Rod, one of two types of photoreceptive cells in the retina of the eye in vertebrate animals. Rod cells function as specialized neurons that convert visual stimuli in the form of photons (particles of light) into chemical and electrical stimuli that can be processed by the central nervous system.How many rods does a human eye have?
There are approximately 120 million rods and 6 million cones in the eye. Rods are active for vision at night and cones are for daylight and colour reception.Where are rods in the eye located?
Named for their cylindrical shape, rods are concentrated at the outer edges of the retina and are used in peripheral vision. There are about 120 million rod cells in the human retina.