2020–2021 BCSC Basic and Clinical Science Course™
3 Clinical Optics
Introduction: Quick-Start Guide to Optics and How to Refract
Part 1: Introductory Optics
If 2 (thin) lenses—say, of powers P1 and P2—are placed in contact immediately adjacent to one another, and we consider them together as a single compound lens system, the power of the 2 lenses taken together is given, to an excellent approximation, by the sum of the powers of the constituent lenses: P = P1 + P2. This summation is the utility of the reciprocal description of lens power.
Excerpted from BCSC 2020-2021 series : Section 3 - Clinical Optics. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.