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).
The cones are responsible for our color vision and, it so happens, for those with normal color vision, there are three specific types of cones, which are maximally responsive to three different wave lengths. For most people, these preferred wave lengths represent the colors red, blue, and green.