Disorders of the eye

Abnormalities in the eye, among others:

1. Astigmatism

Patients with astigmatism can not distinguish a straight line and a horizontal line at the same time, due to uneven curvature of the lens so that the rays that the eye can not be perfectly centered. Min eye defects can be remedied by using eye glass cylindrical lens.

2. myopia or nearsightedness

Patients myopia eye lens focal distance is too short that it can not clearly see objects that are far away. This eye defect can be remedied with a monocle concave or negative lens.

3. hipermetropi or farsightedness

Patients hipermetropi eye lens focal distance is too far away so it can not clearly see objects that are located close by. This eye defects can be helped with glasses or lenses convex positive lens.

4. presbiopi

Presbiopi sufferers can not see objects that are located near and far, because the accommodation power is weak. This eye defect can be remedied with a monocle double (convex lens and a concave lens).