網膜神経厚解析装置を用いた視神経乳頭計測

Morphometry of the optic disc using a nerve fiver analyzer

　日本人50例70眼について，視神経乳頭の形状と性差を検索した。網膜視神経厚解析装置を用い，乳頭の縦径と横径，乳頭面積などを計測した。男性34眼，女性36眼であり，年齢は23歳から83歳，平均62歳である。51眼については眼軸長を測定し，平均値は男性25眼で23.7±1.1mm，女性26眼で23.1±1.6mmであり，有意差はなかった（p＝0.26）。乳頭の縦径には男女差はなく（p＝0.24），横径は女性よりも男性で有意に大きかった（p＝0.03）。縦径と横径の差は男性で有意に大きく（p＝0.06），横径：縦径の比は男性で大きかった（p＝0.09）。これらの結果から，乳頭の形状には性差があり，女性の乳頭がよリ楕円形に近い可能性がある。

Morphometry of the optic disc was performed on 70 eyes of 50 Japanese. A nerve fiber analyzer was used to measure the disc size and shape with particular attention to sex differences. The series com-prised 34 male eyes and 36 female eyes. Their ages ranged from 23 to 83 years, average 62 years. The axial length averaged 23.7±1.1 mm in 25 male eyes and 23.1±1.6 mm in 27 female eyes. There was no difference between both sexes (p=0.26). There was no difference in vertical disc diameter between both sexes (p= 0.24). The horizontal disc diameter was significantly larger in males than in females (p=0.03). The value of vertical minus horizontal disc diameter was greater in males (p=0.06). The ratio of horizontal/vertical disc diamter was greater in males (p=0.09). The findings suggest that the size of the optic disc is different be-tween males and females and that the optic disc is more oval-shaped in females.