Which of the following describes the visual effect of light-sensitive cells in bright conditions?

Photopic vision refers to the type of vision that occurs under well-lit conditions, where the light-sensitive cells in the retina, particularly the cones, are predominantly active. Cones are responsible for color perception and visual acuity in bright light, making photopic vision crucial for seeing details and colors in daylight or well-illuminated environments. This visual system is highly adapted to daylight conditions, allowing individuals to perceive a wide range of colors and fine details.

In this context, the other options represent different conditions of vision. Scotopic vision pertains to low-light conditions where rods, the cells used for night vision, are primarily active, and color perception is minimal. Mesopic vision occurs in intermediate lighting situations, utilizing both rods and cones, but it is not the state of vision associated with bright light. Night vision specifically describes the ability to see in darkness, which relies almost entirely on rod cells and is distinct from the function of photopic vision. Thus, photopic vision is the correct descriptor for the function of light-sensitive cells in bright conditions.