Retinal signal processing Lec 17

Question 1

Retinitis Pigmentosa (RP)

Answer 1

Genetic eye conditions that leads to incurable blindness
tunnel vision
Mutation of genes for rhodopsin
degeneration of rods and eventually cones

Question 2

Age-related Macular degeneration (AMD)

Answer 2

Wet- abnormal blood vessels behind the retina grow under macula- leaking and damage retina
Dry- RPE and photoreceptors of the macula degenerate
-accumulation of drusen
-loss of central vision and acuity

Question 3

Diabetic retinopathy

Answer 3

diabetes mellitus
Blurry vision with macular edema
vessels bleed into retina and block vision

Question 4

Partial color blindness

Answer 4

abnormal red-green vision

Question 5

Trichromatic vision

Answer 5

Normal

Question 6

Deuteranopia vision

Answer 6

No expression of M opsin

Question 7

Protanopia vision

Answer 7

No expression of L opsin

Question 8

Tritianopia vision

Answer 8

no expression of S opsin- uncommon

Question 9

On center/ off surround

Answer 9

Light in center- excitation (depol)
Light in surround- inhibition (hyperpol)
Excitatory- spot of light against dark background
inhibitory- dark spot against light background

Question 10

Off center/ On surround

Answer 10

Light in center- inhibition (hyperpol)
Light in surround- excitation (depol)
Excitatory- Dark spot against light background
Inhibitory- light spot against dark background

Question 11

On BCs

Answer 11

Depolarize in light

Hyperpol in dark

Question 12

Off BCs

Answer 12

Hyperpol in light

Depol in dark

Question 13

Three cone types

Answer 13

L(red)
M(green)
S(blue)

Question 14

Parvocellular pathway

Answer 14

P ganglion

Question 15

Megnocellular pathway

Answer 15

M ganglion

Question 16

Koniocellular

Answer 16

Small bistratified yellow-blue ganglion cells

Question 17

M cells

Answer 17

Periphery
Not color sensitive
good light and contrast sensitivity and temporal resolution

Question 18

P cells

Answer 18

Small receptive field
High acuity and color sensitivity
Poor light and contrast sensitivity
In fovea
-1 BC---1 cone

Question 19

K cells

Answer 19

Carry short wavelength (blue) info

Question 20

Intrinsically photosensitive retinal ganglion cells

Answer 20

Important role in non-image forming vision