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).
Cone: A type of specialized light-sensitive cell (photoreceptor) in the retina of the eye that provides color vision and sharp central vision. By contrast, the rods are the retinal photoreceptors that provide side vision and the ability to see objects in dim light (night vision).