orthophoria

Absence of heterophoria; the condition of binocular fixation in which the lines of sight meet at a distant or near point of reference in the absence of a fusion stimulus. [ortho- + G. phora, motion]

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or·tho·pho·ria .ȯr-thə-'fōr-ē-ə n a normal condition of balance of the ocular muscles of the two eyes in which their lines of vision meet at the object toward which they are directed

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n.

the condition of complete balance between the alignment of the two eyes, such that perfect alignment is maintained even when one eye is covered. This theoretically normal state is in fact rarely seen, since in most people there is a minimal tendency for the eyes to deviate (see heterophoria).

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or·tho·pho·ria (or″tho-foґre-ə) [ortho- + phoria] the absence of heterophoria; the normal condition in which the visual axes remain parallel after the visual fusional stimuli have been partially or entirely eliminated. orthophoric adj