Which type of vision is primarily responsible for color discrimination?

• A. Scotopic vision
• B. Mesopic vision
• C. Night vision
• D. Photopic vision

Answer: (D)

Color discrimination comes from cone photoreceptors in bright light. This mode of vision, called photopic vision, uses cones that are sensitive to different wavelengths, giving you the ability to distinguish colors and see fine detail. In low light, rods dominate (scotopic vision) and are not color-sensitive, so color discrimination diminishes. Mesopic vision is an intermediate state with both rods and cones active, offering limited color information compared to photopic. Night vision generally refers to low-light conditions and is dominated by rods, again with little color. So, color discrimination is primarily photopic vision.