強度近視眼のLR-SRバンドと眼球運動障害との関係

Relation between impaired ocular motility and the band connecting superior and lateral rectus muscles in eyes with high myopia

要約　目的：強度近視眼を対象に外・上直筋プリーを連結する眼窩結合組織（LR-SRバンド）の形態と外転障害との関係の報告。対象と方法：正中位よりも外転が可能な軽度の外転障害群14眼，正中位まで外転しない重度の外転障害群10眼，外転障害のないコントロール群10眼を対象にMRIを用いた眼窩撮像画像から外転障害の程度とLR-SRバンドの性状とを比較した。結果：軽度障害群の14眼（100％），重度障害群の10眼（100％），コントロール群の9眼（90％）に，LR-SRバンドの耳上側への偏位，菲薄化，連続性の欠如を認めた。結論：強度近視眼では外転障害の程度に関係なくLR-SRバンドに形態異常がみられる。

Abstract.　Purpose：To report the band connecting the superior and lateral rectus muscles in eyes with high myopia and its role in impaired ocular motility. Cases and Method：This study was made on 34 eyes with myopia greater than －8 diopters. Abduction was unlimited in 10 eyes, mildly limited in 14 eyes, and was severely limited in 10 eyes. Magnetic resonance imaging was used to visualize the orbit and the band between superior and lateral rectus muscles. Results：The band was displaced in the superior temporal direction, was attenuated, or lacked continuity in 9 eyes（90％）with unlimited abduction, 14 eyes（100％）with mildly limited abduction, and 10 eyes（100％）with severely limited abduction. Conclusion：Eyes with high myopia show abnormal morphology of the band between superior and lateral rectus muscles.