Chapter 14- Introduction to low vision Part 2 Flashcards
What is a non-optical low vision aid?
This is a device which doesn’t use any optical lenses, but that helps people with low vision to function more effectively and comfortably during visual tasks.
What are some examples of non optical devices?
1- Electronic devices,
2- Large print books,
3- Speech synthesisers
What is probably the most important optical aid?
Lighting
Performance increases with improvements in what for older people and visually impaired subjects?
Task illuminance
How much light does a 60 year old receive in relation to a 20 year old?
A 60 year old retina receives one third of the amount of light that reaches the 20 year old retina.
In order to optimise the lighting for visually impaired patients, you would…
Increase the general ambient level of illuminance
What are some examples of increasing the general ambient level of illuminance?
1- Paint house walls with light colours
2- Carry torch when ambient lighting is poor.
Visually impaired people that suffer from a glare can cause a reduction in what?
Visual acuity
How would you reduce the affects of a glare?
By wearing sunglasses or visors.
These are low vision non optical devices
In order to make reading/writing easier for elderly patients, what would you recommend?
1- Reading stands
2- Writing guide
3- Signature guide
Name some large print items
1- Large print books
2- Large print newspapers
3- Large print watches
Name some talking devices
1- Talking watches
2- Talking newspapers
3- Talking blood glucose meter- people with diabetes can get diabetic retinopathy so this is important
For people with low vision, what can they use to manage money?
1- Note detector
2- Coin holder
What are the advantages of an electronic visual enhancement system (CCTV)?
1- Larger range of magnification
2- Variable magnification- can tailor it to your vision
3- Good field of view
4- Can use both eyes
What are disadvantages of an electronic visual enhancement system (CCTV)?
1- Can be quite bulky- won’t be able to carry it easily
2- Expensive
What are some examples of electronic visual enhancement systems?
1- Mouse style devices- need an ordinary TV or computer and is the cheapest option
2- Portable devices- also cheap
3- Desktop varieties- Expensive
What are head mounted devices?
These are glasses that make use of cameras and project an image that you are looking at
What are some examples of head mounted devices?
1- Give Vision glasses
2- Esight glasses
What is the disadvantage of head mounted devices?
The disadvantage is that they are very expensive.
What options on your phone and computer allow patients with visual impairment to use it with ease?
Accessibility options
What is braille?
Braille is a tactile reading code that enables people to access information by touch.
What are some braille gadgets?
1- Braille note
2- Braille displays
What are some charities that help the visually impaired?
1- RNIB- Royal national institution for blind people
2- Guide dogs for the blind
3- Macular society
Who are some of the personnel that are involved in low vision services?
1- Optometrists
2- Carers, family members, etc
3- General practitioners
4- Orthoptists
