The good news: The most common diseases -- age-related macular degeneration (ARMD), cataracts, glaucoma, and dry eye disease -- are all preventable to some extent.

• 好消息是：很多疾病在一定程度上都有阻碍老年视网膜黄斑性病变、白内障、青光眼、干的眼疾病的可能性。