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晶狀體病變包括白內障﹑晶狀體脫位﹑晶狀體先天畸形﹑無晶狀體眼。晶狀體疾病均會引起視力障礙。晶狀體位于虹膜﹑瞳孔與玻璃體之間﹐形如凸透鏡﹐完全透明。藉晶狀體懸韌帶與睫狀體聯系以固定其位置。晶狀體具有屈折光線的功能﹐屈光力很強(約為+17 D)﹐是屈光間質的重要組成部分﹐并和睫狀體共同完成眼的調節功能。在睫狀肌收縮時﹐晶狀體藉其本身的彈性而增加其屈光度﹐以便看清近處物體。此外晶狀體還有濾過效應﹐可吸收紫外線﹐以保護視網膜免受輻射性損傷。
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