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geometrical optics oblige muscles recti muscles visual fields extra ocular muscles contrast sensitivity levator palpebrae superioris superior rectus infe optical center optical interface paraxial rays visual function effect of age on cornea lens retina age related ocular diseases low vision colour vision occupational optomery occupational eye disorders occupational health occupational diseases occupational eye exam occupational hazards occupational eye illness laser eye damage radiations primary eye care eye protection protective eye wears eye protection at home where eye protection is needed eye protection at work eye protection in sports optometry optics rays optics refraction reflection pin hole plane surfaces curved surfaces laws of reflection laws of refraction light cardinal points nodal points focal points focal planes principal points principal planes optical axis ocular movements extra ocular muscles actions monocular eye movements (ductions & torsions) sherrington鈥檚 law of reciprocal innervation hering鈥檚 law of equal innervation vergences(disjunctive eye movements grades of binocular single vision binocular single vision tests binocular single vision retinal correspondence diplopia and confusion suppression bagolini's striated glasses test worth's 4 dot tes test for retinal correspondence test for suppression tests for fusion: tests for stereopsis development of eye and vision at different ages vision color sensitivity visual tracking refractive error binocular vision steriopsis alkali burns blunt injuries chemical burns electrical hazards household hazards mechanical hazards ocular hazards penetrating injuries sports hazards thermal hazards driving and vision extra ocular muscles anatomy extra ocular muscles origin extra ocular muscles insertion annulus of zinn spiral of tillaux extraocular muscles motor units nerve supply of extra ocular muscles blood supply of extra ocular muscles extra ocular muscles physiology fick鈥檚 axes listing鈥檚 law cardinal positions of gaze diagnostic positions of gazes