15- Color Vision

Flashcards about Color Vision

What is color vision?

The ability to discriminate a light stimulus as a function of its wavelength.

What are the additive primary colors?

Blue, green, and red. They add up to white.

What are the subtractive primary colors?

Yellow, magenta-red, and cyan-blue.

When subtractive colors are mixed, what color is produced?

Black

What are subtractive colors?

Mixing of color pigments or dyes.

Visual pigments are related to which vitamin?

Vitamin A

Which cone system is NOT one of the three types?

Long (yellow) --> K sensitive

At what nanometer is the peak of the photopic curve?

555nm (daylight)

At what nanometer is the peak of the scotopic curve?

505nm (dim light)

What is the most common type of color vision defect?

Red-green color deficiency, or deuteranomaly.

Approximately what percentage of males are affected by red-green color deficiency?

10%

What are dichromats?

Individuals missing one of the three photopigments.

What is tritanopia?

The loss of S sensitive wavelength.

What is protanopia?

The loss of an L sensitive wavelength.

What is deuteranopia?

The loss of an M sensitive wavelength.

What pigment is missing in Deuteranope?

Missing chlorolabe (CD) - M

What pigment is missing in Protanope?

Missing erythrolabe (PE) - red - L

What pigment is missing in Tritanope?

Missing cyanolabe (CT) - blue - S

What type of color vision defect would you see in acquired efficiency?

Not inherited - secondary to disease – blue yellow

Can prediabetes cause color vision deficiency?

Yes, it can.

Can cataracts cause color vision deficiency? What type is most common?

Yes; nuclear sclerotic cataract most common.