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astigmia

DEFINITIONS OF: astigmia

1

n (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

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

Synonyms:
astigmatism
Antonyms:
stigmatism
(optics) condition of an optical system (as a lens) in which light rays from a single point converge in a single focal point
Type of:
condition, status
a state at a particular time
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