Defects of sight their nature, causes, prevention, and general management This book, "Defects of sight their nature, causes, prevention, and general management", by Thomas Wharton Jones, is a replication of a book originally published before 1856. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.