Astigmatism is a defect or imperfection in the eye curvature of the cornea or in the structure of the lens of the eye, characterized by a different eye refraction between two meridians, which prevents sharp focus objects. The cornea acts as a lens through which light passes that is focused on the retina. So that if the surface of the cornea is irregular in its curvature, astigmatism occurs because the light rays are not refracted properly. Low ( 0.25 diopters less than 1 ), medium (1 diopter less than 3 ) and high ( greater than or equal to 3 diopters ): According grades three types are classified.
Astigmatism
Astigmatism is a defect or imperfection in the eye curvature of the cornea or in the structure of the lens of the eye, characterized by a different eye refraction between two meridians, which prevents sharp focus objects. The cornea acts as a lens through which light passes that is focused on the retina. So that if the surface of the cornea is irregular in its curvature, astigmatism occurs because the light rays are not refracted properly. Low ( 0.25 diopters less than 1 ), medium (1 diopter less than 3 ) and high ( greater than or equal to 3 diopters ): According grades three types are classified.
Catarata y astigmatismo: pueden coexistir pero también solucionarse a la vez
By Dr. Salvador Nebro Cobos
2024-03-28
Más de un 25% de pacientes con cataratas también sufren astigmatismos superiores a 1,5 dioptrías. El Dr. Nebro, oftalmólogo, explica que, de la misma manera que coexisten, también pueden solucionarse a la vez, incluyendo una lente intraocular tórica. See more
Las enfermedades que puede provocar el astigmatismo
By Dr. Juan Sánchez Navés
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En este artículo, el Dr. Juan Sánchez Navés, especialista en Oftalmología, explica qué es el astigmatismo y qué enfermedades puede provocar este defecto anatómico del ojo. También explica cómo se puede corregir y qué pasa si no se trata adecuadamente. See more
Trifocals lenses to see well at all three distances
By Dr. Nicolás Toledano Fernández
2024-03-28
Unlike conventional multifocal lenses, or only allow focus from far and near, or focus far and intermediate vision, these trifocals allow good vision at all three distances. See more
¿Existen varios tipos de astigmatismo?
By Dr. Oscar Buchacra Castellano
2024-03-27
La probabilidad de desarrollar astigmatismo es hereditaria y suele estar presente desde el nacimiento, aunque normalmente es estable durante toda la vida. Puede asociarse a hipermetropía o miopía. See more
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