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To the Editor:
—I have been highly impressed by the important contribution we owe to Mr. Hobbs. I should try to explain why my interpretation of this study on the canal of Schlemm differs from his. During gonioscopy Mr. Hobbs saw blood enter the canal in all of 12 normal subjects (Brit. J. Ophth.34:492, 1950). Of 26 glaucomatous patients, definite appearance of blood occurred in 16 and appearances suggestive of blood in 5, and in 5 others no blood was seen (page 493). This result was achieved (a) by adding to the scleral surface of the posterior lip of the gonioprism a rim 0.75 mm. thick and 1.0 mm. broad, and (b) by maintenance of pressure for a few minutes until, in some eyes, minute streams of blood were seen to issue from the canal into the anterior chamber. A ring of edematous conjunctiva was seen on removing
Ascher KW. AQUEOUS VEINS. AMA Arch Ophthalmol. 1953;50(4):542. doi:10.1001/archopht.1953.00920030550019