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要約 目的:原発閉塞隅角症と原発閉塞隅角緑内障での隅角の形状と機能的隅角閉塞の報告。対象と方法:原発閉塞隅角症または原発閉塞隅角緑内障がある143眼を対象とした。平均年齢は74歳である。超音波生体顕微鏡で隅角の4方向を明室と暗室で測定し,隅角の形状と機能的隅角閉塞を評価した。結果:2象限以上に及ぶプラトー虹彩の頻度は,レーザー虹彩切開を行っていない86眼では14%,行ってある68眼では21%であった。水晶体前進の頻度は,それぞれ6%と34%であった。2象限以上の機能的隅角閉塞の頻度は,それぞれ44%と35%であった。結論:原発閉塞隅角症と原発閉塞隅角緑内障では,プラトー虹彩と水晶体前進が,隅角形状の異常と機能的隅角閉塞とに高頻度に関与している。
Abstract. Purpose:To report the shape and functional closure of chamber angle by ultrasound biomicroscopy of primary angle-closure with or without glaucoma. Cases and Method:This study was made on 143 eyes of primary angle-closure with or without glaucoma. The age averaged 74 years. An ultrasound biomicroscope was used to measure the chamber angle in 4 quadrants in illuminated and dark rooms to assess the shape of chamber angle and functional angle-closure. Results:Incidence of plateau iris over 2 quadrants was 14% in 86 eyes that did not receive laser iridotomy(LI)and 21% in 68 eyes after LI. Incidence of anterior displacement of crystalline lens was 6% and 34% respectively. Incidence of functional angle-closure over 2 quadrants was 44% and 35% respectively. Conclusion:Plateau iris and anterior displacement of the lens are frequently associated with abnormal shape of chamber angle and functional angle-closure.
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