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要約 目的:筆者が開発した3つのハプティクスをもつ眼内レンズ(IOL)の死体人眼での固定状態の報告。このIOLは無水晶体眼の毛様溝に無縫合で固定できる。
対象と方法:人眼用に開発した全長13.2mm,13.5mm,13.7mmの3種類のIOLを,7眼に白内障手術に準じて挿入した。その安定性を,IOL表面をフックで圧迫,外側から強膜を圧迫,IOLを挿入した眼球を高さ30 cmより落とす,の3方法で検討した。
結果:13.2mmのIOLは,1眼で十分な固定が得られなかった。13.5mmと13.7mmのIOLをそれぞれ3眼に挿入した場合には,直接または外部からの圧迫に対し,十分な安定性を示した。落下実験では,13.5mmのIOL 3眼中1眼,13.7mmのIOL 3眼中2眼で,1個のハプティクスが外れた。
結論:13.5mmと13.7mmのIOLでは,圧迫実験では十分な安定性を示したが,落下実験では成績が不十分で,改良が必要と考えられた。
Abstract Purpose:To report the status of fixation in the ciliary sulcus of a newly designed intraocular lens(IOL)in cadaver eyes. This IOL has three haptics that can be fixated in the ciliary sulcus without suturing.
Cases and Method:This experiment was made on three types of IOL that has the length of 13.2 mm, 13.5 mm and 13.7 mm respectively. These IOLs were inserted into 7 cadaver eyes simulating the procedure in cataract surgery. Safety of IOL was evaluated by 3 methods:by direct compression of IOL by a hook, by applying pressure to the sclera, and by dropping the eye from a height of 30cm.
Results:The 13.2 mm IOL failed to show sufficient fixation. Both 13.5 mm and 13.7 mm IOLs showed sufficient fixation when force was applied directly or to the sclera. The dropping test showed luxation of one haptics in one out of 3 eyes inserted with 13.5 mm IOL and in 2 out of 3 eyes inserted with 13.7 mm IOL.
Conclusion:Both 13.5 mm and 13.7 mm IOLs showed sufficient fixation by directly or indirectly applied force. Further modification appeared to be needed to improve the state of fixation when dropped from the height of 30cm.
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