NAO Volume II – Questions With Indepth Solutions
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Practice questions for this set
Learn 1 /7 Study using Learn
Carbon fiber
Choose an answer
Because this material is black in its
original form this plastic must apply
1 ED 2
color through the use of baked-on
enameling.
What plastic frame material is the only
3 one that can be either pantographed 4 GC
or injection molded?
Don't know?
Terms in this set (44)
ED Effective diameter. Twice the longest radius. Used to
determine the smallest lens blank that needs to be
cut.
, B The vertical box dimension or the vertical distance
between two horizontal tangents to the vertical
extremities of the lens shape.
DBL Distance between lenses
DBC Distance between centers. See GC. Frame PD
GC The geometric center of the box, eyewire, or lens
shape
OC Optical center. Point of not prism
Why did the FDA ban cellulose nitrate It was too flammable to be considered safe
as a frame material?
When were lenses first set in frames? Late in the 13th century
Who were the first spectacle makers? Goldsmiths
Which of the following frame materials Stainless steal
was not used until the 20th century?
Why is plastic a popular material for It can easily be molded and shaped.
spectacle frames?
What special care is required for nylon Periodic soaking in water overnight
frames?
What plastic frame material is the only Cellulose acetate
one that can be either pantographed
or injection molded?
Which of the following plastics will Polymide
shrink if over-heated?
Save Groups
Practice questions for this set
Learn 1 /7 Study using Learn
Carbon fiber
Choose an answer
Because this material is black in its
original form this plastic must apply
1 ED 2
color through the use of baked-on
enameling.
What plastic frame material is the only
3 one that can be either pantographed 4 GC
or injection molded?
Don't know?
Terms in this set (44)
ED Effective diameter. Twice the longest radius. Used to
determine the smallest lens blank that needs to be
cut.
, B The vertical box dimension or the vertical distance
between two horizontal tangents to the vertical
extremities of the lens shape.
DBL Distance between lenses
DBC Distance between centers. See GC. Frame PD
GC The geometric center of the box, eyewire, or lens
shape
OC Optical center. Point of not prism
Why did the FDA ban cellulose nitrate It was too flammable to be considered safe
as a frame material?
When were lenses first set in frames? Late in the 13th century
Who were the first spectacle makers? Goldsmiths
Which of the following frame materials Stainless steal
was not used until the 20th century?
Why is plastic a popular material for It can easily be molded and shaped.
spectacle frames?
What special care is required for nylon Periodic soaking in water overnight
frames?
What plastic frame material is the only Cellulose acetate
one that can be either pantographed
or injection molded?
Which of the following plastics will Polymide
shrink if over-heated?
