As light enters the eye, it strikes the cells receptor cells of the retina called the rods and cones. A chemical reaction results in the formation of electric impulses, which then travel to the brain through the optic nerve.
Reviewed last on: 9/16/2008
Paul B. Griggs, MD, Department of Ophthalmology, Virginia Mason Medical Center , Seattle , WA . Review provided by VeriMed Healthcare Network.