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[Changes in refraction after cataract extraction and IOL implantation].

G Yan1, Y Z Zhang

  • 1Department of Ophthalmology, Beijing Hospital.

[Zhonghua Yan Ke Za Zhi] Chinese Journal of Ophthalmology
|May 1, 1990
PubMed
Summary

Cataract surgery using extracapsular extraction and posterior chamber intraocular lens (IOL) implantation leads to significant early astigmatism changes. Astigmatism stabilizes but continues to shift in axis over time post-surgery.

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Biomedical Engineering

Background:

  • Cataract extraction with posterior chamber intraocular lens (IOL) implantation is a common procedure.
  • Understanding post-operative refractive changes, particularly astigmatism, is crucial for visual outcomes.

Purpose of the Study:

  • To analyze the longitudinal changes in refraction after extracapsular cataract extraction and posterior chamber IOL implantation.
  • To quantify spherical and astigmatic variations and their axis orientation over time.

Main Methods:

  • Prospective follow-up of 61 eyes after cataract surgery.
  • Measurement of refraction, including spherical power and cylinder power/axis, at multiple time points (1 week to 3 years).

Main Results:

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  • Spherical power variations were not statistically significant during the follow-up period.
  • Significant changes in astigmatism were observed by the first week post-surgery (mean cylinder 4.21 D, 82% with-the-rule axis).
  • Astigmatism reduced and stabilized by 3 months (mean cylinder 1.90 D, 65.6% against-the-rule axis), with continued axis changes thereafter.

Conclusions:

  • Extracapsular cataract extraction with posterior chamber IOL implantation induces significant early astigmatic shifts.
  • Post-operative astigmatism tends to stabilize in magnitude but may continue to change in axis orientation over longer periods.