NAO BOOK 2 EXAM QUESTIONS AND
ANSWERS ALL CORRECT
What is chromatic Aberration? - Answer- Color distortion due to the material when light
passes through it.
Polycarbonate is the softest spectacle lens material. - Answer- TRUE
How are glasses lenses hardened? - Answer- Heat treating is done in 2-3 minutes in a
small furnace and chemical treating is done by immersing is done by immersing lenses
in molten salt.
How long does the FDA require that you keep a patient's file? - Answer- 3 years
What does a product liability mean for opticians? - Answer- The product was not up to
accepted standards.
Since the fabricating laboratory takes full responsibility for the accuracy of safety and
sports eyewear, verification of lens thickness by the dispenser is unnecessary. -
Answer- FALSE
The FTC established eyeglasses I in 1978 and Eyeglass II in 1989. What's the
difference between them? - Answer- Eyeglass I is the prescription release rule and lists
minimum information to be included in the RX. Eyeglass II no longer lists the minimum
information needed to make spectacle RXs.
What does the FDA regulate for opticianry (excluding contact lenses) and when did they
start doing it? - Answer- Impact resistance in 1971
Both scratch resistant and AR coatings are harder than the plastic lens material they are
adhered to. - Answer- TRUE
The harder the material the more resistant it will be. - Answer- FALSE
Which of the following glass lenses is exempt from the drop ball test? - Answer- All of
the below:
Slab-off lenses
Cataract Lenses
Custom laminate lenses
, If 4 lenses were made with the exact same curves and thickness, which lens would be
the heaviest? - Answer- Crown glass
A lens for safety glasses must be 3.0mm thick if it is CR-39 or glass, but if it is
polycarbonate the thickness must be at least 2.0mm. - Answer- FALSE
Which type of temple curves around the ear following the crotch of the ear where ear
and head meet, extending to the level of the earlobe? - Answer- Riding bow
Which frame material can be made thin and lightweight, with frame colors that are
primarily opaque? Some problems may be encountered with breakage in cold weather.
- Answer- Carbon fiber
Which of the frame bridge of the nose smoothly, spreading the weight of the frame over
the nose and using nose pads attached to the back of the frame bridge? - Answer-
Modified saddle
A patient's bridge supports 50% of the weight of the frame. - Answer- FALSE
What are the parts of the frame that are the outer areas of the front of the front to the
right and left where the temples are attached? - Answer- End pieces
What is the name of the bridge that was originally made popular in the late 1800s and is
being brought back in several new retro styles? - Answer- metal saddle bridge
What is the "butt end" of a frame? - Answer- The end of the temple that touches against
(butts into) the frame front.
Which type of frame has two holes on each side of the each lens eye wire and a metal
reinforcing arm that follows the upper front surface of the lens? - Answer- Semi rimless
The name Zyl or Zylonite is a trade name for which plastic material? - Answer- cellulose
acetate
Which material is often used for temples because of its strength and flexibility? -
Answer- Stainless steel
When were lenses first set in frames? - Answer- late 13th century
Who were the first spectacle frame makers? - Answer- Goldsmiths
Which of the following frame materials was not used until the 20th century? - Answer-
Stainless steel
ANSWERS ALL CORRECT
What is chromatic Aberration? - Answer- Color distortion due to the material when light
passes through it.
Polycarbonate is the softest spectacle lens material. - Answer- TRUE
How are glasses lenses hardened? - Answer- Heat treating is done in 2-3 minutes in a
small furnace and chemical treating is done by immersing is done by immersing lenses
in molten salt.
How long does the FDA require that you keep a patient's file? - Answer- 3 years
What does a product liability mean for opticians? - Answer- The product was not up to
accepted standards.
Since the fabricating laboratory takes full responsibility for the accuracy of safety and
sports eyewear, verification of lens thickness by the dispenser is unnecessary. -
Answer- FALSE
The FTC established eyeglasses I in 1978 and Eyeglass II in 1989. What's the
difference between them? - Answer- Eyeglass I is the prescription release rule and lists
minimum information to be included in the RX. Eyeglass II no longer lists the minimum
information needed to make spectacle RXs.
What does the FDA regulate for opticianry (excluding contact lenses) and when did they
start doing it? - Answer- Impact resistance in 1971
Both scratch resistant and AR coatings are harder than the plastic lens material they are
adhered to. - Answer- TRUE
The harder the material the more resistant it will be. - Answer- FALSE
Which of the following glass lenses is exempt from the drop ball test? - Answer- All of
the below:
Slab-off lenses
Cataract Lenses
Custom laminate lenses
, If 4 lenses were made with the exact same curves and thickness, which lens would be
the heaviest? - Answer- Crown glass
A lens for safety glasses must be 3.0mm thick if it is CR-39 or glass, but if it is
polycarbonate the thickness must be at least 2.0mm. - Answer- FALSE
Which type of temple curves around the ear following the crotch of the ear where ear
and head meet, extending to the level of the earlobe? - Answer- Riding bow
Which frame material can be made thin and lightweight, with frame colors that are
primarily opaque? Some problems may be encountered with breakage in cold weather.
- Answer- Carbon fiber
Which of the frame bridge of the nose smoothly, spreading the weight of the frame over
the nose and using nose pads attached to the back of the frame bridge? - Answer-
Modified saddle
A patient's bridge supports 50% of the weight of the frame. - Answer- FALSE
What are the parts of the frame that are the outer areas of the front of the front to the
right and left where the temples are attached? - Answer- End pieces
What is the name of the bridge that was originally made popular in the late 1800s and is
being brought back in several new retro styles? - Answer- metal saddle bridge
What is the "butt end" of a frame? - Answer- The end of the temple that touches against
(butts into) the frame front.
Which type of frame has two holes on each side of the each lens eye wire and a metal
reinforcing arm that follows the upper front surface of the lens? - Answer- Semi rimless
The name Zyl or Zylonite is a trade name for which plastic material? - Answer- cellulose
acetate
Which material is often used for temples because of its strength and flexibility? -
Answer- Stainless steel
When were lenses first set in frames? - Answer- late 13th century
Who were the first spectacle frame makers? - Answer- Goldsmiths
Which of the following frame materials was not used until the 20th century? - Answer-
Stainless steel
