Exam (elaborations)
NAO VOLUME 2 QUESTIONS AND ANSWERS WITH VERIFIED SOLUTIONS 100% CORRECT | LATEST UPDATE 2025
- Course
- Institution
NAO VOLUME 2 QUESTIONS AND ANSWERS WITH VERIFIED SOLUTIONS 100% CORRECT | LATEST UPDATE 2025
[Show more]
Content preview
NAO VOLUME 2 QUESTIONS AND ANSWERSWITH VERIFIED SOLUTIONS 100% CORRECT |
LATEST UPDATE 2025
ED - ANSWER Effective diameter. Twice the longest radius. Used to determine
the smallest lens blank that needs to be cut.
B - ANSWER The vertical box dimension or the vertical distance between two
horizontal tangents to the vertical extremities of the lens shape.
DBL - ANSWER Distance between lenses
DBC - ANSWER Distance between centers. See GC. Frame PD
GC - ANSWER The geometric center of the box, eyewire, or lens shape
OC - ANSWER Optical center. Point of not prism
Why did the FDA ban cellulose nitrate as a frame material? - ANSWER It was
too flammable to be considered safe
When were lenses first set in frames? - ANSWER Late in the 13th century
Who were the first spectacle makers? - ANSWER Goldsmiths
, Which of the following frame materials was not used until the 20th century? -
ANSWER Stainless steal
Why is plastic a popular material for spectacle frames? - ANSWER It can easily
be molded and shaped.
What special care is required for nylon frames? - ANSWER Periodic soaking in
water overnight
What plastic frame material is the only one that can be either pantographed or
injection molded? - ANSWER Cellulose acetate
Which of the following plastics will shrink if over-heated? - ANSWER Polymide
Because this material is black in its original form this plastic must apply color
through the use of baked-on enameling. - ANSWER Carbon fiber
What materials are adjustments the most difficult to achieve due to its tendency
to relax? - ANSWER Kevlar
Which of the following materials recommends "cold snap" lens insertion? -
ANSWER Polymide
Because of its tendency to dry out, the manufacturers of this frame material
recommend that the wearer periodically soak their frames in water over night. -
ANSWER Nylon
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller StudySet. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75759 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now