Orthophoria

That condition in which the eyes, or better, the visual axes, are parallel when the extrinsic muscles are in a state of rest. Perfect muscular balance.

Source: Ophthalmic Dictionary including pronunciation, derivation and definition of the words used in Optometry and Ophthalmology by James J. Lewis, Oph. D. Professor of Optometry in the Northern Illinois College of Ophthalmology and Otology, Chicago.