History of Ophthalmology
Sub auspiciis Academiae Ophthalmologicae Internationalis
Häftad, Engelska, 1990
Del 3 i serien History of Ophthalmology
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Beskrivning
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.