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.
CONE CELLS are the second type of light sensitive cells in the retina of the eye. The human retina contains 6-7 million cones; they function best in bright light and are essential for acute vision (receiving a sharp accurate image).
Rods are important for seeing black, white, and gray; cones are the receptors responsible for color vision, and are separated into three types: red-sensitive, green-sensitive, and blue-sensitive. In order to see all the colors of the rainbow, combinations of these three color receptor cones must be activated simultaneously.