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  1. Dear Colleagues, Can anyone explain the difference between NOD and NWD as it defined in the DCS: NOD - (numeric;) Refracted object distance at near viewing point (meters). NWD - (numeric;) Working object distance at near viewing point (meters). We would like to use the one who fits most to describe the reading distance measured by the ECP. Thank you in advance for your support. Stay safe Haim S. - Shamir Optical Ind.