唉,视力好的人常常看不到眼前的东西,我想是他们要看的东西太多了吧。
Because the changes are painless and gradual, people often only realize they have a problem when their eyesight finally begins to fail.由于这些病变不产生痛感且逐渐形成,人们通常只是在视力最后开始丧失时才意识到有问题。
His eyesight was beginning to fail.他的视力开始减退。