This book is intended to provide the opticians with all information to help demonstrate to their clients and patients and also a reference guide to students of optometry. The book is written in a very simple language. TABLE OF CONTENTS: 1. Light, 2. Lenses, 3. Prism, 4. Transposition, 5. The Prescription, 6. Selection of Lenses, 7. Frames and Measurements, 8. Lens Grinding, 9. Verification of Spectacles, 10. Dispensing Spectacles to Children, 11. Contact Lenses, 12. Eyes, 13. Troubleshooting: A Fast Reference Guide, 14. Some Useful Terms.