The human eyes consist of two major types of imaging sensor organs named as rods and cones, in which, the cones help to detect the color and the rods help to detect the brightness level but, not the color variations. Both rods and cones are sensitive to light.cones do not constitute the ability to extreme before the rods functionality. The reason behind that fact is the cones
However, the cones do not constitute the ability to the extreme, before the rods functionality. The reason behind that fact is, the cones form a poor degree of color invisibility, which is not much effective to detect the objects in dark whereas, the rods possess high capability to detect the brightness and light range even in the dim lighting. Due to this reason, everything appears to be black and white light shade formations.