Each of my last three sets of glassses (acquired at 2-year intervals) seems\nto cause slightly more intense ghost images than the last. It's especially\nannoying when I try to read in the evening and one line of text is ghosted\nonto the next.\n\nWhat causes the ghosting effect, and what can I do to minimize it? Would\nthis require going to a lower-index lens material? I'm currently using\nhigh-index (1.66?) lenses with a correction of -11.5 spherical, 2 or 3\ncylindrical at 29 (one eye) and 160 (other eye).