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abnormal retinal correspondence accommodation ADduction amblyopia amount angle kappa annulus of Zinn antagonist appear asthenopia astigmatism axes binocular single vision cardinal directions center of rotation Chapter Chavasse check ligaments corneal correction cyclophoria degrees deviating eye dextroversion diplopia diplopia fields directions of gaze divergence ductions effect esophoria esotropia fibers fixation object fixing eye fovea globe heterophoria heterotropia horizontal hypermetropia hyperphoria images inferior oblique insertion left eye fixing lesion macula Maddox rod measurement meridian monocular move movement nerve nonfixing eye normal occluded ocular oculorotary muscles operation Ophth ophthalmologist orbital orthophoria orthoptic paralysis paresis paretic muscle perimeter phoria plane primary position prism diopters reading distance recession reflex refraction result retinal correspondence right eye fixing Scobee secondary actions secondary deviation seen six cardinal directions stimulation superior oblique superior rectus surgery surgical symptoms tilt torsion usually vergence vertical recti visual acuity visual axis visual line yoke muscle