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.
These 10 animal facts will amaze you. A cone cell or simply âconeâ is a specialized light-sensitive cell found in the retina of the eye and used for discrimination of color and detail. In humans, three cone cell types are present, sensitized to different ranges of wavelength to provide a range of color perception.