On a visible stellation of the normal and of the cataractous crystalline lens of the human eye / by John Tweedy.

  • Tweedy, John, 1849-1924.
Date:
[1874]
Catalogue details

Licence: Public Domain Mark

Credit: On a visible stellation of the normal and of the cataractous crystalline lens of the human eye / by John Tweedy. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    Fig. 2. Before proceeding further in the consideration of the rela- tion which the rays of the stella hear to the nutrition of the lens and of their influence on vision, I must in justice to others and to myself refer to a question which has been raised as to my claim to have been the first to describe these rays as objectively seen in the living eye. At the time that I published my first article on this subject I had reason to believe, from the assurances of some of the most eminent anatomists and ophthalmic surgeons in London, whose names I need not here mention, that a visible striation of the living- normal crystalline lens had never before been described. But within two days of the appearance of my article I found, in reading the chapter on Entoptics in Professor Donders’ work, what I believed to be a confutation of my priority; for, after describing certain entoptic appearances of his own crystalline lens, Donders says, “ These phenomena are connected with the composition of the lens of the so-called sectors, which, as Helmholtz showed, can be very well seen with the ma°- b 2