The visual phenomenon usually referred to as "the reddish-blue arcs and the reddish-blue glow of the retina" is one that has attracted the attention of several investigators, who are not in agreement as regards its explanation. Therefore it seemed worth while to undertake further experimental investigations of this unique phenomenon.
The arcs may be observed under the following conditions : When, in a dark room, a small rectangle of light is made to fall on the temporal side of the macula, near the fovea and near or in the region of the median line, there are seen, circling the fixation point, two glowing blue arcs which have their origin at the upper and lower edges of the rectangle of light, and which terminate converging toward the blind spot. Recently there has been considerable discussion concerning the cause of this phenomenon. The very nature of the phenomenon presents unusual obstacles to an
SNELL PA. THE ENTOPTIC PHENOMENON OF THE BLUE ARCS: A STUDY OF THE SECONDARY EXCITATION IN THE RETINA. Arch Ophthalmol. 1929;1(4):475–493. doi:10.1001/archopht.1929.00810010493007
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