Color Vision Flashcards Preview

Ocular Physiology #2 > Color Vision > Flashcards

Flashcards in Color Vision Deck (65)
Loading flashcards...
1

what is the definition of color vision

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

2

what is the range of visible wavelengths that the eye can see

380-760 nm

3

what type of energy causes photoreactions on the retina to experience vision

electromagnetic

4

what is monochromatic light

colored light of a single wavelength

5

how do we see "white" light

it is created by mixing all colors created by a prism with a convex lens

6

what are the 3 additive primary colors

blue (435nm), green (545nm), and red (700nm)

7

what do the additive primary colors produce

white

8

what are the 3 subtractive primary colors

yellow, magenta-red, and cyan-blue

9

which light rays mix to create the subtractive primary colors

any two-thirds of the spectrum

10

what is subtractive color mixing

the mixing of color pigments or dyes

11

what do the subtractive primary colors produce

black

12

what are complementary colors

they have an additive mixture that forms white

13

what are interference colors

color that results from interference on thin films (soap bubbles)

14

why is the sky blue colored

the color was produced through the scatter of white light

15

which wavelengths, longer or shorter, become scattered as the rays pass through the atmosphere

the longer wavelengths

16

when do the sun's ray's give an intense red color

at sunrise and sunset, the sun's ray's pathlength is longer

17

which direction do the sun's rays pass though the atmosphere

vertically

18

what is the shared chromophore in all visual pigments chemically related to

vitamin A

19

what makes the rods and cone cell pigments different

different opsin proteins

20

the genes encoding the opsin proteins are all members of what related receptor

G protein coupled receptors

21

what are G proteins in rod and cone cells called

transducins

22

are there different transducin forms for the different cone types

no they all share a common transducin form

23

do rods and cones have the same transducin form

no they each have a specific form

24

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

11-cis isomer of aldehyde vitamin A

25

if the chromophore is in the opsin-bound state what happens

it has unique properties that contribute to color vision functioning

26

what is the opsin-shift

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

27

what cells are needed for scotopic vision

rod cells (dim light)

28

what cells are needed for photopic and color vision

cone cells (bright-light)

29

which cells are less sensitive, rods or cones

cones are less sensitive but they can mediate differentiation of colors

30

what wavelength is the maximum for a rod response

510 nm