後部硝子体剥離の発症年齢と屈折度との関係

Age of onset and refractive error in posterior vitre-ous detachment

　後部硝子体剥離PVDの発症年齢と屈折度の関係について，PVD発症の時期を明確にできた818眼を対象にして検討した。対象は，屈折異常以外，いかなる網膜硝子体病変もないものに限定した。その結果，PVD発症年齢は屈折度と相関があり，単回帰式は，年齢＝0.86×Dioptor＋61.21であった。発症年齢の男女差は，女が男より若かった。発症年齢の左右差は，なかった。主訴は，飛蚊症が多数であった。網膜出血や硝子体出血が，併発症として見られた。PVD発症年齢は，近視の強さに従い若くなり，正視で61歳，−5Dで57歳，−10Dで53歳，−20Dで44歳，−30Dで35歳と計算された。

We evaluated the relationship between the age of onset and refractive error in posterior vitreous detachment in 818 eyes, 700 patients. The series comprised 198 eyes of 171 males and 620 eyes of 529 females seen during a 12-year period. Eyes with vitreoretinal diseases other than myopia were ex-cluded. Diagnosis was made with Goldmann 3-mirror lens or +90D lens with slitlamp biomi-crocope. In the diagnosis of partial or complete posterior vitreous detachment, we followed the diagnositic criteria of sheet-like structure, ascen-sion phenomenon or whip-lash phenomenon in the vitreous cavity.

There was a positive correlation between the age of onset, Y, and refractive error, X, with the regres-sion line: Y=0.86X+61.21 and the correlation co-efficient of 0.400 (p＜0.01). The age of onset aver-aged 61.6 years for males and 60.6 for females. The difference was significant (p＜0.05). There was no correlation between the laterality of posterior vitre-ous detachment and age of onset. According to the above regression line, the estimated age of poste-rior vitreous detachment will be 61 years in eyes with emmetropia, 57 in eyes with myopia of -5D, 53 in -10D, 44 in -20D and 35 in -30D.