Which cells are more light sensitive and support peripheral vision?

• A. Cones are more light sensitive and support peripheral vision.
• B. Rods are more light sensitive and support peripheral vision.
• C. Rods detect color in bright light.
• D. Cones are used primarily for peripheral vision.

Answer: (B)

Rods are the photoreceptors that are highly sensitive to light and confer vision in dim conditions, especially in the periphery of the retina where they outnumber cones. Because they’re concentrated toward the peripheral retina, rods support peripheral vision and motion detection rather than sharp, color-rich detail. Cones, in contrast, require more light and provide high-acuity central vision and color perception, with the highest density at the fovea.

So the statement that rods are more light sensitive and support peripheral vision is the best fit. The other options misstate the roles: cones aren’t the most light sensitive and aren’t primarily for peripheral vision; rods don’t detect color in bright light (that’s the cones’ job).