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NAO Volume 4 Complete Questions And Answers With Latest Updates
Preview 3 out of 18 pages
NAO Volume 4 Complete Questions And Answers With Latest Updates What type of device is considered the earliest type of vision aid for reading? ANS A fluid filled Vessel What type of eyeglasses had short, stiff sidepieces ending in a circular ring that pressed against the temples of the head just above the ears ANS Temple Spectacles Which frame style used a "C" spring bridge to hold the eyewear in place? ANS Pince-Nez In what year did machine manufacturing of eyeglass frames occur? ANS 1830 What plastic replaced cellulose nitrate for the making of eyeglass frames? ANS Cellulose Acetate
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