Surgically induced astigmatism after micro and small clear temporal corneal incision in cataract surgery
Tagawa, K.; Higashide, T.; Sugiyama, K.; Kawasaki, K.
Nippon Ganka Gakkai Zasshi 111(9): 716-721
2007
ISSN/ISBN: 0029-0203 PMID: 17907465 Document Number: 605897
Purpose : To compare surgically induced astigmatism among 3 sizes of temporal corneal incisions in cataract surgery.Patients and Methods : A retrospective review was carried out of case records of 48 patients(64 eyes) who underwent cataract surgery. The length of the corneal incision was 1. 6 mm in five eyes, 2.2 mm in 33 eyes, and 3.0 mm in 26 eyes. Astigmatism was measured by keratometry readings before and 1 week, 1 month, and 3 months after surgery. Surgically induced astigmatism was calculated by vector analyses using the Cravy method.Results : One week postoperatively, the mean surgically induced astigmatism was 0.00 +/- 0.69 diopter(D) in the 1.6 mm group, -0.05 +/- 0.61 D in the 2.2 mm group and 0.44 +/- 0.57 D in the 3. 0 mm group. Three months; after surgery, the mean surgically induced astigmatism was - 0.050 +/- .08 D in the 1. 6 mm group, - 0.04 +/- 0.47 D in the 2.2 mm group and 0.47 +/- 0.59D in the 3.0 mm group. The surgically induced astigmatism was significantly less in the 2.2 mm group than in the 3.0 mm group.Conclusion : The amount of induced astigmatism was significantly less in temporal corneal micro-incision cataract surgery than in small incision surgery.