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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…

Refractive defects

Among refractive errors of the eye are: Myopia (myopia) Farsightedness…

Refractive index

The index of refraction is a fundamental optical quantity characterizing any optical environment. For the material of contact lenses the figure of refractive index should be close to the value of…


It is a computerized device for measuring the refractive defect of the eye.


The retina is the third and inner coat of the eye which is a light-sensitive layer of tissue. The optics of the eye create an image of the visual world on the retina (through the cornea and lens)…

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