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).
Cones and Rods. This density map shows the retina, which is made up of cones and rods. Cones perceive color and rods perceive shadow in images. In the fovea, which is responsible for sharp central vision, there is huge density of cones but no rods.