Taber’s Online
The latest edition of Taber’s Medical Dictionary Online provides more than 75,000 definitions, 33,700 audio pronunciations, 1,300 images, and 130 videos. Add mobile access to download Taber’s onto your smartphone and tablet.
Choose a plan to fit your needs
Whether you are a healthcare professional, educator, or student, Taber’s provides the most comprehensive medical definitions right when you need them.
...or explore the Taber’s App
(ă-stig′mă-tizm )
[ ¹an- + Gr. stigma, stem stigmat-, point + -ism ]
ABBR: As A form of ametropia in which the refraction of a ray of light is spread over a diffuse area rather than sharply focused on the retina. It is due to differences in the curvature in various meridians of the cornea and lens of the eye. The exact cause is unknown. Some types show a familial pattern.
astigmatic (as″tig-mat′ik ), adj.
SYN: SEE: astigmia
Astigmatism in which the eye has greater refractive power in the horizontal than in the vertical meridian.
Astigmatism in which both horizontal and vertical curvatures are involved.
Astigmatism resulting from inequalities in the refractive indices of different parts of the lens.
Astigmatism in which the curvature of the cornea is asymmetrical.
Astigmatism in which one meridian is myopic and the other hyperopic.
Astigmatism in which the abnormal curvature of the cornea is symmetrical with respect to an ocular axis.
Astigmatism along one meridian only.
Astigmatism in which the eye has more refractive power in the vertical meridian than in the horizontal meridian.
Free iOS and Android Preview
Download the new edition of Taber’s for a free preview. Scan the QR Code with the camera on your mobile device for access.
Stressed about NCLEX®?
The best NCLEX-prep on the market—12,500 questions, including brand-new clinical judgment questions!
Save 20% with REVIEW19