astigmia - Hutchinson encyclopedia article about astigmia Printer Friendly
Dictionary, Encyclopedia and Thesaurus - The Free Dictionary
1,884,419,169 visitors served.
forum mailing list For webmasters
?
New: Language forums
Dictionary/
thesaurus
Medical
dictionary
Legal
dictionary
Financial
dictionary
Acronyms
 
Idioms
Encyclopedia
Wikipedia
encyclopedia
?

astigmatism
(redirected from astigmia)

    Also found in: Dictionary/thesaurus, Medical, Encyclopedia, Wikipedia 0.06 sec.

astigmatism

Aberration occurring in the lens of the eye. It results when the curvature of the lens differs in two perpendicular planes, so that rays in one plane may be in focus while rays in the other are not. With astigmatic eyesight, the vertical and horizontal cannot be in focus at the same time; correction is by the use of a lens that reduces the overall focal length of one plane so that both planes are seen in sharp focus.



How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content.
?Page tools
Printer friendly
Cite / link
 Email
Feedback
?Sign in SSL protected
Email:
Password:
Register

? Mentioned in ? References in periodicals archive
 
Again, there is a limit as to how long a person with moderate to large amounts of astigmia can concentrate on a detailed task without some avoidance and/or fatigue that can lead to an eye-tension-related headache.
Answering your questions by Baer, Daniel M. / Medical Laboratory Observer
More results
 
Hutchinson browser? ? Full browser
 
 
Hutchinson Encyclopedia
?

Disclaimer | Privacy policy | Feedback | Copyright © 2010 Farlex, Inc.
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. Terms of Use.