NAO VOLUME IV EXAM 2025 WITH 100%
ACCURATE 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
ACCURATE 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
