suffered permanent eye damage
... 视力vision 视力永久受损suffered permanent eye damage 视神经optic nerve ...
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只有百分之十八视力严重受损的人永久失明，大部分盲人能够区分光明和黑暗。
Only 18 percent of people who have visual impairments are totally blind. Most are able to differentiate between light and dark.
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