Vision Flashcards

1
Q

amplitude

A
  • height of wave
  • higher is brighter
  • lower is duller
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2
Q

wavelength

A
  • higher wavelength is a lower frequency

- lower wavelength is a higher frequency

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3
Q

purity

A

impacts the % of saturation or richness of colours

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4
Q

pure light

A

light made up from one wave length

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5
Q

natural light

A

light made up of multiple wave lengths

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6
Q

lights trhough the eye

A

1) cornea
2) pupil
3) iris
4) lens
5) vitreous humour
6) retina

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7
Q

cornea

A

transparent window at front of the eye

responsible for ~80% of focusing power

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8
Q

pupil

A

round window in middle of eye (black dot)

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9
Q

iris

A

controls size of pupil
if dim out dilates
if bright out contracts

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10
Q

lens

A

final focusing of light
project image onto retina
is curved

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11
Q

curved lens

A

project image upside down and backwards onto retina, brain compensates

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12
Q

flexible lens

A

close object:lens get rounder

far object: lens elongates

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13
Q

vitreous humour

A

clear jelly

holds eye together

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14
Q

retina

A

made of 3 layer
1) photoreceptors
2 & 3) horizontal and amacrine cells

photoreceptors beside retinal pigment epithelium because it is its energy source

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15
Q

cones

A
6 million
used for day vision
allow to see colour
good visual acuity
concentrated toward fovea
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16
Q

rods

A
125 million 
periphery vision
used for night vision
provide no colour info
poor visual acuity
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17
Q

neural signals pathway

A

photoreceptors > bipolar cells > ganglion cells

18
Q

blind spot

A

due to lack of photo receptora on the optic disc

19
Q

cones grouping

A

direct connection to brain

high visual acuity

20
Q

rods grouping

A

less direct connection to brain

lower visual acuity

21
Q

left brain gets infor from

A

right nasal retina

left temporal retina

22
Q

right brain gets info from

A

left nasal retina

right temporal retina

23
Q

main pathway

A

most axons synapse in the LGN

24
Q

primary visual cortex

A

V1

in occipital lobe

25
extrastriate cortex
visual processing area in the occipital lobe
26
visual info pathway
ganglion to 1 LGN | many LGN to 1 V1 cell
27
dorsal stream
where | parietal
28
ventral stream
what | temporal
29
light sensitive path
jelly fish and worms
30
curved "cup" eye
allow direction of light to be sensed
31
crude lens
allowing input from stimulus from different distances
32
compound eye
good at detecting movement close up
33
simple eye
differ depending on enviroment
34
large eyes
can benefit eith acuity or night acuity
35
lateral eyes
prey | bad depth perception
36
forward eyes
predator | increased depth perception
37
eye development
2 month prenatul: eyes form 6 months prenatul: react to light random firing determines how cells will connect newborn: weak lens muscles 3 months old: almost adult like focus 11 years: visual brain area full developed
38
visual acuity development
birth (20/600) 6 months (20/100) 4-6 years (fully reach acuity)
39
man who only shaved half face, ate half plate of food
NOT VISUAL DEFECIT attention issue parietal lobe damage
40
brain assumes _____ light source
one
41
blind people can
still show emotional and action blind spot
42
sclera
a tough structural membrane that covers to portion of the eye not covered by the cornea