【单选题】【消耗次数：1】
照相机镜头的作用是调焦，等同眼睛的（）
①
A 视网膜
②
B 虹膜
③
C 晶状体
④
D 眼角膜
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眼睛老年人对光线的适应能力降低；晶状体逐渐变黄，色觉能力降低；易发生老花眼、青光眼、白内障、老年性视网膜病等现象说明老年人（ ）。
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