Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: A-2 + Greek stigma 'mark, point'; because there is no point at which light focuses

astigmatism

 noun
     
Related topics: Illness and Disability
as‧tig‧ma‧tis‧m [uncountable]
MI difficulty in seeing clearly that is caused by a change in the inner shape of the eye
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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