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Author: Special Libraries Association
Publisher:
ISBN:
Category : Libraries
Languages : en
Pages : 578
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Book Description
Author: Special Libraries Association
Publisher:
ISBN:
Category : Libraries
Languages : en
Pages : 578
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Book Description
Author: Harold E. Henkes
Publisher: Springer Science & Business Media
ISBN: 9400906412
Category : Medical
Languages : en
Pages : 151
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Book Description
When the eyeball is indented in total darkness, within less than 200 mil liseconds an oval or quarter-moon shaped spot of light is perceived in the part of the visual field corresponding to the indented region of the retina. In the seconds following, this phosphene extends across the whole visual field and alters in structure during further eyeball indentation. It is then seen as irregular large bright spots of light, finely structured moving light grains ('light nebula') and stationary bright stars. Regular geometrical patterns appear only when both eyes are indented simultaneously [1]. When the eyeball deformation is released, part of the retina again lights up for another one or two seconds and curved light lines are seen following the course of the larger retinal vessels (Fig. 1). In the following we will review the history of this phenomenon, which played an important role during the first 2200 years of vision theories and in the development of models to explain normal vision. 2. Pre-Socratic philosophers, Plato and Aristotle Alcmaeon of Croton (6-5th century B. C. ), who was a member of the Pythagoraean sect and one of the founders of Greek medicine, was the first to describe mechanical deformation of the eyeball leading to light sensa tions. According to Aristotle's pupil Theophrast of Eresos, Alcmaeon report ed that 'the eye obviously has fire within,for when the eye is struckfireflashes out' [2, p. 88].
Author: National Library of Medicine (U.S.)
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 910
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Author:
Publisher:
ISBN:
Category : Dentistry
Languages : en
Pages : 952
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Author:
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 2716
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Book Description
Author: Frederick E. Hoxie
Publisher: Oxford University Press
ISBN: 0199858896
Category : History
Languages : en
Pages : 665
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Book Description
The Oxford Handbook of American Indian History presents the story of the indigenous peoples who lived-and live-in the territory that became the United States. It describes the major aspects of the historical change that occurred over the past 500 years with essays by leading experts, both Native and non-Native, that focus on significant moments of upheaval and change.
Author: Sir Norman Lockyer
Publisher:
ISBN:
Category : Electronic journals
Languages : en
Pages : 1352
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 894
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Book Description
Author: United States. Surgeon General's Advisory Committee on Smoking and Health
Publisher:
ISBN:
Category : Smoking
Languages : en
Pages : 406
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Book Description
Author: Alison Bashford
Publisher: OUP USA
ISBN: 0195373146
Category : History
Languages : en
Pages : 607
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Book Description
Philippa Levine is the Mary Helen Thompson Centennial Professor in the Humanities at the University of Texas at Austin. Her books include Prostitution, Race and Politics: Policing Venereal Disease in the British Empire, and The British Empire, Sunrise to Sunset. --
