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Overcorrection After Excimer Laser Treatment of Myopia and Myopic Astigmatism
Rasik B. Vajpayee, MBBS, MS;
Catherine A. McCarty, PhD;
Geoffrey Aldred;
Hugh R. Taylor, MD, FRACO;
Melbourne Excimer Laser Group
Arch Ophthalmol. 1996;114(3):252-256.
Abstract
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Objective
To study the incidence and associations of overcorrection after excimer laser treatment of myopia and myopic astigmatism.
Methods
The study cohort consisted of 645 patients who had photorefractive or photoastigmatic refractive keratectomy done by an excimer laser during a 2-year period. Patients were assessed 1,3,6, and 12 months post-operatively. The variables evaluated were visual acuity, refraction, keratometry, and corneal clarity.
Results
At 1 month, overcorrection of more than +1 diopter spherical equivalent (SEQ) was seen in 22% of the eyes. This progressively regressed so that only 8.6% of the 140 eyes that were overcorrected at 1 month were overcorrected at 1 year. Overall, 2.2% of eyes were overcorrected at 1 year. The magnitude of attempted correction and use of topical nonsteroidal anti-inflammatory drugs disclosed a notable association with occurrence of overcorrection at 1, 3, and 6 months. The use of bandage contact lenses also was associated with overcorrection at 1 and 3 months. After controlling for myopia and use of contact lenses, the odds of overcorrection for use of topical nonsteroidal anti-inflammatory drugs at 1,3, and 6 months were 2.21 (95% confidence limits [CL]=1.49, 3.44), 1.69 (95% CL=0.88, 3.24), and 2.01 (95% CL=0.88,4.56), respectively. The odds of overcorrec tion with bandage contact lenses were 1.79 (95% CL=1.05, 3.05) at 1 month and 2.42 (95% CL=1.23,4.75) at the end of 3 months. No associations were seen between overcorrection and age, gender, surgical technique, or simultaneous astigmatic corrections.
Conclusions
Overcorrection is common during the early postlaser treatment period and is associated with degree of myopia, use of nonsteroidal anti-inflammatory drugs, and bandage contact lens wear.
Author Affiliations
From the Department of Ophthalmology, The University of Melbourne, Victoria, Australia.
Footnotes
The members of the Melbourne Excimer Laser Group are listed in the acknowledgment section at the end of this article.
The authors have no proprietary interest in the development or marketing of the VisX excimer laser or a competing laser.
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ABSTRACT
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