astigmatism

Noun
  1. (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea;
    Common in nearsighted people (synset 114577182)
    referred to in: ophthalmology - the branch of medicine concerned with the eye and its diseases
    is a type of: ametropia - (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia
    subtypes:
    • keratectasia - abnormal bulging of the cornea of the eye
    • keratoconus - abnormal cone-shaped protrusion of the cornea of the eye; can be treated by epikeratophakia
    same as: astigmia
  2. (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point (synset 113961932)
    referred to in: optics - the branch of physics that studies the physical properties of light
    is a type of: condition, status - a state at a particular time
    same as: astigmia

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