, University of Salerno, 84081 Salerno, Italy.

Journal of Clinical Medicine
|September 14, 2024
PubMed
Summary
This summary is machine-generated.

The advanced lens measurement approach (ALMA) formula shows improved accuracy for intraocular lens power calculation after myopic laser vision correction when using a specific adjusted constant. This finding aids in achieving better refractive outcomes post-surgery.

Keywords:
IOL power calculationIOL power formulaslens constantrefractive surgery

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Optics

Background:

  • Accurate intraocular lens (IOL) power calculation is crucial for successful cataract surgery.
  • Previous myopic laser vision correction (LVR) presents challenges for standard IOL power calculation formulas.
  • Evaluating advanced formulas like ALMA with various lens constants is essential for refractive predictability.

Purpose of the Study:

  • To assess the accuracy of the Advanced Lens Measurement Approach (ALMA) formula for IOL power calculation.
  • To compare the performance of ALMA using different lens constants from User Group for Laser Interference Biometry (ULIB) and IOL Con platforms.
  • To investigate the impact of a decreased ULIB optimized constant (DUOC) on refractive prediction error.

Main Methods:

  • Retrospective analysis of 150 eyes from 160 patients with prior myopic PRK or LASIK undergoing cataract surgery.
  • Evaluation of the ALMA formula with nominal and optimized A-Constants for SRKT from ULIB and IOL Con.
  • Analysis of refractive prediction error (PE) using Median Absolute Error (MedAE) and percentages of eyes within ±0.50 and ±1.00 D.

Main Results:

  • The ALMA formula demonstrated lower MedAE and higher accuracy within ±1.00 D using ULIB nominal constants compared to IOL Con.
  • A statistically significant improvement in MedAE and accuracy within ±0.50 D was observed using the ALMA method with a DUOC of -1.3.
  • The adjusted constant (DUOC -1.3) significantly enhanced refractive outcomes compared to nominal ULIB constants.

Conclusions:

  • Lens constants significantly impact IOL power calculation accuracy after myopic LVR.
  • For the ALMA formula, subtracting 1.3 from optimized ULIB constants is recommended in the absence of specific optimized constants.
  • Further research is needed to validate these findings with other post-refractive surgery formulas.