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Ocular Physiology 2 > Color vision > Flashcards

Flashcards in Color vision Deck (42)
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1

What is color vision

The ability to discriminate a light stimulus as a function of its wavelength

2

What are the wavelengths of the visible spectrum

380-760 nm

3

What is monochromatic light

Colored light of a single wavelength

4

What does remixing of all colors of light create by a prism

the sensation of white

5

What are the additive primary colors

Blue (435)
Green (545)
Red (700)
These add to produce white color

6

What are the subtractive primary colors

Yellow, magenta-red, and cyan-blue add up to produce black

7

What are complementary colors

additive mixture that forms white

8

what are interference colors

color that results from intereference on thin films like soap bubbles

9

How can color be produced

through the scatter of white light (blue sky)

10

What do all human visual pigments share

a common chromophore, related to vitamin A

11

The rod and cone cell pigments are all complexes of the same chromophore but have different _____

opsin proteins

12

What are the genes encoding the opsin proteins related receptors of

G protein coupled receptors

13

What are the G proteins in rod and cone cells callled

transducins

14

T/F the three c one types share a common transducin

True

15

What reacts with an opsin protein to form a photoreceptor - pigment complex

11 cis isomer of aldehyde vitamin A

16

In the _____ state, the chromophore has unique properties that contribute to color vision functioning

opsin bound state

17

This refers to the change in the absorption of the chromophore when it becomes bound to a particular opsin

opsin shift

18

What is the point of contact between radiated energy, light and nervous system

Retina

19

What do rod cells mediate

scotopic (dim light) vision

20

what do cone cells mediate

phototopic (bright light) color vision

21

What did the Young-Hemholtz Theory emphasize

Trichromacy and was confirmed by the discovery of 3 cone photoreceptor systems

22

Is Karl Hering' opponent theory true? And what was the conclusion

Not true, but his theory was correct in the sense that the signals from the three cone types are combined, not at the pigment level as he had suggested, but at the level of neurons to produce opposing pairs of red-green blue-yeloow, and black-white

23

Human color vision is _____

trichromatic

24

T/F The peaks of absorbance vary of three cone types, but their absorbance spectra overlap considerably

TRUE

25

T/F The response of a cone cell is the same no matter what the energy is of the photon that it captures

True

26

Only the ____ of photon capture varies with photon energy, and the dynamic output relates only to the rate of photon capture

efficiency

27

What is the peak of photopic curve

555 nm

28

What is the peak of scotopic curve

505 nm

29

What are the severely affected ind

Dichromats

30

What is the most common type of color vision defect

Deuteranomaly