Refractive error is a condition in which the eye in its relaxed state is unable to sharply see images due to failure of the optical system to bring parallel rays of light reflected off objects) of regard to a sharp focus on the retina. As a result, there is relatively poor vision as images of objects are seen to be blurred. There are different types of refractive errors and they include hyperopia, myopia, and astigmatism, with overlapping forms. Myopia and hyperopia are said to occur when the optical system of the eye brings parallel rays of light into focus in front and at the back of the fovea, respectively. Astigmatism on the other hand occurs when rays of light from different planes do not come to the same point on the fovea.
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