16 Color Deficiency

Question 1

Slide 2: It is known that L:M cone ratios vary considerably. Will an individual with a lower L:M ratio have less color perception than an individual with a higher L:M ratio?

Answer 1

No.

Question 2

Slide 2: T/F: If a normal-sighted person wears rose-colored glasses for a few weeks, eventually the visual system will normalize the color perception and the individual will see normally.

Answer 2

True

Question 3

Slide 3: T/F: An individual with normal color vision has three peak wavelengths in their cone spectra, while protanopes and deuteranopes also have three peak wavelengths but at different frequencies.

Answer 3

False. Protanopes and deuteranopes are missing specific peak wavelengths

Question 4

Slide 9 : What cones on the x- chromosome?

Answer 4

M and L rhodopsin

Question 5

Slide 10 : True or False L-cone pigment expressed by single X chromosome gene?

Answer 5

True

Question 6

Slide 11: True or False . M-cone pigment expressed by single X chromosome genes?

Answer 6

False , ( several )

Question 7

slide 9 : Color blind is more prevalence in males or Females?

Answer 7

Males

Question 8

slide 12: which is more prevalence Protanomaly or Deuteranomaly in males ?

Answer 8

Deuteranomaly

Question 9

slide 13 : True or False Anomalous trichomats have less severe color deficiency?

Answer 9

True

Question 10

slide 10 : L cone deficiency is more common than M cone

Answer 10

False

Question 11

Slide 5: T/F Dichromats have more difficulty distinguishing objects of similar color when the objects are in motion.

Answer 11

False.

Question 12

Slide 6: The chromophore is located in these two bands in the Rhodopsin sequence.

Answer 12

VI and VII

Question 13

Slide 7: Which chromosomes are rhodopsin pigment expressed in?

Answer 13

3, 7, and X

Question 14

Slide 8: T/F The L and M pigments are found in the X chromosome.

Answer 14

True

Question 15

Slide 7: Which chromosomes are the S pigment expressed in?

Answer 15

Chromosomes 3 and 7

Question 16

Slide 19: With the Lanthony-Farnsworth D-15 mapping, patient has trouble with numbers 3 and 12. Patient most likely has which type of color deficiency?

Answer 16

Protanope

Question 17

Slide 19: T/F: With Lanthony-Farnsworth D-15 mapping colors are laid out to cross all three different confusion lines.

Answer 17

True

Question 18

Slide 20: T/F: Rod monochromasy is a rare defect where patient does not have any cones.

Answer 18

True

Question 19

Slide 21: T/F: Farnsworth 100-hue is a desaturated test.

Answer 19

False, it is saturated.

Question 20

Slide 21: T/F: Farnsworth 100-hue is a more popular test because it takes less time to administer.

Answer 20

False, it is less popular and takes a longer time to administer.

Question 21

Slide 14: T/F Hybrid genes shift the cone peak sensitivity

Answer 21

True

Question 22

Slide 14: What is the peak sensitivity (in nanometers) for a trichromat with a normal L-cone?

Answer 22

560

Question 23

Slide 15: What do the confusion lines in a CIE color space represent?

Answer 23

The hues that an individual with a color deficiency has TROUBLE distinguishing.

Question 24

Slide 15: Adding the spaces between the confusing lines in a CIE color space sums up to?

Answer 24

The number of different hues that the individual is ABLE to distinguish.

Question 25

Slide 16: How many different hues can Tritanopes distinguish?

Answer 25

11

Question 26

Slide 18: In this color deficiency test, the patient is presented with desaturated color disks and must arrange them in a particular order based on color.

Answer 26

Farnsworth D-15 color test