Dr. Henry H. Tyson published in the Archives of Ophthalmology1 the report of a case of lenticonus posterior. He pointed out that the abnormality was of extreme rarity, only six of the hitherto published examples having stood the test of slit-lamp examination. Fuchs, in his textbook, stated that lenticonus posterior is not so uncommon as lenticonus anterior, but he had seen only three cases.
The condition cannot be so rare as is supposed. Miss Mann said that she had seen three cases in London. Mr. P. J. Hay informed me that three or four examples had been shown to the Northern Ophthalmological Society of England, of which he is secretary.
The number of published cases of any abnormality is no criterion of the actual incidence of this condition. The majority of ophthalmologists do not publish their interesting cases, and not all have the necessary knowledge to differentiate
BUTLER TH. LENTICONUS POSTERIOR: REPORT OF SIX CASES. Arch Ophthalmol. 1930;3(4):425–436. doi:https://doi.org/10.1001/archopht.1930.00810060043007
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