Biological Influences on Visual Perception Flashcards
1
Q
what are the three main biological influences on visual perception
A
- Physiological make-up
- Ageing
- Genetics
2
Q
what is phycological makeup and how does it effect visual perception?
A
- born without optic nerve or vitreous humour did not self regulate their physiological make-up would be effected
- cones cells - cannot see colour
3
Q
what is ageing and how does it effect visual perception?
A
- loss of ability to see visual stimuli
- beyond the age of 50 driving, reading more difficult
Examples:
- presbyopia
- Floaters
- Cataracts
- Age-related Macular
- Degeneration (AMD)
- Glaucoma
4
Q
what is Presbyopia?
A
- eyes lens starts to loose flexibility and begins to speech over time. the lens then fails to bend light
5
Q
what are floaters?
A
- gel like vitreous humour clumps together and deteriorates to form little crystals which float in our eyes
- particular noticeable when we look at bright light
6
Q
what are cataracts?
A
- eyes lens become cloudy due to the breakdown of proteins
- stops light from passing through lens or cornea resulting in blurred vision and a difficulty seeing at night or in bright light
- associated with lifestyle factors
- cloudy and scatters light causing an image thats out of focus and hazy
7
Q
what is degeneration (AMD)
A
- disease caused by build-up of grainy deposits in the macula
- inflammation and degeneration of macular photoreceptor cells
- blurry spot, inability to see
8
Q
what is glaucoma?
A
- decease affects optic nerve
- loss of peripheral vision
- lead to blindness if left untreated
- damage to optic nerve causes disruption to transmission of information from eye → brain
- associated with increased intra-occult pressure from the aqueous humour
9
Q
what are:
presbyopia
- Floaters
- Cataracts
- Age-related Macular
- Degeneration (AMD)
- Glaucoma
all examples of
A
how ageing affects visual perception
10
Q
how does genetics effect visual perception
A
- inherited visual disorders
- congenital disorders
- colour vision deficiency
11
Q
what are inherited visual disorders
A
- passed through offspring through their genes
- can occur during infancy, adolescence and early or late adulthood
- aforementioned age-related disorders have a genetic component to them
12
Q
what are congenital disorders
A
- present at child birth
- genetic factors or from disease/ deficiencies during pregnancy
- glucacoma, cataracts, achromatopasia
13
Q
what is colour vision deficiency
A
inherited disorder where the cone cells are missing or malfunction
14
Q
what are the three forms of colour vision deficiency
A
- monochromic
- Dichromacy
- Trichromacy
15
Q
what is Retinitis Pigmentosa
A
- genetic disease of retina
- gradual loss of prophetical vision
- night blindness
