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Femtosecond intrastromal treatment reduces astigmatism after RLE, LASIK
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CHICAGO – An intrastromal femotsecond laser procedure safely and effectively reduced astigmatism after previous refractive surgery, according to a study presented here.
“The initial results of intrastromal femtosecond astigmatic keratotomy show that it can safely reduce low to moderate levels of astigmatism,” Steven C. Schallhorn, MD, said at the American Society of Cataract and Refractive Surgery annual meeting. “It can be titrated. There is no change in spherical equivalent. The correction ratio indicates undercorrection, but it appears stable between 1 and 3 months, at least in this initial evaluation.”
The study included 122 eyes of 105 patients whose average age was 58 years.
Most patients had undergone previous refractive lens exchange or LASIK and had residual postoperative mixed astigmatism. Astigmatic keratectomy was performed from a few months to 2 years after previous refractive surgery.
An ISAK nomogram was used to assess all eyes. The IntraLase femtosecond laser (Abbott Medical Optics) was used in all cases.
Study results showed that mean cylinder was reduced from -1.28 D preoperatively to -0.60 D at 3 months. There was no change in mean spherical equivalent.
Uncorrected visual acuity improved, with 26% of eyes attaining 20/16 and 52% seeing 20/20 at 3 months. Results showed no change in mean best corrected visual acuity; no eyes lost more than two lines of vision, Dr. Schallhorn said.
- Disclosure: Dr. Schallhorn is a consultant for Abbott Medical Optics.