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To the Editor.—In reference to an abstract in the Archives of Ophthalmology, page 911, December, 1932, of an article entitled, "Progressive Myopia: A Suggestion Explaining Its Causation, and for Its Treatment," by J. P. S. Walker, British Journal of Ophthalmology, page 485, August, 1932, I wish to state that since 1930 I have been using vitamin D in the form of viosterol and calcium in the form of milk in all cases of progressive myopia and keratoconus with most encouraging results. So far I have published no paper because I have not followed the patients a sufficient length of time.