[ ôr′thə-fôr′ē-ə ]
The normal condition of balance between the muscles of the eyes that permits the lines of sight to meet at an object being looked at.
Related formsor′tho•phor′ic (-fôr′ĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.