File:Transactions (1865) (14775561871).jpg

Identifier: transactions07ameruoft (find matches)
Title: Transactions
Year: 1865 (1860s)
Authors: American Ophthalmological Society
Subjects: Ophthalmology
Publisher: New York (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: Ontario Council of University Libraries and Member Libraries

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FIG. VII. PHOTOGRAPHIC REPRODUCTION OF PACINIS FIGURESOF THE HUMAN RETINA. and Rods of the Himian Retina. 351 Fig. VII is a photographic reproduction of Pacinis drawingof the human retina, from sections and teasings of the fresh un-hardened retina examined in vitreous humor. The upper figurerepresents knobbed rods, a cone whose outer member becomescylindrical and continuous with a rod, also twin cones. Thelower figure is his diagrammatic view of the human retina. Helmholtz, Czermak, Nuel, Wolffberg, Olshausen, Exner,and Dimmer all agree in describing a shadow or a mosaic work,like shagreen leather, made visible entoptically by rays comingthrough the pupil and moving in the same direction as thediaphragm which is held in front of the eye. Probably this ap-pearance is due to the perforations in the external limitingmembrane made by the rods and cones. This would prove thatthe percipient element must lie still further out towards thechoroid, and the seat of light perception is therefore

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