Which of the following settings would result in a brighter test field on the Nagel Anomaloscope?

The Nagel Anomaloscope is a device used to assess color vision, specifically to evaluate red-green color deficiencies. It operates by adjusting the intensity of two different light sources to obtain a color match, which helps to determine the ability of an individual to perceive colors accurately. The brightness of the test field is influenced by the settings of the device.

Choosing a setting of 87 on the Nagel Anomaloscope results in a brighter test field because it represents a higher intensity level for the light being assessed. As the scale increases, so does the brightness of the light; therefore, a setting towards the upper limit, such as 87, allows for maximum light output. This increased brightness not only facilitates a clearer visual assessment but also improves the subject’s ability to differentiate between the red and green components of the light presented in the test scenario.

Consequently, a setting of 87 enhances visibility and contrast in the color matching task, making it easier for individuals to make their assessments during the test.