There are two types of sensory receptors: rods and cones. Rods detect light, and cones detect shape.
Rods are used to detect variances in light and are perceived as black, grey and white. Cones are used to pick up colors.
Because your eyes have cones that detect color. Rods detect black and white.
Rods
Rods and cones detect/sense light coming in to make colors. Your brain then converts it to an image.
Rods detect low levels of light, specifically dim light and movement in our peripheral vision. They are responsible for our night vision and are highly sensitive to light, allowing us to see in low-light conditions.
Rod cells do not detect color. They are responsible for detecting low levels of light and are more sensitive to brightness and contrast rather than color. Cone cells, on the other hand, are responsible for detecting color.
The retinas of our eyes have rods and cones. Rods detect light intensity, and cones detect color. The cones do not work as well in dark conditions. That is why, for example, a dark blue car will appear black at night.
The photoreceptor cells of the retina, specifically the rods and cones, detect light. Rods are responsible for low-light vision, while cones are responsible for color vision and high-acuity vision.
That part of the vision that is perceived by the cones of the eye. Rods detect black and white.
The eye, specifically rods and cones.
There are two types. Rods, which are monochromatic, and give black and white vision and Cones, which detect colors. Rods are better in low light situations.