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Long-term course of surgically induced astigmatism
S C Richards1, R S Brodstein, W L Richards
1Department of Ophthalmology, University of Utah School of Medicine, Salt Lake City.
Journal of Cataract and Refractive Surgery
|May 1, 1988
Summary
Surgically induced astigmatism can change for years after cataract surgery. Controlling corneal curvature with keratometry minimizes preoperative astigmatism effects, with optimal postoperative results between 0.75-1.25 diopters.
Area of Science:
- Ophthalmology
- Surgical Outcomes
- Corneal Astigmatism
Background:
- Cataract surgery, specifically extracapsular extraction with posterior chamber lens implantation, can induce astigmatism.
- Understanding the long-term changes in surgically induced astigmatism (SIA) is crucial for visual rehabilitation.
Purpose of the Study:
- To analyze the changes in SIA following extracapsular cataract extraction and posterior chamber lens implantation.
- To determine the long-term stability of SIA and factors influencing it.
Main Methods:
- Retrospective analysis of 229 cases undergoing cataract surgery.
- Long-term follow-up averaging 34.4 months (2.87 years).
- Keratometry measurements to control corneal curvature.
Main Results:
- SIA demonstrated continued change for at least three years post-surgery.
- Preoperative astigmatism had minimal impact on postoperative astigmatism when corneal curvature was controlled.
- Optimal with-the-rule astigmatism at 3-5 weeks postoperatively ranged from 0.75 to 1.25 diopters for a specific surgical technique.
Conclusions:
- Surgically induced astigmatism is dynamic and can evolve over several years.
- Effective management of corneal curvature during surgery is key to mitigating preoperative astigmatism's influence.
- Specific postoperative astigmatism targets can be achieved with particular surgical approaches.