Color Vision 3

Question 1

What’s the most common inherited CV disorder?

Answer 1

Red-Green

• 1 in 12 males
• 1 in 200 females

Question 2

Dichromats are termed the _______. What are they missing?

Answer 2

• anopia

- missing 1 of 3 photopigments

Question 3

Anomalous trichromats are termed _______. What is wrong with them?

Answer 3

• anomaly

- all 3 cones are present, but one cone is different/malfunctioned

Question 4

In deuteranopia, what cone photopigment is missing? What replaces it?

Answer 4

• chorolabe (green) is missing

- erythrolabe replaces it

Question 5

In protanopia, what cone photopigment is missing? What replaces it

Answer 5

• Erythrolabe is missing

- Chorolabe replaces it

Question 6

In tritanopia, what cone photopigment is missing?

Answer 6

Cyanolabe

Question 7

This model describes when the missing photopigment is replaced by a remaining photopigment.

Answer 7

Replacement model of Dichromacy

Question 8

What is the most common color vision anomaly?

Answer 8

Deuteranomaly

deuteranomalous trichromacy

Question 9

In Deuteranomalous Trichromacy, chorolabe is displaced where?

Answer 9

• chorolabe is displaced toward longer wavelengths (toward the right)

Question 10

In Protanomalous Trichromacy, erythrolabe is displaced where?

Answer 10

• erythrolabe is deplaced toward shorter wavelengths (to the left)

Question 11

Deutan/Protan deficits confuse what 2 colors?

Answer 11

red and green (usually inherited)

Question 12

Tritan deficits confuse what 2 colors?

Answer 12

blue and yellow

Question 13

The Trichromat spectral sensitivity curve shows how many peaks?

Answer 13

3 peaks

Question 14

In deuteranopia, the SSC shows how many peaks? Which one is missing?

Answer 14

• only 2 peaks

- missing MW peak

Question 15

In protanopia, the SSC shows how many peaks? What’s missing?

Answer 15

• 2 peaks

- missing LW peak

Question 16

This is the loci of color in a CIE diagram that appear identical to a dichromat.

Answer 16

Color Confusion lines

Question 17

This is a point where the color confusion lines converge and meet on the chromaticity diagram

Answer 17

Copunctal (convergence) point

Question 18

For protanopes, where is the copunctal point?

Answer 18

700nm

Question 19

For tritanopes, where is the copunctal point?

Answer 19

400nm

Question 20

For deuteranopes, where is the copunctal point?

Answer 20

outside the CIE diagram

Question 21

Is the color at each copuntcal point real or imaginary?

Answer 21

imaginary

Question 22

Protanopes and deuteranopes share a confusion line _____ to the spectral locus.

Answer 22

parallel

Question 23

This is a spectral wavelength that a dichromat selects to match a specified white light

Answer 23

Neutral pint

Question 24

What are the neutral points for protanopia, tritanopia and deuteranopia?

Answer 24

Protan = 492nm
deutan = 498nm
tritan = 569nm

Question 25

At what wavelength do protanopes and deuteranoepes become monochromats?

Answer 25

beyond 545 nm

Question 26

Can someone be a deuteranomalous dichromat?

Answer 26

NO

Question 27

Which condition shows a significant change in luminance function compared to normal trichromats?

Answer 27

Protanopia

Question 28

Which cones play a larger role in generating the photopic luminance function curve?

Answer 28

LWS cones

Question 29

What will a person with protanopia have difficulty doing?

Answer 29

Seeing the red tail-lights on cars

Question 30

Based on the W curve, what will a stimulus of 446 and 450 look like to a normal trichromat?

Answer 30

look similar

Question 31

Based on the W curve, what will a stimulus of 500 and 504 look like to a normal trichromat?

Answer 31

looks different

Question 32

Dichromats (protanopia/deuteranopia) have the best wavelength discrimination where?

Answer 32

490 and 495

Question 33

If a person confuses wavelengths along the spectral locus of 540 and 680, what type of deficiency do they have?

Answer 33

Unknown; can’t tell based off that