Abstract
As early as 1825, Purkinje<sup>1</sup>called attention to a phenomenon that has become more intriguing as more facts have been added concerning it. If an observer in a dark room, preferably with one eye closed, looks a little to the temporal side of a circle or band of light, he will see, in addition to the source of light (the primary stimulus), two curved bands of bright blue beginning at the stimulating light and arching across the visual field to the region of the blind spot. At times the enclosed elliptical area is also filled with a faint blue haze. Several subsequent workers (Zeeman,<sup>2</sup>Tscherning<sup>3</sup>and Hubbard<sup>4</sup>) independently reported the same discovery, being incognizant of Purkinje's original paper because of its inaccessibility. The cause of the phenomenon has been explained in varying ways. While Purkinje recognized a relationship to the anatomic structure of the retina, he
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
