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EYE ANATOMY EYE ANATOMY http://everlastingelephants.blogspot.com/2009/08/what-is-eye-cataract.html EYE ANATOMY The orbital bone The eye socket Eye is cushioned within orbit by pads of fat Lacrimal gland http://commons.wikimedia.org/wiki/File:Eye_orbit_anatomy_anterior2.jpg Produces tears http://mwsu-bio101.ning.com/forum/topics/distinct-human-celltypes-1?commentId=2263214%3AComment%3A10331 EYE ANATOMY Eyelids (L): Protection against particles and light Help spread tears over surface of eye- moist & comfort Eyelashes (L): Filter out foreign matter http://www.medical-look.com/human_anatomy/organs/Eyelids_and_eyelashes.html EYE ANATOMY Sclera (S): “White of the eye” Tough, opaque tissue that extends around the eye Attached to the extraocular muscles http://www.thirdeyehealth.com/sclera.html EYE ANATOMY Extraocular Muscles Help move the eye left, right, up, down and diagonally These 6 muscles are: Superior rectus Inferior rectus Medial rectus Lateral rectus Inferior oblique Superior oblique http://media.photobucket.com/image/introduction%20to%20eye%20anatomy/trimurtulu/Eye.jpg EYE ANATOMY Cornea (K): Clear tissue infront of the Irisi Function: Focus light as it enters eye Avascular Only organ that has no blood vessels http://commons.wikimedia.org/wiki/File:Cornea.jpg EYE ANATOMY Pupil (P): Central opening of iris Iris (I): Ring shaped tissue Colored part of eye Controls the amount of light that enters the eye Two muscle fibers: Contraction http://www.bioconsulting.com/Bio_Tech_Assessment.html Constricts pupil in bright light Dilation Dilates pupil in dark http://www.goodhope.org.uk/departments/eyedept/angleclosureetc.htm EYE ANATOMY Crystalline Lens: Clear, flexible structure Behind the iris & pupil The lens & ciliary body help control fine focusing of light as it passes through the eye http://www.smartplanet.com/business/blog/smart-takes/artificial-lens-implant-to-givepatients-high-definition-vision-better-than-2020/2558/ EYE ANATOMY Vitreous Chamber: Located behind the lens & in front of the retina Filled with a gel-like fluid called the vitreous humor The vitreous help maintain the shape of the eye http://www.ophthobook.com/questions/question-how-many-chambers-are-there-in-the-eye EYE ANATOMY Retina: Acts like the film in a camera to create an image hhttp://www1.appstate.edu/~kms/classes/psy3203/EyePhysio/human_retina.htm http://www.answersingenesis.org/tj/v13/i1/retina.asp EYE ANATOMY Retina: Acts like the film in a camera to create an image Converts light signals into nerve signal then send these signals to the optic nerve Optic nerve carries the signals to the brain hhttp://www1.appstate.edu/~kms/classes/psy3203/EyePhysio/human_retina.htm http://www.answersingenesis.org/tj/v13/i1/retina.asp EYE ANATOMY Retina: Acts like the film in a camera to create an image Converts light signals into nerve signal then send these signals to the optic nerve Optic nerve carries the signals to the brain hhttp://www1.appstate.edu/~kms/classes/psy3203/EyePhysio/human_retina.htm Rods- low light situations Cones- allows you to see color http://www.answersingenesis.org/tj/v13/i1/retina.asp EYE ANATOMY Optic Nerve A bundle of 1 million nerve fibers Responsible for transmitting nerve signals from the eye to the brain The optic disc is the front surface of the optic nerve http://cssd.us/body.cfm?id=802 The optic disc is visible on the retina http://www.wollongong.youronlinecommunity.com.au/wollongong-online/2008/50/walkthrulife/eyehealth.html EYE ANATOMY Macula Located in the central part of the retina Responsible for giving sharp central vision Used for reading, recognizing faces, and watching TV http://www.dukehealth.org/eye_center/specialties/macular_degeneration/care_guides/macular_dege neration_frequently_asked_questions OPTIC CHIASM The X-Shaped space infront of the pituitary gland where the optic nerves cross the brain