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Arch Ophthalmol. 1999;117:249.

	Since this article does not have an abstract, we have provided the first 130 words of the full text and any section headings.

In comparatively numerous cases, we find on or upon the entrance of the optic nerve membranous or hypertrophic structures of a bluish-white color, which undoubtedly are not due to pathological changes. Up to the present time I have seen seven cases which presented this appearance: thus giving a proportion of about 1 to 1500 cases. If we consider the proportion of opaque nerve fibres on the optic nerve or in the retina as 1:600 (according to my journal), we see that, as regards frequency, the first-mentioned picture is not much rarer than the latter. It is, therefore, quite astonishing that the most commonly used text-books—excepting some foreign ones—make no mention whatever of the forms in question, whereas the so-called rabbit formation is quite extensively discussed.

Reference: Arch Ophthalmol. 1898;27:72.