This document applies to rigid endoscopes designed for use in the practice of medicine. Endoscopes 
having a fibre-optic or opto-electronic imaging system are excluded. It specifies a test method for 
determining the optical resolution of endoscopes.
This document provides a measurement method for characterizing three aspects of the optical 
resolution of a rigid endoscope. Characteristic A is used to provide a simple measurement of the limiting 
resolution of the endoscope image. Characteristic B provides a measurement of low spatial frequency 
resolution and characterizes the sharpness, or contrast, of the endoscope image. Characteristic C 
provides a measurement of the spatial frequency response of the endoscope image.nd edition 2020-10 Optics and photonics — Medical endoscopes and endotherapy devices — Part 5: Determination of optical resolution of rigid endoscopes with optics Optique et photonique — Endoscopes médicaux et dispositifs d'endothérapie — Partie 5: Détermination de la résolution optique des endoscopes optiques rigides Reference number ISO 8600-5:2020(E) ？ ISO 2020 ISO 8600-5:2020(E)