sight的反义词

是blindness ，中文意思是n. 失明无知盲区

The fact is blindness hadn't stopped the children from doing many of the things that sighted children enjoy.总而言之，失明并没有阻止这些孩子做有视力儿童喜爱做的许多事情。

What exactly is colour-blindness and how do you find out if you have it?

到底什么是色盲症，你又是怎么发现自己有色盲症的