Defective Eyesight: The Principles Of Its Relief By Glasses is a book written by Daniel Bennett St. John Roosa in 1899. The book is a comprehensive guide on the principles of correcting eyesight problems through the use of glasses. Roosa, who was an ophthalmologist, provides detailed explanations of the anatomy of the eye, the causes of vision problems, and the various types of lenses and glasses that can be used to correct them. The book also includes...