30. The difference between correcting nearsightedness and farsightedness depends on the ______________.
(A) marking of the cornea with ink
(B) pressure exerted by the suction ring
(C) repositioning of the cornea flaps
(D) way that the cornea is either cut or trimmed

答案：登入後查看
統計： A(3), B(6), C(7), D(37), E(0) #2671430

詳解 (共 1 筆)

#4783156

第二段結尾幾句可以看出線索：

A computer guides the laser as it reshapes the cornea. To correct farsightedness, a piece of tissue shaped like a doughnut ring is removed. If the cornea’s center is trimmed, thereby making it flatter, nearsightedness is corrected. The hinged flap is then put back in position. 

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