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NAO VOLUME IV: Questions And Verified Solutions (By Expert)
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NAO VOLUME IV: Questions And Verified Solutions (By Expert)
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NAO VOLUME IV: Questions And Verified Solutions (ByExpert)
The amount of reflection of each surface of CR-39 plastic lenses is
approximately: Right Ans - 4%
The absorption of light in lenses is classified by two variables. What are they?
Right Ans - Tint and lens transmission
The denser the tint in a lens, the _____: Right Ans - Less transmission of light
through the lens
Standard transmission in sunlenses should range between: Right Ans -
15% and 30%
If a person has exposure to sunlight at least 2 hours or more during the day,
their _____ Right Ans - 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_____ Right Ans - 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? Right Ans - cr-39 plastic and trivex
Although this may be the most popular color for sunlenses, it is not
recommended for patients with emerging cataracts: Right Ans - gray
_____ added to any color increases contrast: Right Ans - yellow
_____ is better than _____ for improving contrast: Right Ans - green
Glare is of more concern to which wearer? Right Ans - 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: Right Ans - vacuum color coatings
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