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Human Vision

Human Vision. The Snellen Visual Acuity Chart. What is Meant by 20/20 vision?. At a distance of 20 feet, a normal eye can read the 20 foot line. 20/15 = person can see at 20 feet what a person with normal vision can see at 15 feet

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Human Vision

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  1. Human Vision

  2. The Snellen Visual Acuity Chart

  3. What is Meant by 20/20 vision? At a distance of 20 feet, a normal eye can read the 20 foot line. 20/15 = person can see at 20 feet what a person with normal vision can see at 15 feet 20/100 = person can see at 20 feet what a person with normal vision can see at 100 feet

  4. Ishihara tests for color deficiency • http://www.toledo-bend.com/colorblind/Ishihara.html

  5. Nearsightedness – “myopia” • Eyeball is abnormally long • Image focuses in front of retina • Can see well at short distances, can’t see far

  6. Farsightedness – “hyperopia” • Eyeball is abnormally short • Image focused behind retina • Unable to see close

  7. Astigmatism • Blurred or distorted images due to imperfections in the shape of the cornea or lens

  8. Cataract • Lens becomes opaque preventing light rays from reaching the retina

  9. Bleeding into the anterior chamber of the eye due to a direct blow May obscure all or part of the iris May impair vision Hyphema

  10. Conjuctivitis“Pink Eye” • Inflammation of the conjunctiva of the eye • Burning, itching, yellow discharge • Viral or bacterial

  11. Infection of the eyelid follicle Moist heat packs Do Not pop Sty

  12. Blowout Fracture: A fracture to the eye orbit, particularly its floor. The fracture may entrap some of the muscles that control eye movements Orbital Fractures

  13. Impaled Object in Eye

  14. Injuries to the Face and Spine

  15. Jaw Fractures

  16. LeFort Fractures

  17. Blowout Fracture: A fracture to the eye orbit, particularly its floor. The fracture may entrap some of the muscles that control eye movements Orbital Fractures

  18. Nasal Fractures

  19. Nosebleed Direct pressure – 15 min. DO NOT tilt head back Epistaxis

  20. Bleeding and fluid accumulation between cartilage and skin Excessive friction or trauma Ice, compression, drainage? Cauliflower Ear (Hematoma Auris)

  21. Infection of the ear canal due to moisture Drops before swimming (3% boric acid and alcohol) Swimmer’s Ear(Otitis Externa)

  22. Infection of the eyelid follicle Moist heat packs Do Not pop Sty

  23. Conjuctivitis“Pink Eye” • Inflammation of the conjunctiva of the eye • Burning, itching, yellow discharge • Viral or bacterial

  24. Bleeding into the anterior chamber of the eye due to a direct blow May obscure all or part of the iris May impair vision Hyphema

  25. Dental Injuries

  26. Impaled Object in Eye

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