Farsightedness (hyperopia .: syn) - the lack of an optical eye, in which impaired the ability to see clearly at close distances. When this focus rays from the subject under consideration, after refraction of the eye lies behind the retina. Hyperopia occurs in about 50% of adults. Its causes may be the relative weakness of the refractive apparatus of the eye, short anteroposterior axis of the eye. The relatively high visual acuity of people with hyperopia is due to stress accommodation of the eye. Due to this constant voltage accommodation farsightedness in full does not occur (latent hyperopia). With age, due to the weakening accommodative ability of the eye hidden farsightedness becomes apparent. Since the far-sightedness is a constant tension of accommodation, in the absence of correction of hyperopia easily develop eye fatigue, manifested by headache, dull pain in the forehead and eyeballs.
Diagnosis can be made in the process of visual acuity in the study using special optical lenses. The degree of farsightedness is determined by the strongest of the collecting lens, which gives the best vision. This method is called subjective, since it is necessary to take into account the estimates of the examinee. Objective determination of the degree of farsightedness is carried out using a refractometer. Correction of hyperopia is made convex glass, reinforcing refraction.