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To the Editor:
—Enclosed is a drawing showing a rapid method of demonstrating the "ring scotoma" of cataract spectacle lenses. In a recent lecture I gave on the physiology of vision through cataract spectacle lenses, only three of seventy ophthalmologists present had ever investigated and demonstrated this blind ring scotoma area of the spectacle-corrected aphakic.
Welsh RC. "RING SCOTOMA". Arch Ophthalmol. 1963;70(1):139. doi:10.1001/archopht.1963.00960050141024