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エキシマレーザー屈折矯正術(photorefractive keratectomy:PRK)後の矯正誤差に影響を及ぼす臨床因子を明らかにするため,東京大学でPRKを施行した37例48眼について術後6か月,12か月の時点での矯正誤差量に対して重回帰分析による検討を行った。目標矯正度数に対する矯正誤差は術後6か月の時点で−0.25±0.96D (平均±標準偏差),術後12か月で−0.50±1.07Dであり,目標矯正度数の±1D以内の症例はそれぞれ37眼(77%),32眼(67%)であった。重回帰分析の結果,矯正誤差と有意な関連因子は,術後6か月,12か月ともに年齢(各p=0.02,p=0.04)および球面矯正量(各p=0.02, p=0.009)であり,年齢が若いほど,また,球面矯正量が大きいほど術後屈折値が近視側に有意に偏位する傾向がみられた。
We performed excimer laser photorefractive keratectomy on 48 eyes of 37 patients. The spherical equivalent of refractive errors was evaluated at 6 and 12 months after surgery. We also investigat-ed the risk factors for refractive errors of the intended final refraction by using multiple regression analysis. Refractive errors were -0.25±0.96D (mean±SD) at 6 months and -0.50±1.07D at 12 months after surgery. At 6 and 12 months, age (p=0.02 and 0.04) and spherical correction (p=0.02 and 0.009) were identified as significant risk factors for refractive errors. Myopic regression after surgery tended to be more pronounced in younger persons and in eyes with high spherical corrections.
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