Volltext: Photography of the fundus of the human eye (20)

Physiology. — “Photography of the fundus of the human eye”. By 
Prof. I. K. A. Wertheim Salomonson. 
(Communicated in the meeting of April 27, 1917). 
Since the discovery of the ophthalmoscope by Helmholtz, dis¬ 
closing the interior of the living human eye, many different attempts 
have been made to keep a permanent record of the aspect of the 
retina on a photographic plate. This proved to be much more difficult 
than viewing the background of the eye. The greatest difficulty was 
caused by the reflexes given off on the surface of the cornea and 
the anterior and posterior surface of the lens. Different ways have 
been tried to get rid of these reflexes and after more or less suc¬ 
cessful attempts by Bagnéris, Guilloz, Gerloff and others, Dimmer 
succeeded in obtaining satisfactory results. Shortly afterwards Thorner 
and also Wolff, working on different lines, showed photographs of 
the living human retina which were nearly as good as those of 
Dimmer. His photographs are generally excellent. 
Of the eyes of animals Nicolaew was also successful in obtaining 
good negatives. But his method did not yield satisfactory results 
with the human eye, the fundus of which is infinitely more difficult 
to photograph than the animal fundus. 
For practical purposes as yet only Dimmer’s and perhaps Wolff’s 
method have to be considered. But Dimmer’s method necessitates a 
costly instrumentarium, requiring- much room and skilled assistance 
I do not know of its being used outside his own clinic, except by 
a very few specialists (e. g. Hess.). 
The different methods for obtaining a reflexless image of the 
fundus have been ably discussed by Gullstrand, who gave a cleai 
and critical review of the general and special conditions necessary 
for getting clearly defined ophthalmoscopic images, free from any 
reflex. Finally his results were embodied in his large demonstration 
ophthalmoscope, constructed by Zeiss, which shows the ophthalmos 
copie appearance of the human eye with less difficulty, more exten 
sively with a higher magnification and yet more clearly than any 
other instrument of the same kind. As yet this instrument canno 
be used for photographic purposes. But it seemed to me that i


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