Optometric Technician questions with correct answers

What percentage of all Americans have eye defects or refractive errors that can be corrected with the use of spectacles, contacts 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-The Sclera What is the clear covering that lines the outer surface of the eyeball and call Vera the inner side of the eyelids is? CORRECT ANSWER-Conjunctiva 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 is the retina. True or false? CORRECT ANSWER-True The function of the lens is to bring rays of light to a sharp focus on the pupil? True or False? CORRECT ANSWER-False What is the opening in the iris that allows light to enter the eye? CORRECT ANSWER-The pupil What is the function of the Iris? CORRECT ANSWER-It 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