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It is the ratio of total fragility of the fracture environment eye to the length of the eyeball.

In a healthy eye refraction is ideal, so that the retina is located at the focal point of the optical system and the image is displayed directly on the retina. Investigations by the device, called an Autorefractor, which sets the diopter values eye is only auxiliary examination to determine the refraction (diopter of spectacles).

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