PROBLEM TO BE SOLVED: To provide a safe and effective agent for preventing and/or improving a deterioration in a regulation function of an eye.SOLUTION: The agent is a lenticular protein degeneration suppressant containing at least one kind of plant or its extract selected from broccoli, soybean, green onion, Chinese leek, apple and carrot, as an active ingredient.COPYRIGHT: (C)2013,JPO&INPIT【課題】安全で有用な眼調節機能低下予防及び/又は改善剤の提供。【解決手段】ブロッコリー、ダイズ、ネギ、ニラ、リンゴ、及びニンジンから選ばれる1種以上の植物又はその抽出物を有効成分とする水晶体蛋白変性抑制剤。【選択図】なし