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The questions about vision continue to come my way: [log in to unmask] (Nancy S. Shlaes) has intractable double vision at times not helped by "strong prism." First, I hope you are not trying to correct with bifocals, but are wearing separate distance and near glasses. Second, if you are holding the book very near, you need even stronger prism and even stronger correction for near. How about holding it a little farther away. Third, at those times when the double is impossible to fuse, try a piece of scotch-tape on the inside of the left eyeglass lens. You'll see single, for sure, and it will be surprisingly comfortable. Finally, if you blink several times, the "double" due to dry eyes will also resolve. Jacqueline Winterkorn, PhD, MD