プリズム眼鏡と半側パッチ眼鏡の作用（効果）について健常者における比較研究—基礎的介入研究

Fundamental research comparing prism and right half-field eye patched glasses in normal subjects

要旨：本研究の目的は，左半側空間無視患者へ用いるプリズム眼鏡と半側パッチ眼鏡の作用を健常成人にて比較検討することである．健常成人13名をプリズム眼鏡群と半側パッチ眼鏡群に分け短・長期介入を実施した．作用判定には，左側での視線移動角度変化と内在的空間の中心指標として立位時の重心（荷重中心）位置を測定した．結果，短・長期介入終了後，プリズム眼鏡群にて左側での視線移動は拡大し持続性も示されたが半側パッチ眼鏡群では有意な拡大は見られなかった．重心（荷重中心）でも，プリズム眼鏡群では左側へ有意な移動と持続性が確認されたが半側パッチ眼鏡群では右側への移動傾向が示された．プリズム眼鏡には無視症状改善への有効性が示唆された．

　The purpose of this study was to investigate the effects of two types of glasses (prism and right half-field eye patched glasses) on normal subjects. The subjects were 6 normal adults with a mean age of 20.2 + 0.9 (prism intervention group), and 7 normal adults with a mean age of 20.9± 1.3 (right half-field eye patched glasses intervention group). Short-term (one time) and long-term (8 weeks) intervention using these two types of glasses was performed. Eye movement on the left side, and the center of gravity as an index of subjective internal midline (internal map or postural) bias were measured before and after intervention. Eye movement increased significantly on the left side and this increase lasted 4 weeks after short- and long-term prism intervention, but not after eye patch intervention. The center of gravity shifted significantly to the left after long-term prism intervention. The other hand, the center of gravity tended to move to the right side after long-term eye patched glasses intervention. Our findings suggest that prism glasses might be a more efficacious intervention than right half-field patched glasses for patients with unilateral spatial neglect.