refract
/rɪˈfrækt/verb
with obj.(一般作be refracted)
1- (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：
the rays of light are refracted by the material of the lens.
光线经镜片材料而折射。
1.1
- measure the focusing characteristics of (an eye) or of the eyes of (someone)测定眼睛的屈光度, 验光。
词源
early 17th cent.: from Latin refract- 'broken up', from the verb refringere, from re- 'back' + frangere 'to break'.