原発閉塞隅角症疑いにおける前房深度と水晶体の関係

Relation between anterior chamber depth and the lens in primary angle closure suspect

要約　目的：原発閉塞隅角症疑い（PACS）における前房深度（ACD）と水晶体の関係についての検討。

対象と方法：対象は細隙灯検査，隅角検査，光学式眼軸長測定装置（OA-2000）で眼軸長を測定した正常眼圧症例201例366眼。対象をvan Herick法grade 2以下のPACSでACD 2.0mm未満を1群，2.0mm以上を2群，コントロール群を3群に分類した。水晶体厚などの水晶体因子パラメータを定めてその群間差，ACDと水晶体因子パラメータとの相関を検討した。

結果：平均年齢は各群間で有意差はなかった。1，2群間ですべての水晶体因子パラメータで有意差があった（p＜0.01）。ACDと水晶体因子パラメータの間に相関があった。

結論：光学式眼軸長測定は閉塞隅角疾患の診療に有用であり，1群は水晶体因子が強く，PACSのなかでも急性緑内障発作を生じるリスクが高い可能性がある。

Abstract　Purpose：To present a report on the relation between anterior chamber depth and the lens in primary angle closure suspect（PACS）.

Cases and Method：This study was made on 366 eyes of 201 cases who received routine examination including measurement of axial length. The age averaged 72.6±7.3 years. Intraocular pressure was within normal range in all the eyes. These eyes were classified into 3 groups after van Herick. Group 1 had axial length less than 2.0 mm（52 eyes）. Group 2 had axial length equal to or more than 2.0 mm（74 eyes）. Group 3 served as control（240 eyes）.

Results：There was no difference among the 3 groups regarding age. All the parameters regarding the lens were significantly different between group 1 and group 2（p＜0.01）. These parameters were significantly correlated with anterior chamber depth.

Conclusion：Measurement of the axial length is useful in the diagnosis and treatment of primary angle closure disease. Eyes in group 1 showed high correlations with the lens factors. These eyes had also a high risk of angle closure.