Scotopic vision refers to the ability of the human eye to see in low-light conditions, primarily using rod cells in the retina. These rod cells are highly sensitive to light but do not detect color, which is why vision in dim light appears mostly in shades of gray. Scotopic vision is most effective in darkness or twilight, allowing for basic visual perception when bright light is unavailable. During scotopic vision, the pupil dilates to allow more light to enter the eye, enhancing visibility. This type of vision is crucial for activities like night driving or navigating in dark environments. However, it has limitations, such as reduced visual acuity and difficulty in distinguishing fine details.