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).
Both the eye and the brain are involved in color perception. At least for humans with typical eyes, green is in the center of the visible range, and can be detected at lower levels than most other colors because two of the three types of cones respond to it - both the green one and half of the red one.