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Visual Impairments. KNR 270. Visual Impairments. What is visual acuity? Amount of detail that can be seen Clearness What is visual field? Entire area that can be seen at one time with fixed eyes 180 degrees. Visual Impairments. What do you think about when you hear that someone is blind?

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Visual impairments1
Visual Impairments

  • What is visual acuity?

    • Amount of detail that can be seen

    • Clearness

  • What is visual field?

    • Entire area that can be seen at one time with fixed eyes

    • 180 degrees


Visual impairments2
Visual Impairments

  • What do you think about when you hear that someone is blind?

    • What do you think they see?

    • What is your vision?


Visual impairments3
Visual Impairments

  • Legal blindness

    • 20/200 in best eye with correction

    • Or visual field of 20 degrees at the widest point

  • Can be legally blind and still have some useable or functional vision

    • Most have some functional vision

    • Only 5% are totally blind


At 20 feet, the person with 20/20 vision sees the stop sign clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


Visual impairment
Visual Impairment clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.

  • Congenital blindness

    • Birth – 5 years

    • No visual memory

  • After 5 years, there is visual memory that can help assist with learning


Visual impairments4
Visual Impairments clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.

  • Low vision

    • 20/70 – 20/200

    • 30 degrees

  • 72% of people with visual impairments are over 65 years

    • Diabetes

    • Cataracts

    • Glaucoma

  • Blindisms


Causes
Causes clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.

  • Congenital

  • Acquired (infection)

  • Accidents

  • Retinopathy of prematurity (ROP)

    • Premature infants, 100% oxygen

  • Detached retina

    • Retina detaches & rips from wall, creates blind spots

  • Diabetic retinopathy

  • Glaucoma

    • Increase pressure in eye, tunnel vision

  • Cataracts

    • Opacity of lens, infants & older people

  • Macular degeneration

    • Runs in families, problems with reading

  • Retinitis pigmentosa

    • Inherited


Mobility

Dog guide clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.

Only 5%

Mobility


Mobility1

White Cane clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.

Purpose

Identify

Probe

Protection

Mobility


Mobility2

Human (Sighted) Guide clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.

Mobility


Considerations accommodations
Considerations/Accommodations clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.

  • Ask how best help & about residual vision

  • Identify self / let know who is speaking

  • Speak directly to the person

  • Use normal voice volume

  • Introduce to group

  • Reduce loud or disturbing background noises


Considerations accommodations1
Considerations/Accommodations clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.

  • Never leave alone in space

    • Tell when leaving

    • Place near wall, table, chair

  • Orient to rooms / provide tours

    • Include restrooms, water fountains, emergency exits, main areas

    • Use clock or directions (N,S,W,E)

    • Landmarks

  • Reduce glare / good lighting


Considerations accommodations2
Considerations/Accommodations clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.

  • Use all senses in teaching

  • Be descriptive

  • Allow exploration/manipulation

  • Keep walkways clear of obstructions

  • Braille, larger text

    • Technology, Disability Concerns tour

  • Count out change

  • Adaptive equipment


Considerations accommodations3
Considerations/Accommodations clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.

  • Don’t touch guide dog

  • Use contrasting colors

    • Doors/walls

    • Step edges

  • Know human (sighted) guide

  • Places for dogs to potty

  • Others????


Sports goal ball
Sports: Goal Ball clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.

  • http://www.ncpad.org/competitive/fact_sheet.php?sheet=52&section=384


Sports beep baseball

http://www.nbba.org/rules/index.htm clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.

Sports: Beep Baseball


What s your bowling preference
What’s Your Bowling Preference? clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


Tandem bike riding
Tandem Bike Riding clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


Fore!!!! clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


Outdoor adventure
Outdoor Adventure clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


Around the campfire
Around the Campfire clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


Nature hike
Nature Hike clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


Sensory activities
Sensory Activities clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


Worn out in the wild west
Worn Out in the Wild West clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


Craft tactual bandanas
Craft: Tactual Bandanas clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


Hayride
Hayride clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


Games crafts
Games & Crafts clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


I ve never played bingo before
I’ve Never Played Bingo Before clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


Yum yum
Yum, Yum clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


My horse will be so cool
My Horse Will Be So Cool clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


Is this western or english
Is This Western Or English? clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


Costumes
Costumes clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


Saying goodbye
Saying Goodbye clearly. At 20 feet, the person with 20/40 vision sees the stop sign as if they were 40 feet away.


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