它是诊断包括青光眼在内的眼部疾病的不可或缺的工具。除此之外，它还可以被用来拍摄到可以导致糖尿病人使失明的糖尿病视网膜病变情况。
It is the indispensable tool for diagnosing diseases of the eye, including glaucoma, and is used to screen for diabetic retinopathy, a condition in diabetics that can result in blindness.
一次事故使他双目失明。
阳光又回到了失明的奶奶的生活中，使她的日子不那么黑暗和沉闷了。
Sunshine had come again into the blind woman's life, and made her days less dark and dreary.
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