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ABO/NAO 5: Questions & Detailed Solutions (Rated A+)
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ABO/NAO 5: Questions & Detailed Solutions (Rated A+)
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ABO/NAO 5: Questions & Detailed Solutions (Rated A+)What is the average convergence distance in children Right Ans - 2mm
instead of 3mm in adults
What is the refractive index of highlite lenses Right Ans - 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?
Right Ans - ion exchange
What is the formula for the index of refraction Right Ans - index of
refraction=velocity of light in air over velocity of light in other media
What is polyamide Right Ans - 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? Right Ans - 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
Right Ans - 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 Right Ans - strap bridge
The angle of incidence, for which the angle of refraction is 90 degrees is called
the : Right Ans - critical angle
What is the most commonly used prescription for correcting esotropia caused
by muscle imbalance Right Ans - base out prism/ one eye turns
inward(sometimes both) a prism displaces an image towards its apex
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