VisionThe common activities of eye, optic nerve and optic cortexformedvisionWavelengths400-700nmconstitutevisiblelightforhumansAOpticnerveACiliary ganglionPreganglionicparasympatheticfiber in cranialnerve IllAEdinger-术WestphalnucleusPretectumSuperiorcolliculusC200lSitoP.Associotes,lnc
Vision • The common activities of eye, optic nerve and optic cortex formed vision Wavelengths 400-700nm constitute visible light for humans
VisionEye-theaffiliatedorganofvisualsystem,includingdioptricsystem(cornea,aqueoushumor,lensand vitreoushumor)andphotographicsystem(retina and opticnervefiber)Photoreceptor(b)CiliarymuscleLensScleraCorneaPupilIrisAqueous humorZonularfibers
Vision • Eye - the affiliated organ of visual system, including dioptric system (cornea, aqueous humor, lens and vitreous humor) and photographic system (retina and optic nerve fiber) Photoreceptor
VisionCopyrightTheMcGraw-Hil Companies,Inc.Permissionrequiredforreproductionordisplay(a)MuscleCiliarymuscleVitreous humorLensScleraRetinaCorneaBloodvesselsPupilFoveacentralisIrisOpticnerveAqueoushumorChoroidZonularfibersSclera:white,connectivetissueCornea:transparent, good at self-repairPupil:central openingIris:coloredmuscleAqueousandvitreoushumorRetina
Vision Sclera: white, connective tissue Cornea: transparent, good at self-repair Pupil: central opening Iris: colored muscle Aqueous and vitreous humor Retina
VisionIris-Brightlight:PSNS,circularlyarranged smoothmusclecontractsmallerpupil-Dim light:SNS,radiallyarranged smooth musclecontractlargerpupilPostganglionicsympatheticaxonINDIM-FromsuperiorLIGHTcervicalganglionRadiallyarrangedsmoothmusclefibers of the irisCircularly arrangedINNORMALsmoothmuscleLIGHTfibersoftheirisPupilemWwww.oCiliaryFromganglionoculomotorINBRIGHT-nerveLIGHTPostganglionicparasympatheticaxon
Vision • Iris - Bright light: PSNS, circularly arranged smooth muscle contract → smaller pupil - Dim light: SNS, radially arranged smooth muscle contract → larger pupil
VisionRefractiveSystemoftheEyeCornea: Primary refraction of imageLens: Accommodation of image under neural controlPupCormeIrZonuleinanteriochannbetfibersRefractionPooteriorchambesCLeriBendingof lightwhenitpassesfromaChoroidmedium of one density into a mediumof another densitySeherVitreshuminAs a result,imageis inverted on retinaReeinuFoveOpticdisdnndmtinalvrsse
Vision • Refractive System of the Eye Cornea: Primary refraction of image Lens: Accommodation of image under neural control • Refraction Bending of light when it passes from a medium of one density into a medium of another density As a result, image is inverted on retina