正常眼における篩状板前面の深度と形状

Morphology and depth of anterior surface of lamina cribrosa in normal eyes

要約　目的：光干渉断層計（OCT）で測定した正常眼での篩状板前面深度の報告。対象と方法：正常人68人136眼を対象とした。男女それぞれ34人で，平均年齢は44.8±19.7歳，等価球面度数としての屈折は平均−1.98±2.92Dである。乳頭縦断面として篩状板前面の上方，中央，下方の深さを測定した。結果：篩状板の前面深度の平均は，374.9±84.9μmで，個体差が大きく，縦断面の形は中央が浅く，上下が深いWの形をしていた。左右眼の間に有意差はなく，男性では女性よりも深度が有意に大きく，年齢，屈折，眼圧，乳頭の面積との有意な相関はなかった。結論：OCTで測定した正常眼での篩状板前面深度には，大きな個体差があり，男性では女性よりも大きく，屈折とは相関しない。

Abstract.　Purpose：To report the shape and depth of anterior surface of lamina cribrosa measured by optical coherence tomography in normal eyes. Cases and Method：This study was made on 136 eyes of 68 healthy volunteers. The series comprised 34 males and females each. The age averaged 44.8±19.7 years. Refraction averaged −1.98±2.92D. Shape and depth of anterior surface of lamina cribrosa were measured as vertical section of the optic disc by optical coherence tomography. Results：Depth of anterior surface of lamina cribrosa averaged 374.9±84.9μm and showed large individual variations. When seen as vertical section, the lamina cribrosa was bent posteriorly in the superior and inferior portions simulating the letter W. Depth of anterior surface of lamina cribrosa showed no significant difference between the right and left eye, and was greater in males than females. It was not correlated either with age, refraction, intraocular pressure, or disc area. Conclusion：Depth of anterior surface of lamina cribrosa showed large individual variations. It was greater in males than females and was not correlated with refraction.