Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  shimmer, play(verb) a weak and tremulous light. 2  shimmer(verb) shine with a weak or fitful light. 3  shimmer(verb) give off a shimmering reflection, as of silk.
Cats, like humans, have both rods and cones in the retina. Rods are the receptors that the eye uses for night time viewing and sudden movement. Cones are used during the daytime, and process color information. Cats have more rods than cones, as compared with humans, making cat night vision superior to humans.
retinal receptor cells that are concentrated near the center of the retina and that function in daylight or in well- lit conditions. The cones detect fine detail and give rise to color sensations EX-sunny, spring day: photoreceptors: convert light energy to electrochemical neural impulses. EX-Both rods and cones are the photoreceptors: dark adaptation