Anomalies of Color Vision Questions
and Answers
1. Refer to the D15 result shown on the screen. This individual most likely has
a. normal color vision
b. deuteranomaly
c. tritanopia
d. monochromacy - ANS-B.
1. Screening for red/green color vision anomalies in children is important because such
defects could
a. develop into a monochromacy
b. be reversed with available treatments
c. develop into tritanomaly
d. affect performance on color-coded school lessons - ANS-D.
1. Which of the color vision tests are you most likely to use in clinic?
a. Ishihara Test
b. D15
c. Anomaloscope
d. Cone Contrast Test - ANS-A.
A child with normal visual acuity fails a pseudoisochromatic plate test. The most likely
diagnosis is
a. anomalous trichromacy
b. dichromacy
c. glaucoma
d. juvenile stargardts disease - ANS-A.
A female patient demonstrates a moderate deuteranomaly during your exam. What is
the likelihood her father also has deuteranomaly ?
a. 0%
b. 25%
c. 50%
d. 100% - ANS-D.
A female patient demonstrates a moderate deuteranomaly during your exam. What is
the likelihood her father also has deuteranopia?
a. 0%
b. 25%
c. 50%
d. 100% - ANS-A.
A patient with deuteranomalous trichromacy adjusts the Nagel
, anomaloscope so that the mixture and test fields match each other. He
subsequently stares at a large green light and then views his original
match. He will most likely report that:
a. the two fields are no longer matched to each other for hue
b. the two fields are no longer matched to each other for brightness
c. the two fields remain perfectly matched to each other - ANS-C.
A patient with protanomalous trichromacy makes a match on the Nagel
anomaloscope. When viewed by a normal trichromat, the mixture field
may appear:
a. green
b. red
c. achromatic - ANS-B.
A patient with protanopia matches 670 nm to 590 nm in an
anomaloscope. When viewed by a person with normal color vision, the
590 nm will appear:
a. brighter than the 670 nm
b. dimmer than the 670 nm
c. the same brightness as the 670 nm - ANS-B.
A patient with which of the following color vision deficiencies is most
likely to have a recent history of color naming errors?
a. deutan
b. protan
c. tritan - ANS-C.
A person with monochromacy compares his vision when looking
through a red filter to his vision without a red filter. Using the red filter
in this way, this individual will function as if he has:
a. one photopigment
b. two photopigments
c. three photopigments
d. four photopigments - ANS-B.
A person with protanopia is presented with two patches of light. One
patch consists of 560 nm and the other of 600 nm. By proper adjustment
of their intensities, this individual can match these two patches so that
they appear to have the same:
a. brightness
b. hue
c. saturation
d. "a," "b," and "c" are all correct - ANS-D.
and Answers
1. Refer to the D15 result shown on the screen. This individual most likely has
a. normal color vision
b. deuteranomaly
c. tritanopia
d. monochromacy - ANS-B.
1. Screening for red/green color vision anomalies in children is important because such
defects could
a. develop into a monochromacy
b. be reversed with available treatments
c. develop into tritanomaly
d. affect performance on color-coded school lessons - ANS-D.
1. Which of the color vision tests are you most likely to use in clinic?
a. Ishihara Test
b. D15
c. Anomaloscope
d. Cone Contrast Test - ANS-A.
A child with normal visual acuity fails a pseudoisochromatic plate test. The most likely
diagnosis is
a. anomalous trichromacy
b. dichromacy
c. glaucoma
d. juvenile stargardts disease - ANS-A.
A female patient demonstrates a moderate deuteranomaly during your exam. What is
the likelihood her father also has deuteranomaly ?
a. 0%
b. 25%
c. 50%
d. 100% - ANS-D.
A female patient demonstrates a moderate deuteranomaly during your exam. What is
the likelihood her father also has deuteranopia?
a. 0%
b. 25%
c. 50%
d. 100% - ANS-A.
A patient with deuteranomalous trichromacy adjusts the Nagel
, anomaloscope so that the mixture and test fields match each other. He
subsequently stares at a large green light and then views his original
match. He will most likely report that:
a. the two fields are no longer matched to each other for hue
b. the two fields are no longer matched to each other for brightness
c. the two fields remain perfectly matched to each other - ANS-C.
A patient with protanomalous trichromacy makes a match on the Nagel
anomaloscope. When viewed by a normal trichromat, the mixture field
may appear:
a. green
b. red
c. achromatic - ANS-B.
A patient with protanopia matches 670 nm to 590 nm in an
anomaloscope. When viewed by a person with normal color vision, the
590 nm will appear:
a. brighter than the 670 nm
b. dimmer than the 670 nm
c. the same brightness as the 670 nm - ANS-B.
A patient with which of the following color vision deficiencies is most
likely to have a recent history of color naming errors?
a. deutan
b. protan
c. tritan - ANS-C.
A person with monochromacy compares his vision when looking
through a red filter to his vision without a red filter. Using the red filter
in this way, this individual will function as if he has:
a. one photopigment
b. two photopigments
c. three photopigments
d. four photopigments - ANS-B.
A person with protanopia is presented with two patches of light. One
patch consists of 560 nm and the other of 600 nm. By proper adjustment
of their intensities, this individual can match these two patches so that
they appear to have the same:
a. brightness
b. hue
c. saturation
d. "a," "b," and "c" are all correct - ANS-D.
