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要約 目的:初診時より30年以上の経過を追った571眼での他覚的屈折の変化の報告。対象と方法:眼科の1診療所で30年以上の経過を観察した294名571眼を対象とした。白内障,緑内障,強度乱視などの症例は除外した。調節麻痺状態で全例を他覚的屈折計で検査した。初診時年齢は1~59歳で,240眼(42%)が18歳未満,156眼(27%)が40歳以上であった。全例を初診時年齢により7群に分け,30年間の屈折の変化を検索した。結果:18歳未満の240眼では,30年後の屈折が217眼(90%)で近視側に変化した。40歳以上の156眼では,30年後の屈折が99眼(63%)で遠視側に,40眼(26%)で不変,17眼(11%)で近視側に変化した。19~29歳までの年齢層では,屈折はほぼ安定していた。結論:30年間の観察で,近視化の傾向は初診時年齢が18歳までは高く,30歳を過ぎると遠視化の傾向が生じた。
Abstract. Purpose:To report changes in refraction in 571 eyes over a period of 30 years or longer. Cases and Method:This retrospective study was made on 571 eyes of 294 persons followed up in an eye clinic for 30 years or longer. Cases were excluded including cataract,glaucoma or high astigmatism. All the eyes were examined using a refractometer under cycloplegia. The age at initial examination ranged from one to 59 years. A total of 240 eyes(42%)were under 18 years of age and 156 eyes(27%)were over 40 years of age. Cases were divided into 7 groups according to the initial age for analysis. Results:Refraction shifted towards myopia in 217 out of 240 eyes(90%)who were 18 years or less initially. Refraction shifted towards hyperopia in 99 out of 156 eyes(63%)who were 40 years or older initially,remained unchanged in 40 eyes(26%),and shifted towards myopia in 17 eyes(11%). Conclusion:After follow-up for 30 years or longer,tendency towards myopia was present in persons aged 18 years or younger initially. Tendency towards hyperopia became apparent in persons aged 30 years or more initially.
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