Nomographs for the Optical Properties of Simple Magnifiers
ALAN W. JOHNSTON · Clinical and Experimental Optometry · 1983
A general solution for equivalent power Fc magnification Mg and linear field of view W for the simple magnifier is presented in the form of two nomographs. The nomographs are useful in demonstrating graphically how a variation in a ‘user’ parameter for a simple magnifier, such as object distance, image vergence, accommodation or spectacle near addition, or eye‐to‐magnifier separation can change the equivalent power and theoretical field of view of the eye‐magnifier system.