Like progressive glasses, multifocal and bifocal contact lenses also allow the correction of both ametropia (myopia, hyperopia and astigmatism) and presbyopia at the same time.
Presbyopia is the visual anomaly that occurs in adulthood between the ages of 40 and 50, due to a reduction in the eye's accommodating power. This is a physiological phenomenon traditionally attributed to a reduction in plasticity of the crystalline lens.
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