This early works on Prisms - There use and equivalent contains 118 Illustrations, to make the subject-matter more entertaining, the writer has not limited himself to the consideration of prisms in ophthalmic practice alone, and by omitting mathematic formulas and inserting many illustrations the text is made easy of comprehension...... Much of the information contained within is still useful and practical today. Many of the earliest books, particularly those dating back to the 1900's and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.