The farsighted eye can usually see objects in the distance clearly, but near objects appear blurry.
在有远见的眼睛通常可以看到远处的对象明确，但附近的物体变得模糊。
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.
眼睛尽力用这个反馈系统，达到理想的视力长度，不是远视也不是近视，这个状态就称正常视力。
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.
眼睛尽力用这个反馈系统，达到理想的视力长度，不是远视也不是近视，这个状态就称正常视力。
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