medical , illustrative set eye diseases and strabismus

art binocular clip convergent crossed depth developing deviation diagram direction disease diseases disorders downward esotropia exotropia explanation eye eyeball eyes eyesight health healthy hypertropia hyportropia hypotropia illustrative impairment isolated lateral man medial medical monocular movements muscles normal normality ophthalmic ophthalmology perception position pseudo pseudosquint pseudostrabismus pupilunder set squint stereopsis strabismus surgery symptoms tilt translation upward vector vision visual