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Weak-eyesight is a term that generally is used torefer to near-sighted eyes
Weak-eyesight is a term that generally is used torefer to near-sighted eyes
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2023-07-27
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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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