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角膜老人環之疫學的調查成績
Prevalence of Arcus Senilis of the Cornea among the Inhabitants on Pescadores
摘要
民國65年7月間，在澎湖縣調查居民之角膜老人環。對象為各年齡之男女728人。角膜老人環皆發生在30歲以上者，在此年齡之後其罹患率與年齡俱增。三十歲以上者476人中有267人，56.1%患有老人環。罹患者中之94%為兩眼性。老人環大部份從上側角膜輪部開始出現，分別沿着耳及鼻側輪部伸展，遂在下側輪部連接形成環狀。罹患者之520眼中270眼，51.9%呈示環狀；28.1%為半環狀成不完全環狀；20.0%為孤狀。
關鍵字
無資料並列摘要
A survey of arcus senilis of the carried out among the inhabitants of both sexes, young and old on Pescadores Islands. The results were summarized as follows. Of 728 individuals, were found 520 arcus senilis in 267 cases, 36.7%. No arcus senilis was found under the age below 29 years. The prevalence rates increased as the age increased. Among 115 cases with the age of 50 to 59 years were found 82 cases, 71.3% to have arcus senilis. This age group is the turn to have shown a markedly higher prevalence rate when compared with the younger group 40 to 49 years who had 24.6%, 28 among 114 cases. Of 267 cases affected was 94.4% bilateral. If divided into four quadrants, the frequency rate of occupancy among 520 arcus senilis to the sites of corneal limbus, was found the highest, 99.4%, in the upper quadrant, next to this rate the temporal and nasal sites showed respectively 79.6% and 79.0%. The lowest rate, 66.2% was found in the lower site of limbus. The shapes of the arcus senilis were arcuate, semicircular and ring shaped. Of 520 arcus senilis were 104, 20.0% arcuate; 20.8% semicircular, 7.3Yo interrupted ring, and 51.9% ring shaped. The observation indicated, in general, arcus senilis appeared first as a arcuate opacity at the upper site of the corneal limbus, then the opacity elongated along both temporal and nasal sides and finally joined together at the lower limbus forming a white ring opacity in the cornea. The etiology of the arcus senilis was discussed. It was postulated that hemodynamic differences of the blood flows at the different sites of the corneal limbus might play a role to the lipid deposition into the cornea.