REFRACTION

All the images of the world are formed on the screen of the eye, the retina. In order to appreciate what we see clearly, the light must focus exactly on the retina, neither before nor later.

The eyes that focus on the retina are called emmetrops. When this does not happen, the following refractive defects appear:

Hyperopia
Hyperopia
Myopia
Myopia
Astigmatism
Astigmatism
Presbyopia
Presbyopia
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