INSTRUMENTS USED TO OBTAIN AND CORRECT REFRACTIVE ERROR
Refractive errors occurs when the shape of the eye prevents light emanating from infinity to form image on the retina. The length of the eyeball, changes in the shape of the cornea, or aging of the lens can cause refractive error.The most common types of refractive errors are myopia, hyperopia, presbyobia, and astigmatism. Below are the instrument used to obtain refractive status of the eye.