(of water, air, or glass)make (a ray of light) change direction when it enters at an angle
(水、空气或玻璃)使(光线)折射
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the rays of light are refracted by the material of the lens .光线经镜片材料而折射。
measure the focusing characteristics of (an eye) or of the eyes of (someone)
测定眼睛的屈光度,验光。
"early 17th cent.: from Latin