a. Eye surgeons perform delicate operations with the use of magnifying lenses.
b. The pupil is the round aperture in the iris of the eye; it contracts and expands in relation to the amount of light.
c. Tiny, transparent rings tat are implanted into the cornea might correct mild to moderate nearsightedness.
d. Most children in the United States have their eyes tested by the time they are in the third or fourth grade.