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NAO VOLUME IV Exam Questions With
Verified Answers
The amount of reflection of each surface of CR-39 plastic lenses is approximately: -
Answers✔4%
The absorption of light in lenses is classified by two variables. What are they? - Answers✔Tint
and lens transmission
The denser the tint in a lens, the _____: - Answers✔Less transmission of light through the lens
Standard transmission in sunlenses should range between: - Answers✔15% and 30%
If a person has exposure to sunlight at least 2 hours or more during the day, their _____ -
Answers✔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_____ -
Answers✔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? - Answers✔cr-39 plastic and trivex
Although this may be the most popular color for sunlenses, it is not recommended for patients
with emerging cataracts: - Answers✔gray
_____ added to any color increases contrast: - Answers✔yellow
_____ is better than _____ for improving contrast: - Answers✔green
Glare is of more concern to which wearer? - Answers✔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: - Answers✔vacuum color
coatings
Which company introduced CR-39 plastic lenses? - Answers✔PPG Industries
1
ALL RIGHTS RESERVED.
NAO VOLUME IV Exam Questions With
Verified Answers
The amount of reflection of each surface of CR-39 plastic lenses is approximately: -
Answers✔4%
The absorption of light in lenses is classified by two variables. What are they? - Answers✔Tint
and lens transmission
The denser the tint in a lens, the _____: - Answers✔Less transmission of light through the lens
Standard transmission in sunlenses should range between: - Answers✔15% and 30%
If a person has exposure to sunlight at least 2 hours or more during the day, their _____ -
Answers✔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_____ -
Answers✔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? - Answers✔cr-39 plastic and trivex
Although this may be the most popular color for sunlenses, it is not recommended for patients
with emerging cataracts: - Answers✔gray
_____ added to any color increases contrast: - Answers✔yellow
_____ is better than _____ for improving contrast: - Answers✔green
Glare is of more concern to which wearer? - Answers✔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: - Answers✔vacuum color
coatings
Which company introduced CR-39 plastic lenses? - Answers✔PPG Industries
1
