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Induced astigmatism in small incision cataract surgery
1Sunrise Medical Center, Las Vegas, Nevada 89109.
Journal of Cataract and Refractive Surgery
|January 1, 1989
Summary
Small incision cataract surgery using 4.0 mm incisions resulted in minimal induced astigmatism. This confirms the advantage of small incision techniques for stable refractive outcomes after cataract surgery.
Area of Science:
- Ophthalmology
- Refractive Surgery
- Corneal Astigmatism
Background:
- Smaller cataract incisions are theorized to reduce surgically induced astigmatism.
- Stable postoperative refraction is a key goal in cataract and intraocular lens (IOL) surgery.
Purpose of the Study:
- To evaluate the astigmatic changes following cataract surgery with 4.0 mm incisions.
- To compare the induced astigmatism from small incisions with historical data from larger incisions.
Main Methods:
- Prospective analysis of 99 patients undergoing cataract/IOL surgery with 4.0 mm incisions.
- Keratometry measurements were taken preoperatively and at one week, one month, and three months postoperatively.
- Vector analysis was used to quantify astigmatic changes.
Main Results:
- Induced astigmatism was 0.13 D (with-the-rule) at one week.
- Astigmatism shifted to 0.22 D (against-the-rule) by three months.
- These results are favorable compared to larger 6.0 mm and 10.0 mm incisions.
Conclusions:
- Cataract surgery with 4.0 mm incisions induces a low amount of astigmatism.
- Small incision surgery demonstrates rapid wound stabilization and refractive stability.
- 4.0 mm incisions offer an advantage in minimizing surgically induced astigmatism.