defective sight

• 视觉缺陷

defective sight的用法和样例：

例句

1. A person is blind to the extent that he must devise alternative techniques to do efficiently those things he would do with sight if he had normal vision.
   一个人只有在大量使用特殊技能弥补视觉缺陷时，才能被视为真正的盲人。