Final answer:
The retina includes two types of photoreceptor cells called rods and cones.
Step-by-step explanation:
The retina includes a photoreceptor layer containing two types of cells called rods and cones. Rods are strongly photosensitive and are located in the outer edges of the retina. They detect dim light and are used primarily for peripheral and nighttime vision. Cones, on the other hand, respond to bright light and are located near the center of the retina. Their primary role is in daytime and color vision.