Maybe you fall asleep in class because of uncorrected astigmatism.也许你在课堂上睡觉是因为你的眼睛散光.They have what is called astigmatism.他们有所谓散光.Under astigmatism even narrow parallel light beams will not combine into one point.有象散存在时甚...
Astigmatism can occur in addition to nearsightedness and farsightedness.散光可发生在除近视和远视.Maybe you fall asleep in class because of uncorrected astigmatism.也许你在课堂上睡觉是因为你的眼睛散光.They have what is called astigmatism.他们有所谓散光.Anast...