ABO/NAO 5 Exam Questions With Verified
Answers
What is the average convergence distance in children - answer2mm instead of 3mm in adults
what is the refractive index of highlite lenses - answer1.70
chem-tempering makes a clear glass lens more impact resistant by placing the lens in a
potassium...
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
what is the most commonly used prescription for correcting esotropia caused by muscle
imbalance - answer✔base out prism/ one eye turns inward(sometimes both) a prism displaces
an image towards its apex
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