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NAO (Physics) COURSE II STUDY GUIDE QUESTIONS AND ANSWERS RATED A.
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NAO (Physics) COURSE II STUDY GUIDE QUESTIONS AND ANSWERS RATED A.
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NAO (Physics) COURSE II STUDY GUIDEQUESTIONS AND ANSWERS RATED A.
what do you look for when you are trying to determine which lens material
would be the thinnest?
✔✔highest index of refraction
how are glass lenses hardened?
✔✔heat treatment
since fabricating laboratory take full responsibility for the accuracy of safety
and sports eyewear, verification of lens thickness by the dispenser is
unnecessary. T or F?
✔✔False
what does the FDA regulate for opticianry and when did they start doing it
✔✔impact resistance in 1971
what glass lenses are exempt from the drop ball test?
✔✔slab-off, cataract, custom laminate lenses
T or F? 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.
✔✔false
,sagittal depth is the straight line distance between the back surface of a
lens at its vault and the chord diameter of the lens. T of F?
✔✔True
If the deviation is a negative number is it exiting of entering the medium?
✔✔exiting
If the devation is a positive number is it exiting of entering the medium?
✔✔entering
what type of lens would produce with motion?
✔✔minus
what lens would produce against motion?
✔✔plus
plus cylinder lenses have the cylinder generated on the...
✔✔front surface
minus cylinder lenses have the cylinder generated on the...
✔✔back surface
presbyopia
✔✔inability to see near objects clearly and comfortably
, what is the earliest form of presbyopic lens correction?
✔✔single visions lenses
which glass bifocal lens desogn was the first to use a fusing process?
✔✔The kryptok
when was the first trifocal lens developed?
✔✔1936
what is the furthest and closest a person will be able to see if he is looking
through a plano distance add multifocal and has a 4.00D of accommodative
amplitude?
✔✔40cm to 15.4cm
the blended region between the distance and near zones of a progressive
addition lens is known as the ... zone.
✔✔intermediate
when a lens has its surface astigmatism concentrated into smaller areas of
the lens, it is classified as..... design.
✔✔hard
which progressive lens design classification do most manufactures use?
✔✔a combination of hard and soft
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