| Learning / English Dictionary |
ASTIGMIA
| Pronunciation (US): |  | (GB): | |
I. (noun)
Sense 1
Meaning:
(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
Synonyms:
astigmatism; astigmia
Classified under:
Nouns denoting stable states of affairs
Hypernyms ("astigmia" is a kind of...):
condition; status (a state at a particular time)
Domain category:
optics (the branch of physics that studies the physical properties of light)
Derivation:
astigmatic (of or relating to a defect in the eye or in a lens caused by a deviation from spherical curvature which prevents light rays from meeting at a common focus and so results in distorted images)
Sense 2
Meaning:
(ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
Synonyms:
astigmatism; astigmia
Classified under:
Nouns denoting stable states of affairs
Hypernyms ("astigmia" is a kind of...):
ametropia ((ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia)
Domain category:
ophthalmology (the branch of medicine concerned with the eye and its diseases)
Hyponyms (each of the following is a kind of "astigmia"):
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)
Derivation:
astigmatic (of or relating to a defect in the eye or in a lens caused by a deviation from spherical curvature which prevents light rays from meeting at a common focus and so results in distorted images)
