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ABO/NAO 5 EXAM QUESTIONS AND ANSWERS (100% CORRECT ANSWERS /ALREADY GRADED A+

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This comprehensive ABO/NAO exam preparation guide features real test questions with verified answers covering all essential opticianry topics: lens materials (Highlite, polyamide, flint glass), refractive index calculations, chem-tempering and ion exchange, progressive addition lens fitting (vertex distance, pantoscopic tilt, face form), frame bridge designs (keyhole, strap bridge), prism correction for esotropia, critical angle and total internal reflection, cataract spectacle lenses, astigmatism classification, vertex distance changes with base curve, drop ball test standards, and round segment vs. executive bifocals. Designed for opticians, optometry students, and ABO/NAO certification candidates, this resource includes critical angle principles, axial ray behavior, pantoscopic tilt calculations, and PAL fitting guidelines. Perfect for passing the American Board of Opticianry and National Academy of Opticianry certification exams.

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ABO/NAO 5 EXAM QUESTIONS AND
ANSWERS (100% CORRECT ANSWERS
/ALREADY GRADED A+


What is the average convergence distance in children - CORRECT ANSWER ✔✔-
2mm instead of 3mm in adults


What is the refractive index of highlite lenses - CORRECT 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? -
CORRECT ANSWER ✔✔- ion exchange


What is the formula for the index of refraction - CORRECT ANSWER ✔✔- index
of refraction=velocity of light in air over velocity of light in other media


What is polyamide - CORRECT 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? - CORRECT
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



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