Age-related cataracts can start as early as the 40s, but it is most often after age 60 that such clouding of the lens begins to affect vision.
与年龄相关的白内障有可能在四十几岁开始，不过六十岁以后，这种影响视力的晶状体混浊现象最常见。
Slight amounts of astigmatism usually don't affect vision and don't require treatment.
轻微的散光不会影响到视觉，也无需治疗。
Not only does corneal neovascularization seriously affect vision, but also leads to corneal transplantation failure.
角膜新生血管不但严重影响视力，而且导致角膜移植手术的失败。
Cataract: Opacity of the eye's crystalline lens. Cataracts causing central visual-field defects are most likely to affect vision.
白内障：表现为眼内水晶体混浊的眼科病。白内障导致的视野缺损多半会损害视力。
Cataract: Opacity of the eye's crystalline lens. Cataracts causing central visual-field defects are most likely to affect vision.
白内障：表现为眼内水晶体混浊的眼科病。白内障导致的视野缺损多半会损害视力。
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