Weak-eyesight is a term that generally is used torefer to near-sighted eyes

游客2023-07-27 48

问题    Weak-eyesight is a term that generally is used to
refer to near-sighted eyes. People who are near-sighted can see good at       【M1】______
a short range, but nothing very far away is likely to be a dull                【M2】______
blur.
The term weak eyesight is misled, for in near-sighted eyes                【M3】______
the lens of the eye are actually too strong. The near-sighted lens             【M4】______
is so powerful that it focuses the light coming into the eye too
quick. The image is formed in front of the retina, which                      【M5】______
contains the optical nerves. Near-sightedness is common, but its                【M6】______
growth may be gradual; often the blurring of distant objects is so
slight at first that a person may recognize the condition. Near sightedness    【M7】______
is frequently discovered first at school. It is here that
a student first realizes the difficulty of seeing work on the black-board,
whereas another in the class have no trouble reading the                      【M8】______
board at all. After discovery, near-sightedness can easy be corrected.          【M9】______
A concave lens is called a "minus" lens because it
increases the power of the lens of itself.                                     【M10】______ [br] 【M7】

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