Positive Vision: Enjoying the Adventures and Advantages of Poor Eyesight is for sale at major book stores worldwide as a hardcover, paperback, and ebook (all formats). The audio book (all formats) is being narrated, so will be available in a little while.
If you live near a book store, please support them and your local community by ordering the book there.
Adlibris (Sweden) hardcover paperback
Agapea (Spain) hardcover
Barnes & Noble (United States) hardcover paperback ebook
Book Depository (worldwide) hardcover paperback
Fabled Bookshop & Café (United States) hardcover and paperback
Fishpond (worldwide) hardcover and paperback
Vision Australia (Australia) paperback
Waterstones (United Kingdom) hardcover
Wook (Portugal) hardcover paperback ebook
If you know of other places where Positive Vision is for sale, please let me know via the Contact form.