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P.A. Asbell, CK Presbyopia Study Group; The Treatment of Presbyopia with Conductive Keratoplasty (CK): 9 Month Results . Invest. Ophthalmol. Vis. Sci. 2003;44(13):2566.
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Purpose: To determine the safety and effectiveness of using CK to treat presbyopia by inducing monovision. Methods: In a multicenter trial, 76 presbyopic eyes (70 patients) were treated with CK and followed for up to 9 months. Seventy eyes were treated to improve near vision (induce a mild myopia), and 6 eyes were treated to improve distance vision. The range of treatment was +1.61 D +/- 0.63 for the eyes treated for near vision. Results: In the 70 eyes treated for near, post-op at 6 mo.(N=39) and 9 mo.(N=36), respectively, near UCVA was J1 or better in 51% and 45%, J2 or better in 74% and 72%, and J5 or better in 92% and 89%. Accuracy from target at 6 and 9 mo., respectively, was 64% and 63% within +/-0.50 D, and 89% and 93% within +/-1.00 D. Binocular UCVA for distance and near was 20/20 or better together with J2 or better in 72% at 6 and 9 mo. and 20/25 or better with J3 or better in 90% at 6 mo. and 86% at 9 mo. Refractive stability was achieved by 6 months. No eye lost 2 or > lines of BCVA or had induced cylinder > 2 D. Data on 125 eyes will be available for the presentation. Conclusions: The data suggest CK may be a very effective and safe treatment for presbyopia when performed in one eye to induce monovision.
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