astigmatism definition

  • noun:
    • A visual defect when the unequal curvature of just one or more refractive areas for the eye, often the cornea, prevents light rays from concentrating plainly at one-point from the retina, resulting in blurred eyesight.
    • A defect of a lens in a way that light rays originating from a point try not to meet at a focal point so the image is blurred.
    • a problem regarding the eyesight, often because of a misshapen cornea, so that light will not concentrate correctly on the retina causing a blurred image.
    • A defect of the attention or of a lens, in result of that your rays based on one-point aren't delivered to a single center point, hence causing imperfect pictures or indistinctness of vision.
    • In ophthalmology, a defect in the refractive apparatus of this eye, the curvature of refracting surfaces being higher along particular meridians than along other people, so that rays of light continuing from an external point don't converge to a spot upon the retina, but to a line.
    • an equivalent problem in a lens.
    • (optics) defect in an optical system by which light rays from one point fail to converge in a single focal point
    • (ophthalmology) reduced vision resulting usually from irregular conformation of the cornea; typical in nearsighted men and women
    • A visual problem where unequal curvature of one or more refractive surfaces of attention, usually the cornea, prevents light rays from focusing obviously at one point from the retina, resulting in blurry sight.
    • A defect of a lens so that light rays via a spot try not to satisfy at a focal point so that the image is blurred.
    • a problem regarding the vision, generally because of a misshapen cornea, so that light doesn't concentrate properly regarding retina causing a blurred image.
    • A defect regarding the attention or of a lens, in consequence of which the rays produced by one point aren't brought to an individual focus, therefore causing imperfect pictures or indistinctness of sight.
    • In ophthalmology, a defect when you look at the refractive apparatus of eye, the curvature associated with the refracting areas becoming better along certain meridians than along other people, in order that rays of light continuing from an external point cannot converge to a point upon the retina, but to a line.
    • the same defect in a lens.
    • (optics) defect in an optical system by which light rays from an individual point neglect to converge in one center point
    • (ophthalmology) reduced vision resulting frequently from unusual conformation associated with cornea; typical in nearsighted individuals

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