Optometric Technician questions with correct answers

Approximately what percentage of all Americans have eye defects or refractive errors than can be corrected with the use of spectacles, contact lenses, or surgery CORRECT ANSWER-60% What is the name of the tough white covering of the eyeball that is often referred to as the White of the eye CORRECT ANSWER-sclera What is the name of the innermost membrane lining located at the back of the eye which is comprised of nerve fibers and functions like the film in a camera CORRECT ANSWER-retina what is the function of the lens CORRECT ANSWER-to bring rays of light to a sharp focus on the pupil What is the opening in the iris that allows light to enter the eye? CORRECT ANSWER-pupil the clear covering that lines the outer surface of the eyeball and covers the inner side of the eyelids is the CORRECT ANSWER-conjunctiva What is the function of the iris CORRECT ANSWER-controls the amount of light entering the eye when light rays are unable to come to a single focal point on the retina because of different focal lengths in different meridians of the eye, the eye is said to be CORRECT ANSWER-astigmatic