In severe cases, keratitis can lead to corneal scarring, vision loss and complete blindness.

在严重的情况下，角膜炎可以导致角膜瘢痕、 视力下降和完全失明。

This group of rare, genetic disorders, which involves the loss of light-sensitive cells in the retina, affects more than 2 million people worldwide, and can lead to complete blindness.

这组罕见的遗传性疾病涉及视网膜中光敏细胞的丧失，影响全世界超过 200 万人， 并可能导致完全失明。