Nursing Central is the award-winning, complete mobile solution for nurses and students. Look up information on diseases, tests, and procedures; then consult the database with 5,000+ drugs or refer to 65,000+ dictionary terms. Explore these free sample topics:
-- The first section of this topic is shown below --
[Gr. phos, light, + phainein, to show]
A flash of light caused by chemical, electrical or mechanical stimulation of the retina, as when rubbing a closed eye.