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Online test for myopia, hyperopia, emmetropia. Ametropia occurs when the length of the eye and its refractive power do not match. In this case, the image does not fall exactly on the retina, but is formed in front of it or behind it, which causes a loss of clarity of vision. How to determine whether the cause is myopia or hyperopia? For this, a duochrome test is used, which helps to distinguish the main types of ametropia.

Opacification of the lens is not always associated with the influence of external negative factors –...