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Từ điển Oxford Learners Wordfinder Dictionary
astigmatism


noun
1. (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea;
common in nearsighted people
Syn:
astigmia
Derivationally related forms:
astigmatic (for: astigmia), astigmatic
Topics:
ophthalmology
Hypernyms:
ametropia
Hyponyms:
keratectasia, keratoconus
2. (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
Syn:
astigmia
Ant:
stigmatism
Derivationally related forms:
astigmatic (for: astigmia), astigmatic
Topics:
optics
Hypernyms:
condition, status


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