[The ametropías: updated review for non-ophthalmologists physicians]

Refractive errors are caused by a decoupling of the power of convergence of the eye lens, the cornea and lens, which make the rays reaching the eye to focus and generate an image, and the retina, which is the biological photosensitive screen where the image will be transformed into a nerve impulse. These defects include myopia, hyperopia and astigmatism. Presbyopia can also be considered a refractive defect, but of special features, since only affects near vision in patients older than 40 years. By altering the quality of the focused image on the most sensitive area of the retina (the macula), they decrease visual acuity. For their management several options exist, from the use of glasses and contact lenses to surgical correction (refractive surgery). The incidence of certain refractive errors (myopia specifically) has increased in recent decades, some environmental factors related to it have been identified. Some medical management measures have shown a positive effect in controlling its onset and progression.