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To the Editor.
—I think Drs. Davis and Chandler are right as far as they go, but they say "one recent text" correctly identified these substances, without mentioning that I made it all very clear in my Toxicology of the Eye.Further, the authors should give attention to the article by Berman and Manabe (Ann Ophthalmol 5:1193, 1973) in which they give evidence that not only calcium but zinc is involved in the activity of some collagenases, and in this context, one might use either calcium or sodium EDTA.
Grant WM. Misconception About Chelation-Reply. Arch Ophthalmol. 1974;92(4):362. doi:10.1001/archopht.1974.01010010372029