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Astigmatism evaluation prior to cataract surgery.

Pankaj C Gupta1, Jane T Caty

  • 1University Hospitals Eye Institute, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA.

Current Opinion in Ophthalmology
|October 31, 2017
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Summary

Recent advancements in astigmatism assessment, including updated toric calculators and topographic evaluations, improve accuracy for cataract surgery lens selection. These innovations enable better outcomes, even for patients with keratoconus requiring toric intraocular lenses (IOLs).

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Cataract Surgery

Background:

  • Accurate astigmatism assessment is crucial for successful cataract surgery outcomes.
  • Toric intraocular lenses (IOLs) correct astigmatism but require precise pre-operative measurements.
  • Previous methods sometimes led to unplanned residual astigmatism.

Purpose of the Study:

  • To review recent literature (past 18 months) on astigmatism assessment advancements before cataract surgery.
  • To identify improvements and challenges in pre-operative astigmatism evaluation.
  • To summarize the impact of new technologies on IOL selection and patient outcomes.

Main Methods:

  • Literature review of studies published within the last 18 months.
  • Analysis of advancements in toric calculators and regression formulas.
  • Evaluation of improvements in topographic corneal keratometry assessment.
  • Review of techniques for measuring posterior corneal astigmatism.

Main Results:

  • New toric calculators and regression formulas enhance the accuracy of IOL selection.
  • Improved topographic evaluation reduces unplanned residual corneal astigmatism.
  • Measurement of posterior corneal astigmatism is vital for keratoconus patients considering toric IOLs.
  • New methods allow toric IOL implantation in previously unsuitable keratoconus patients.

Conclusions:

  • Enhanced astigmatism evaluation using corneal point reflections and advanced toric formulas improves accuracy.
  • Integration of posterior corneal astigmatism, predicted lens position, and IOL spherical power optimizes outcomes.
  • These advancements facilitate the use of toric IOLs in keratoconus patients, expanding treatment options.