A Deuteranope will set the test scale to approximately which value on the Nagel Anomaloscope to achieve a match?

A Deuteranope is an individual with a type of color vision deficiency characterized by an inability to perceive green light due to a lack of functioning M-cones (middle wavelength cones). In a Nagel Anomaloscope test, individuals match a test light made up of wavelengths from the red and green spectrum to a yellow comparison light. For a Deuteranope, the ability to perceive green is severely limited, leading to a reliance on the red portion of the spectrum to achieve a match.

Typically, a Deuteranope will adjust the red and green light values until they produce a color that appears indistinguishable from the yellow reference light. Research and clinical observations have shown that Deuteranopes usually set the scale around a specific value, which reflects how much red light they need to mix with a minimal amount of green to create a suitable match. This value generally falls into a known range, with an approximate match setting being around 17 on the scale of the Nagel Anomaloscope.

The other values provided, while they could represent settings for individuals with varying color vision capabilities, do not align with the specific characteristics and color matching behaviors typical of a Deuteranope. Thus, a setting of 17 is consistent with the expected