astigmia

Definitions of astigmia

1. noun

   (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
   synonyms: astigmatism

   types:

   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

   type of:

   ametropia

   (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia
2. noun

   (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
   synonyms: astigmatism

   type of:

   condition, status

   a state at a particular time