Before revision: Orthophoria is a condition of binocular fixation in which the lines of vision meet at the object toward which they are directed, and considered as a normal condition of balance of the ocular muscles of the two eyes.
After revision: isOrthophoria is a condition of binocular fixation in which the lines of vision meet at the object toward which they are directed, and considered as a normal condition of balance of the ocular muscles of the two eyes.