Farsightedness

Farsightedness (hypermetropia). The far point is at a finite distance behind the eye. Parallel rays entering the eye are refracted to the focus, which is behind the eyeball (pic.).okem. This is because:
 * the eyeball is too short (a more common defect, created during embryonic development);
 * the eye has less refraction of the optical system than a healthy eye. optického systému

In farsightedness, presbyopia manifests itself much earlier. With decreasing accodommodative ability, hypermetropia eventually needs distance glasses. A special case of hypermetropia is aphakia, which is a defect caused by removing the lens, for example for a cloudiness. presbyopie afakie zákal.

The defect is corrected with a coupling lens. spojkou.

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