Feature
The blue arcs: An electrifying visual phenomena
The proliferation of red LEDs on electronic equipment of every sort has made it easy to observe one of the more interesting entoptic phenomena. Normally, visual experiences are caused when light stimulates the retina, the network of nerve cells at the back of the eye. Entoptic phenomenon are produced when something other than light stimulates the retina. Thus, if you gently poke the side of the eye with your lids closed, you will see a spot of light on the opposite side of the visual field. This so-called pressure phosphene is caused by mechanical stimulation of nerve cells.
Log in or become a member to view the full text of this article.
This article may be available for purchase via the search at Optica Publishing Group.
Optica Members get the full text of Optics & Photonics News, plus a variety of other member benefits.