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Low Vision Rehabilitation

Low Vision Rehabilitation. Lions Clubs International IAG Mission Myanmar, 2013. Suleiman Alibhai, O.D. Doctor of Optometry. 1. Prevalence of Blindness and Low Vision in US Population over age 40. Glossary of Terms. Vision Rehabilitation Low Vision Legal Blindness Visual Disorder

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Low Vision Rehabilitation

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  1. Low Vision Rehabilitation Lions Clubs International IAG Mission Myanmar, 2013 • Suleiman Alibhai, O.D. • Doctor of Optometry 1

  2. Prevalence of Blindness and Low Vision in US Population over age 40

  3. Glossary of Terms • Vision Rehabilitation • Low Vision • Legal Blindness • Visual Disorder • Visual Impairment • Visual Disability • Visual Handicap 5

  4. Anatomy of the Eye 6

  5. Vision Rehabilitation • Services provided to a visually impaired individual to improve their safety, independence, ability to become educated or employed and quality of life. 7

  6. Looking Inside the Eye 8

  7. Low Vision • Any level of vision that interferes with the individual’s ability to perform normal daily living activities such as reading, writing, driving, grooming, walking etc. 9

  8. Legal Blindness • Vision that cannot be improved beyond 20/200 in the better seeing eye using conventional lenses or a visual field that extends to 20 degrees or less in diameter in the better seeing eye. 10

  9. Visual Disorder • The anatomical or pathological condition affecting the eye: • Corneal astigmatism from keratoconus • Nuclear sclerosis form a cataract • Retinal detachment from diabetic retinopathy • Disciform scar from macular degeneration 11

  10. Cataract 12

  11. Visual Impairment • The measurable impact of the visual disorder on the eye: • Diminished visual acuity • Reduced contrast sensitivity • Loss of peripheral visual field • Slower reading speed 13

  12. Cataract Diagram 14

  13. Visual Disability • The impact of the visual impairment on performing normal daily activities: • Inability to read the mail, prices, recipes etc. • Compromised communication from an inability to recognize faces. • Inability to get around safely and independently. 15

  14. Cataract Vision 16

  15. Visual Handicap • The impact of the disability on the individual’s ability to function in society: • Need for large print software in order to use a computer. • Implementation of a talking sign to identify a bus. • Help from a sighted assistant to negotiate a grocery store. 17

  16. Impact of Being Visually Impaired • Loss of independence and increased dependence on children, spouse or others • Secondary health issues due to depression, anxiety, falls and other injuries • Diminished self esteem and feelings of being a “burden” on family and society 18

  17. Leading Causes of Vision Impairment: • Diabetic Retinopathy – affects 5.3 million Americans over the age of 18. • Age Related Macular Degeneration – leading cause of legal blindness for people over the age of 60, it affects more than 1.6 million Americans. • Glaucoma – at least 2.2 million Americans are afflicted. 19

  18. Diabetic Retinopathy 20

  19. Looking Inside the Eye 21

  20. Diabetic Retinopathy 22

  21. Diabetic Retinopathy Vision 23

  22. Glaucoma 24

  23. Glaucoma Vision 25

  24. Looking Inside the Eye 26

  25. Macular Degeneration Dry 27

  26. Macular Degeneration - Wet 28

  27. Macular Degeneration Vision 29

  28. Categories of Visual Aids • Enhance distance vision • Telescopes • Video magnifiers • Enhance near vision • Glasses: • - Bifocals • - Prism glasses • -Microscopes • Near telescopes • Magnifiers • Video magnifiers 30

  29. Bifocals 31

  30. Microscopes 32

  31. Modifying Size: Near Telescopes

  32. Pelli Robson Contrast Sensitivity Chart

  33. Modifying Glare and Enhancing Contrast

  34. Magnifiers 36

  35. Video Magnifiers 37

  36. Portable Video Magnifiers 38

  37. Portable with Variable Magnification • Amigo • Optelec Traveler 39

  38. Portable Video Magnifiers combined with laptop computers

  39. Video Magnifier and OCR combined

  40. Telescopes 42

  41. Modifying Size: Bioptics

  42. Head Mounted Electronic Aid 44

  43. Implantable Miniature Telescope IMT by Dr. Isaac Lipshitz • Visual prosthetic device • Designed toimprovevision byrenderingcentral visual field over central and peripheral retina • Reduces effective size of scotoma (blind spot) 45

  44. 52 - 60° Retinal Image Wide Angle Implant Central Visual Field Projection 46

  45. Low Vision Technology of Future • Measure and map extent of visual loss • Write software algorithm to compensate for • Resolution and visual field loss • Glare and contrast • PRL and scotoma • Head mounted system with eye tracker and mini computer worn by patient • Software modified as vision changes • Alternatively a digital prosthetic implant 47

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