Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Better Eyesight: The Complete Magazines of William H. Bates

I am amazed by how much this book has helped me. Bates' principles really do work! I have only been reading the book for about a month, yet my eyesight is improving. I can't wait until my next eye appointment so I can surprise my ophthamologist (who gave me stronger glasses at my last eye exam -- they are now too strong for me to wear!).