(from the article `eye disease`) Flashing lights in the field of vision are caused by stimulation of the retina by mechanical means. Most commonly this occurs when the vitreous ...
Found on
http://www.britannica.com/eb/a-z/f/34
(from the article `lighthouse`) ...belong. The regulations are too lengthy to quote in full, but essentially a lighthouse may display a single flash, regularly repeated at perhaps ...
Found on
http://www.britannica.com/eb/a-z/f/34
rhythmic light in which every appearance of light (flash) is of the same duration, and, except possibly for rhythms with rapid rates of flashing, the total duration of light in a period is clearly shorter than the total duration of darkness NOTE - The term eclipse is used for the interval of darkness between two successive appearances of light.
Found on
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=845-11-11
No exact match found.
