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September 1971


Author Affiliations

Albany, NY

Arch Ophthalmol. 1971;86(3):360. doi:10.1001/archopht.1971.01000010362021

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To the Editor.  —I have reviewed the letter of Dr. Kern and found his Rule of Fours intriguing. I took the time to plot the results which one would get from his calculations as against Duane's original table. You can see from the Figure that the two are almost identical, thus substantiating his rule.