ABO/NAO 5 Revision Exam Questions With Verified Complete Solutions.
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Course
NAO
Institution
NAO
what is the average convergence distance in children - Answer 2mm instead of 3mm in adults
what is the refractive index of highlite lenses - Answer 1.70
chem-tempering makes a clear glass lens more impact resistant by placing the lens in a potassium nitrate bath. the lens undergoes a pr...
ABO/NAO 5 Revision Exam Questions
With Verified Complete Solutions.
what is the average convergence distance in children - Answer 2mm instead of 3mm in adults
what is the refractive index of highlite lenses - Answer 1.70
chem-tempering makes a clear glass lens more impact resistant by placing the lens in a potassium nitrate
bath. the lens undergoes a process known as what? - Answer ion exchange
what is the formula for the index of refraction - Answer index of refraction=velocity of light in air over
velocity of light in other media
what is polyamide - Answer a nylon-based material that is very strong. it can be made thinner and is
lighter than cellulose acetate. can be made translucent, is resistant to chemicals and solvents and is
hypoallergenic
when fitting a patient with progressive addition lenses for optimum performance, what is the vertex and
pantoscopic tilt, and is face form required? - Answer the frame should have sufficient face form, a short
vertex distance as long as the eyelashes do not touch the lens and should be adjustable for pantoscopic
angle of 10 to 12 degrees
a person with a short nose may benefit cosmetically from what ridge design - Answer keyhole or open-
bridged frame because it rest on the sides not on the crest of the bridge
which part distributes the weight of the frame over the nose pad area and the crest of the nose - Answer
strap bridge
the angle of incidence, for which the angle of refraction is 90 degrees is called the : - Answer critical
angle
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