Geometric Optics

Geometric Optics is an interactive book, intended for students and trainees in optometry, ophthalmology, and opticianry. The 250 pages cover: Prisms; Vergence and the Geometric Behavior of Light; Thin Lenses; Spherical and Plane Refracting Surfaces; Thick Lenses; The Correction of Refractive Error and Model Eyes; Reflection and Mirrors; Magnification and Telescopes; Apertures, Stops, and Field of View; and Astigmatism.
The book contains over 80 instructional videos and animations, 300 color photographs and figures, and 90 worked examples.
All figures and videos can be expanded to full screen with a tap or pinch-out gesture. 
The text contains automatic links to over 170 glossary terms, automatically assembled into a set of study cards or flash cards. Text can be highlighted and annotated to create custom notes. These are automatically added to your study cards. 
Different individuals use different symbols for the material covered in this book. For one of the most important equations, some like to use V = U + P while others prefer L′ = L + F.  
This book contains two versions of the same material. The version is shown on the bottom of every page:  
The first ten chapters use V = U + P  
The last ten chapters use L′ = L + F