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1、07 Nov. 2012,Vision-lab.ppt,1,Vision,Eye converts electromagnetic radiation (light) to action potentials Impulses carried over optic nerves & optic tracts to primary visual cortex,07 Nov. 2012,Vision-lab.ppt,2,Eye: Accessory structures,Eyebrow Eyelids Eyelashes,07 Nov. 2012,Vision-lab.ppt,3,Eye: Acc
2、essory structures,Orbicularis oculi muscle closes eye Conjunctiva Mucous membrane under lid and over surface of sclera,07 Nov. 2012,Vision-lab.ppt,4,Eye: Accessory structures,Lacrimal apparatus Lacrimal gland Excretory ducts Lacrimal punctum Lacrimal canal Nasolacrimal duct,07 Nov. 2012,Vision-lab.p
3、pt,5,Eye: Extrinsic Muscles,Six muscles aim each eye Superior rectus Inferior rectus Medial rectus,Lateral rectus (abducens) Superior oblique (trochlear) Inferior oblique,07 Nov. 2012,Vision-lab.ppt,6,Eye,Three layers (tunics) Fibrous tunic Sclera Cornea Vascular tunic Choroid Ciliary body Iris Sens
4、ory tunic = Retina,07 Nov. 2012,Vision-lab.ppt,7,Eye,Anterior segment Aqueous humor secreted by ciliary body Drained through scleral venous sinus (Canal of Schlemm) Posterior segment Vitreous humor,07 Nov. 2012,Vision-lab.ppt,8,Eye: Refraction,Cornea More refraction Fixed (not focusable) Lens Connec
5、ted to ciliary body by suspensory ligaments Changes shape to focus Flatten for distance Thicken for near vision,07 Nov. 2012,Vision-lab.ppt,9,Focusing, Accomodation,Lens changes shape to focus Flatten for distance Thicken for near vision,07 Nov. 2012,Vision-lab.ppt,10,Regulating Light Intensity,Brig
6、ht light stimulates parasympathetic reflex to constrict pupils Dim light stimulates sympathetic reflex to dilate pupils Atropine (Norepinephrine mimic) used to dilate pupils,07 Nov. 2012,Vision-lab.ppt,11,Eye,Sensory tunic = Retina Extension of brain Optic disc Attachment, origin of optic nerve Cent
7、ral artery & vein Macula lutea & fovea centralis,07 Nov. 2012,Vision-lab.ppt,12,Eye: Retina,Retina built “backwards” Light passes through 3-4 layers of cells before reaching photoreceptors Retinal cells Ganglion cells Cell bodies of optic nerve fibers Bipolar cells Rods Cones,07 Nov. 2012,Vision-lab.ppt,13,Eye: Retina,Rods Retinal + opsin rhodopsin Absorbs light across whole visual spectrum Cant distinguish color Sensitive to dim light Few rods in macula lutea More concentrated in peripheral parts of retina,
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