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High myopia and cataract surgery.

Elaine W Chong1, Jodhbir S Mehta

  • 1aSingapore National Eye CentrebSingapore Eye Research InstitutecDuke-National University Singapore, SingaporedCentre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, University of Melbourne, Victoria, Australia.

Current Opinion in Ophthalmology
|November 17, 2015
PubMed
Summary
This summary is machine-generated.

Accurate intraocular lens (IOL) power prediction for high myopes is crucial. Advanced formulas like Barrett Universal II and Olsen improve refractive outcomes in long eyes, enhancing cataract surgery results.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Cataract surgery in high myopes presents unique challenges.
  • Standard third-generation intraocular lens (IOL) formulas often result in hyperopic refractive outcomes in these patients.
  • Postoperative accuracy is critical for patient satisfaction and visual function.

Purpose of the Study:

  • To review and compare the accuracy of various intraocular lens (IOL) formulas for predicting refractive outcomes in high myopes.
  • To identify lens formulas and adjustments that improve postoperative accuracy in cataract surgery.
  • To address the persistent hyperopic refractive errors observed even with advanced measurement techniques.

Main Methods:

  • Review of postoperative refraction results compared with predicted refractions.
  • Evaluation of standard (Holladay 1, SRK/T, Hoffer Q, Haigis) and fourth-generation (Barrett Universal II, Holladay 2, Olsen) IOL formulas.
  • Comparison of different constant adjustment methods: manufacturers' optical lens constants, User Group for Laser Interference Biometry (ULIB) constants, and axial length adjustment methods.

Main Results:

  • Optical interferometry has largely resolved axial length measurement errors.
  • Consistent hyperopic errors persist with standard formulas and constants.
  • Fourth-generation formulas and specific constant adjustments show improved predictive accuracy.

Conclusions:

  • Formulas like Barrett Universal II, Haigis (ULIB), SRK/T, Holladay 2, and Olsen (software constants) provide improved predictions for long eyes (axial length > 26.0 mm) with higher IOL powers (> 6.0 D).
  • For long eyes with lower IOL powers (< 6.0 D), Barrett Universal II (software constants), Haigis (axial length adjusted), and Holladay 1 (axial length-adjusted) are recommended.
  • Optimized formula selection and constant adjustments are key to achieving accurate refractive outcomes in high myopes undergoing cataract surgery.