Nancy Shlaes wrote in part: I may be foolish, but I have felt fortunate that I have the kind of PD with little tremor, but I do have a terrible reading problem--or rather a vision problem. I have been to an opthamologist who specializes in neurological problems and The prism helps but our eye doctor suggested an eye patch when the double vision seets in. She said to move from one eye to the other. However, we have taken to using the books on tape. Ted is really enjoying them and it rests his eyes. Our library has them and we joined one tape book club in the mail. Virginia Christiansen White Plains, NY [log in to unmask]