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NAO VOLUME 4 QUESTIONS AND ANSWERS WITH VERIFIED SOLUTIONS!
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NAO VOLUME 4 QUESTIONS AND ANSWERS WITH VERIFIED SOLUTIONS!
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NAO VOLUME 4 QUESTIONS AND ANSWERSWITH VERIFIED SOLUTIONS!
The amount of reflection of each surface of CR-39 plastic lenses is approximately: -
ANSWER 4%
The absorption of light in lenses is classified by two variables. What are they? -
ANSWER Tint and lens transmission
The denser the tint in a lens, the _____: - ANSWER Less transmission of light
through the lens
Standard transmission in sunlenses should range between: - ANSWER 15% and
30%
If a person has exposure to sunlight at least 2 hours or more during the day, their
_____ - ANSWER Ability to adapt to night vision is compromised if they don't
protect their eyes from the sun exposure
A characteristic of a dark tinted glass lens with an RX of +4.00D sphere would
b_____ - ANSWER Dark in the center and lighter on the edge
Given a high plus or minus RX, which lens material would offer the best choice for
uniform density in a sunlens? - ANSWER cr-39 plastic and trivex
Although this may be the most popular color for sunlenses, it is not recommended
for patients with emerging cataracts: - ANSWER gray
, _____ added to any color increases contrast: - ANSWER yellow
_____ is better than _____ for improving contrast: - ANSWER green
Glare is of more concern to which wearer? - ANSWER cataract patient
_____ are generally inorganic materials (metals or minerals) that are vacuum
deposited to add color on glass lenses to give a uniform density of color on the
lenses: - ANSWER vacuum color coatings
Which company introduced CR-39 plastic lenses? - ANSWER PPG Industries
What is the index of refraction of polycarbonate? - ANSWER 1.59
The quality of today's polycarbonate lenses has been improved due to the
demand of what product? - ANSWER compact discs
Birefringence is also referred to as _____ and can result in distortion reducing the
visual performance to the wearer? - ANSWER double refraction
What is the index of refraction of trivex? - ANSWER 1.53
Features and benefits of trivex include_____: - ANSWER superior optics,
impact resistance, ultra-light weight (all of the above)
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