Large, dense cataracts present from birth in the middle of the lens that affect only one eye are more likely to cause permanent vision loss.
若白内障较大而致密，且位于一侧眼球的晶体正中，这种情况更容易造成永久性的视力丧失。
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Coastal Contacts, one of the largest online contact-lens retailers in North America, came out of its two-day planning session at a loss for how to rev up growth.