Weak eyesight is a term that is generally 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 lenses of the eyes are actually too strong The near-sighted lens
are so powerful that it focuses the light coming into the eye too 【M4】__________.
quick. The image is formed in front of the retina, which contains 【M5】__________.
the optical nerves, Near-sightedness is common, but its growth may 【M6】__________.
be gradual. Often the blurring of distant objects is so slight at first
that a person may recognize the condition. Near-sightedness is 【M7】__________.
frequently discovered first at school. It is here that a student first
realizes, the difficulty of see work on the blackboard, whereas 【M8】__________.
another in the class have no trouble reading the board at all. 【M9】__________.
After discovery, near-sightedness can easily be corrected. A concave
lens called a "minus" lens because it increases the power of the 【M10】__________.
lens of the eye itself is the prescription.
【M1】