Hyperopia is a disturbance of vision at which person sees well remote subjects, and closely located- poorly. In the 15th century when book printing appeared, this visual impairment became the reason of glasses invention. Concave lenses for the mope-eyed were invented a century later.
Little children and aged people beyond 40 may be far-sighted. Because of age weakening of lens ability to change the form presbyopia comes. For normal vision the subject image should be focused on retina. The point of the ideal image at a hyperopia is moved further and is behind a retina. As a result, the person sees a vague image.
The shorting of eyeball or bad refractivity of optical system is the cause of the wrong focusing.
The main implications of hyperopia: increased fatigue of eyes when examining close subjects, poor eyesight nearby, burning sensation in eyes, headaches. If to ignore hyperopia, complications: strabismus, conjunctivitis, amblyopia or lazy eye is possible (eye seems healthy, but poorly sees, it is impossible to correct problem with glasses or lenses). At advance of hyperopia the outflow of intraocular liquid is broken and glaucoma develops.
There are three main methods of hyperopia correcting – glasses wearing, contact lenses, surgical correction. Children with hyperopia should start use lenses or glasses as soon as possible, to wear them permanently. The elder child becomes the more extended is eyeball and vision is normalizes.
Glasses or lens are required for adults for reading and fine work. At strong degree of hyperopia glasses for near and far vision are separately prescribed.