Visual fields

Question 1

visual field

Answer 1

all the space that one eye can see at any given instant

Question 2

we have natural blind spot

Answer 2

no photoreceptors in optic disc
means natural blind spot

Question 3

Hill of vision

Answer 3

• you have ur central vision looking directly ahead
• you have ur peripheral vision on the side
• think of it like a mountain with central at the top and going downward the side vision
• and then if some parts are missing or flat that is the bit that is damaged

Question 4

example of perimeters

Answer 4

humphrey field analyzer 3
henson pro
octopus 900
icare COMPASS
topcon tempo

Question 5

what structures determine level of vision

Answer 5

retina
optic disc
visual cortex

Question 6

our eyes in daylight

Answer 6

• can see beat in detail wheb long straight ahead
• can detect movement better in peripheral vision than central
• colour vision better in central than peripheral vision
• can detect dimmer lights within central vision than peripheral

Question 7

hill of vision changes in eye disease

Answer 7

• can become flatter
• the area that makes up the sea of darkness becomes bigger
• dips in the surface as vision becomes patchy

Question 8

changes in visual field can have impact on life

Answer 8

• unable to drive
• may have mobility issues
• can’t work in certain places

Question 9

what can affect visual field?

Answer 9

changes in eye: droopy eyelids, diseases that affect retina and optic disc

changes in brain and visual pathway: diseases that affect optic nerve, diseases that affect parts of brain

Question 10

kinetic perimetry

Answer 10

• stimulus moved from area where it is not seen towards area where it is just seen
• testing with diff size lights to find the edge of the hill of vision

Question 11

static perimetry

Answer 11

• uses a stationary stimulus
• change from non seeing (dim) to seeing(bright)
• done with lights in diff locations to find the height of hill of vision in that location