Which cells mediate high-acuity color vision in bright light?

Which cells mediate high-acuity color vision in bright light?

• A. Bipolar cells
• B. Cones
• C. Rods
• D. Ganglion cells

Answer: (B)

High-acuity color vision in bright light is produced by cones. In photopic (bright) conditions, cones are the active photoreceptors; they have small receptive fields and, especially in the fovea where they are densely packed, connect to visual pathways in a way that yields high spatial resolution. The three cone pigment types enable color discrimination, so cones carry both fine detail and color information. Rods, by contrast, are highly sensitive in dim light but offer low spatial resolution and no color information, and they saturate in bright light. Bipolar and ganglion cells are important for transmitting signals from photoreceptors to the brain, but the actual capability for color and sharp vision in bright conditions comes from the cones.

High-acuity color vision in bright light is produced by cones. In photopic (bright) conditions, cones are the active photoreceptors; they have small receptive fields and, especially in the fovea where they are densely packed, connect to visual pathways in a way that yields high spatial resolution. The three cone pigment types enable color discrimination, so cones carry both fine detail and color information. Rods, by contrast, are highly sensitive in dim light but offer low spatial resolution and no color information, and they saturate in bright light. Bipolar and ganglion cells are important for transmitting signals from photoreceptors to the brain, but the actual capability for color and sharp vision in bright conditions comes from the cones.