title: Optical principles of endoscopy.
abstract: Those optical characteristics which are of importance in the evaluation and comparison of endoscopes are, in general, easily observed and evaluated. An understanding of these characteristics and the means by which they are observed and measured is of benefit to beginning as well as experienced endoscopists. These factors will be defined and methods of observing, measuring and comparing them described.
mesh_terms: D019723:Endoscopes; D008027:Light; D055095:Optics and Photonics; D010781:Photography