What are the main photoreceptors for daytime vision?

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

Answer: (B)

Cones are the photoreceptors used for daytime vision. They operate in bright light and provide high visual acuity and color discrimination, thanks to three cone types sensitive to different wavelengths. They’re densely packed in the fovea, supporting sharp central vision. In daylight, rods saturate in bright conditions and don’t offer fine detail or color information, so they don’t drive daytime vision as cones do. Bipolar and ganglion cells are downstream neurons that relay signals to the brain, but they are not photoreceptors themselves.