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. Cones are the cells capable of color vision and responsible for high spatial acuity. Unlike the rods, cones do not have individual disks to hold the photochemicals. Photochemicals are in the outer membrane of the cell, and the shape of the cone is determined by folding of the outer membrane.