refers to an impaired sensitivity to light that exists in the center of the visual field when light conditions are poorer. It is thought to be caused by the absence of rods in the fovea area of the eye [Dominique Arago (1786-1853), French physicist]

ARAGO PHENOMENON: "The arago phenomenon occurs when lighting conditions are poor, and generally exists in the middle of the visual field."
Cite this page: N., Pam M.S., "ARAGO PHENOMENON," in, April 7, 2013, (accessed September 16, 2021).