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nao volume II Exam 100% Accurate!!

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ED - ANSWERSEffective diameter. Twice the longest radius. Used to determine the smallest lens blank that needs to be cut. B - ANSWERSThe vertical box dimension or the vertical distance between two horizontal tangents to the vertical extremities of the lens shape. DBL - ANSWERSDistance between...

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  • October 28, 2024
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  • Nao volume II
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nao volume II Exam 100% Accurate!!

ED - ANSWERSEffective diameter. Twice the longest radius. Used to determine the smallest lens blank
that needs to be cut.



B - ANSWERSThe vertical box dimension or the vertical distance between two horizontal tangents to the
vertical extremities of the lens shape.



DBL - ANSWERSDistance between lenses



DBC - ANSWERSDistance between centers. See GC. Frame PD



GC - ANSWERSThe geometric center of the box, eyewire, or lens shape



OC - ANSWERSOptical center. Point of not prism



Why did the FDA ban cellulose nitrate as a frame material? - ANSWERSIt was too flammable to be
considered safe



When were lenses first set in frames? - ANSWERSLate in the 13th century



Who were the first spectacle makers? - ANSWERSGoldsmiths



Which of the following frame materials was not used until the 20th century? - ANSWERSStainless steal



Why is plastic a popular material for spectacle frames? - ANSWERSIt can easily be molded and shaped.



What special care is required for nylon frames? - ANSWERSPeriodic soaking in water overnight

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