FAR-VISIBILITY ( synonym : hyperopia) is an optical defect of the eye in which the ability to see clearly at close range is impaired. In this case, the focus of the rays coming from the subject in question, after refraction in the eye, lies behind the retina. Hyperopia occurs in approximately 50% of adults. Its causes can be the relative weakness of the refractive apparatus of the eye, the short anteroposterior axis of the eye. The relatively high visual acuity of people with farsightedness is explained by the strain of accommodation of the eye. Due to such a constant voltage of accommodation, farsightedness does not appear in full (latent farsightedness). With age, due to the weakening of the accommodative ability of the eye, latent hyperopia becomes apparent. Since a constant tension of accommodation occurs during hyperopia, in the absence of correction of hyperopia, eye fatigue easily develops, manifested by headache, dull pains in the forehead and eyeballs.
The diagnosis can be made in the process of determining visual acuity in a study using special optical lenses. The degree of farsightedness is determined by the strongest of the collective lenses, which gives the best vision. This method is called subjective, since it is necessary to reckon with the assessments of the subject himself. An objective determination of the degree of farsightedness is carried out using refractometry. Farsightedness is corrected by convex glasses that enhance refraction.