A person who can differentiate all colors and involves all three cones, but not necessarily functioning perfectly, is classified as a:

• Dichromat

• Monochromat

• Anomalous trichromat

• Achromat

Which type of dichromatism is characterized by blindness to red color due to the absence of Phorphyropsin pigment?

• Deuteranopia

• Tritanopia

• Protanopia

• Monochromatism

A person with Monochromatism can typically see:

• All colors with reduced sensitivity.

• Only red and green colors.

• Black, white, and shades of grey.

• Only blue and yellow colors.

Which type of anomalous trichromatism is described as a weakness to green color and is common (6%) and sex-linked?

• Protanomalous

• Deuteranomalous

• Tritanomalous

• Monochromat

Which of the following is an indication for performing a color vision test?

• Unexplained reduction in visual acuity.

• Normal visual acuity of 20/20.

• Absence of any systemic or ocular disease.

• History of normal color perception.

Which category of color vision tests includes the Ishihara Plates and AO-HRR Plates?

• Hue discrimination/Arrangement tests

• Anomaloscopes

• Pseudoisochromatic Test Plates

• Color naming and sorting tests

What is the recommended illumination for color vision testing using Ishihara plates?

• Dim room light

• 500-600 lux or daylight illumination

• Fluorescent light only

• Red-free illumination

In the Ishihara test, what is the maximum recommended time to answer numerals?

• 1 second

• 3 seconds

• 5 seconds

• 10 seconds

Which type of Ishihara plate is seen by a color normal subject but cannot be seen by a color deficient subject?

• Transformation plate

• Vanishing plate

• Hidden-digit plate

• Diagnostic plate

In the Ishihara test, a "Hidden-digit plate" is designed so that:

• A normal person sees a figure, but a CVD does not.

• A normal person does not see a figure, while a CVD will see it.

• Both normal and CVD subjects see the same figure.

• The figure appears different to normal and CVD subjects.