lecture 6: anomalies of color vision

A yellow background is used when performing short-wavelength automated perimetry because this background:

b) suppresses the M- and L-cones

According to Köllner’s rule, age-related macular degeneration is most likely to result in which type of color vision defect?

c) tritan

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:

c) the two fields remain perfectly matched to each other

Screening for red/green color vision anomalies in children is important because such defects could:

a) affect performance on color-coded school lessons

Which of the following pairs of colors is least likely to be confused by a patient with a deutan color vision anomaly?

d) red and blue

A patient with protanomalous trichromacy makes a match on the Nagel anomaloscope. When viewed by a normal trichromat, the mixture field may appear:

b) red

A patient with which of the following color vision deficiencies is most likely to have a recent history of color naming errors?

c) tritan

Which of the following pairs of wavelengths appear most similar to a patient with protanopia?

d) 540 nm, 545 nm

As the mixture field of the Nagel anomaloscope is adjusted:

a) luminance remains constant

For a patient with deuteranomalous trichromacy, our best guess as to the location of the peak of his/her abnormal M-cone absorption spectra is:

c) 540 nm

A women’s mother has a deutan color vision anomaly and her father and husband have normal color vision. What percentage of her sons are expected to have a color vision anomaly?

c) 50%

The foveola of a person with red–green dichromacy contains how many types of photopigments?

a) one

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:

b) two photopigments

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:

all of the above

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:

b) dimmer than 670 nm

The expected visual acuity for an adult patient with deuteranopia (inherited) is closest to:

a) 20/20

Pseudoisochromatic plate tests do not differentiate between which types of color vision anomalies:

d) both b & c

Which of the following color vision tests is best suited to assess a patient suspected of having outer retinal disease?

c) D-15

A child with normal visual acuity fails a pseudoisochromatic plate test. The most likely diagnosis is:

a) anomalous trichromacy

Which type of color vision anomaly is least likely to be the same in each eye?

c) tritan