Definitions And Categories Flashcards
What is functional Blindness
The absence of form vision. Px can’t read or write visually, or orientate visually
What VA do px in category 1 (mild)
- worse than 6/12
- better/equal 6/18
VA in category 2
- maximum VA 6/60
- minimum VA 3/60
VA in category 3
Blind
- maximum less than 3/60
- minimum 1/60
VA in category 4
Blind
- less than 1/60
- light perception
VA in category 5
Blind
- no light perception
Definition of functionally sighted
Visually impaired but can read with LVA, or roughly identify objects and can move around in unfamiliar environments
4 factors affecting quality of vision
- contrast sensitivity
- glare
- occulomotor control
- visual processsing and perceptual difficulties
What can be done to try and improve visual outcomes
- vision enhancement
- LVA
- sensory substitution
Why register as visually impaired
- welfare benefits
- health and social services
- epidemiological services
Classification of visual impairment
- Impairment
- disability
- handicap
Types of LVA
Optical
- magnifiers
- telescopes
Non optical
- electronic aids
- lighting
- tints
- large print
- talking books
- environmental design features
- braille
- canes
- digs
What is functional blindness
- no form vision
- can’t read or write with LVAs
- can’t identify objects
- can’t move in unfamiliar surroundings
What is functionally sighted
- visually impaired but can read with LVAs
- can identify objects
- can move in unfamiliar surroundings
