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Related Experiment Videos

Toric intraocular lenses: correcting astigmatism while controlling axis shift

K Shimizu1, A Misawa, Y Suzuki

  • 1Department of Ophthalmology, Musashino Red Cross Hospital, Tokyo, Japan.

Journal of Cataract and Refractive Surgery
|September 1, 1994
PubMed
Summary

Toric intraocular lenses (IOLs) effectively correct astigmatism after cataract surgery. For best results, ensure the toric IOL axis shift is less than 30 degrees post-implantation.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Astigmatism correction is crucial for visual acuity after cataract surgery.
  • Toric intraocular lenses (IOLs) are designed to correct pre-existing astigmatism.

Purpose of the Study:

  • To evaluate the efficacy of toric IOLs in patients with against-the-rule astigmatism.
  • To determine the impact of lens axis shift on visual outcomes.

Main Methods:

  • 47 patients with against-the-rule astigmatism received toric IOLs (2.00 D or 3.00 D) after phacoemulsification.
  • Visual acuity and lens axis position were assessed three months postoperatively.

Main Results:

  • 77% of patients achieved 20/25 or better best corrected visual acuity.
  • 3.00 D IOLs showed better outcomes than 2.00 D IOLs when axis shift was < 30 degrees.

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  • Axis shifts > 30 degrees negatively impacted outcomes.

    • Conclusions:

    • Toric IOLs are effective for correcting astigmatism in cataract surgery patients.
    • Limiting lens axis shift to less than 30 degrees is critical for optimal visual outcomes.