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My Own Deck > Visual Impairment 5- Non Optical Aids > Flashcards

Visual Impairment 5- Non Optical Aids Flashcards

1
Q

Whats classified as a non optical aid?

A 
EVES
TV/Computes/IPads
Lighting 
Contra/colour
Tints and glare 
Everyday living
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2
Q

What is the real image magnification?

A

Linear size if screen/linear size original objects

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3
Q

What are the advantages of EVES?

A 
Rapid mag change
Less tiring- binocular
Flexible use psychologically accepted 
Enhanced contrast available 
Physical infirmity 
Reduced aberrations from high powered lens
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4
Q

What are the disadvantages of EVES?

A 
Require practice 
Bulky
Expensive 
Limited depth of focus 
Blur sensation of blur when text moves
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5
Q

In CCTV what helps reduce glare and flicker?

A

Reverse contrast

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6
Q

What are the advantages of P-EVES?

A 
HAND HELD!!
Psychologically accepted 
Rapid mag change 
Flexible use 
Less tiring 
Contrast reversal
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7
Q

What are the disadvantages of P-EVES?

A

MANNUAL DEXTERITY
LIMITED FOV- small screen
Requires flat surface

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8
Q

What is the best and preferred use if P-EVES?

A

Leisure reading increased length of time

Aid visual tasks

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9
Q

When can head mounted EVES be used?

A

Better for young patients and for better levels of acuity

…. although not widely used!

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10
Q

What would enhance reading speed?

A 
Drifting text (PREFERRED)
Rapid Serial Visual Presentations  (RSVP)
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11
Q

What non optical aids can be used for reading?

A

Kindle
I pad
Monomouse

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12
Q

What adjustments were found to be made to computers to ease use?

A

Larger screens
Shorter viewing distance
Greater angular sizes
Assisstive technology

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13
Q

What were the benefits of using kindle?

A 
Light weight
Easy to handle 
No probs with stand mag
5x mag available 
Better congrats c LED screen
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14
Q

What is the contrast formula used?

A

Lmax-Lmin/Lmax+Lmin

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15
Q

What spectrum is most effected in VI pxs?

A

Red and blue spectrum

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16
Q

What areas in everyday living would need to have appropriate contrast and colour?

A

Stair/landing
Dangerous liquids
Electric sockets
Coloured plates

17
Q

What 7 characteristics would improve good lighting?

A
  1. Appropriate for individual
  2. Tasks, orientation, movement
  3. Evenly spread c minim glare
  4. Adjustable
  5. Energy efficient
  6. Simple to install
  7. Adaptable for future
18
Q

What are fall deaths contributed to?

A

Poor lightning and hip fractures (90,000 falls)

19
Q

What is considered to be a better predictor of benefits of illumination?

A

Integrated contrast sensitivity

20
Q

What should the patient be advised of in relation lighting?

A

Encourage for even illumination c supplemented task lighting

21
Q

Why is luminance difference tiring?

A

If px has prolonged photostress recovery

22
Q

What is the inverse square law?

A

Halfing the distance from light source will increase available illumination by 4x

23
Q

What is the cosine law?

A

Increasing angle between object and light source will decrease available illumination

24
Q

When should a tint be used?

A

If a condition is giving rise to VI

25
Q

What colour tints would be useful for discomfort glare?

A

Grey
Brown
ND filter
Photochromic

26
Q

What causes discomfort glare?

A

Opacities, achromatopsia, albinism

27
Q

What colour tints would be useful for disabling glare?

A

Polaroid
UV
Blue absorbing

28
Q

Whats another way to increase contrast aside from filters?

A

Typoscopes

29
Q

If a px were to present with AMD or cone dystrophy, what filter would be useful?

A

Dark orange/red filter (enables Rod functio)

30
Q

What gadgets in everyday living made available for VI pxs?

A 
Coin holders
Note identifiers 
Phones 
Liquid level indicators
Talking tins
Penfriend labeller 
Eye dropper tool
English voice announcer

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