This feedback system is used by the eye in an effort to attain an ideal eye length, neither farsighted nor nearsighted. This state is called emmetropia.
2
终年对峙，可使眼睛运转灵敏，去内障外翳，兼能矫正近视、远视。
All the year round confrontation, can make an eye movement sensitivity, to cataract and pannus, and correction of myopia, hyperopia.
3
当眼睛的形状是太短的，远视或者远视，发生。
Hyperopia, or farsightedness, occurs when the shape of the eye is too short.
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