Stability of astigmatism over 3 years after corneal stretch incision.
OBJECTIVE
To assess long-term corneal stability of self-sealing clear corneal stretch incisions with implantation of 5 mm polymethylmethacrylate (PMMA) intraocular lenses.


METHODS
Two hundred consecutive eyes of 3500 cataract patients who had capsulorhexis, phacoemulsification, and preparation of a 1.5 to 2.0 mm corneal tunnel that had an external width of 4.0 to 4.1 mm and an internal width of 6.5 to 7.0 mm (stretch incision), and implantation of a 5 mm PMMA intraocular lens were evaluated clinically and statistically. Slit-lamp microscopy, keratometry, and corneal topography were performed preoperatively and postoperatively after 1 week, 1, 2, and 3 years.


RESULTS
The mean surgically induced astigmatism following superior corneal incision amounted to 1.59 +/- 1.06 D after 3 years; following lateral corneal incision, mean surgically induced astigmatism was 0.84 +/- 0.68 D. There were no corneal complications in the long-term follow-up study.


CONCLUSIONS
Our 5-year experience shows that the self-sealing clear corneal stretch incision in connection with implantation of a 5 mm polymethylmethacrylate intraocular lens induces approximately 1.00 D of astigmatism. We prefer the lateral incision and recommend the superior incision only for high preoperative with-the-rule astigmatism.
Müller-Jensen
K
K
Städtisches Klinikum, Augenklinik, Karlsruhe, Germany.
Buchholz
A
A
Barlinn
B
B
D001251:Astigmatism / Q000209:etiology / Q000503:physiopathology*; D019923:Capsulorhexis; D003315:Cornea / Q000503:physiopathology* / Q000601:surgery*; D019781:Corneal Topography; D005500:Follow-Up Studies; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D018918:Phacoemulsification / Q000009:adverse effects*; D019904:Polymethyl Methacrylate; D011446:Prospective Studies; D013536:Suture Techniques
D019904:Polymethyl Methacrylate