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Childhood blindness is an important cause contributing to the burden of blindness. Blindness in children can be defined as a visual acuity of <3/60 in the eye with better vision of a child under 16 years of age. This means, generally, that the child cannot see something three feet (about one meter) away that another child could see if it was 60 feet (about 20 meters) away. ==Causes== There are many causes of blindness in children. Blindness may be due to genetic mutations, birth defects, premature birth, nutritional deficiencies, infections, injuries, and other causes. Severe retinopathy of prematurity (ROP), cataracts and refractive error are also causes. The most frequently affected parts of the eyes are: * the whole globe (36%) * cornea (36%) * lens (11%) * retina (6%) * optic nerve (5%) * uvea (2%) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「childhood blindness」の詳細全文を読む スポンサード リンク
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