ABO Advanced Questions With Solutions guaranteed to Pass GRADED A+
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ABO Advanced
Institution
ABO Advanced
ABO Advanced Questions With Solutions guaranteed to Pass GRADED A+
The amount of reflection of each surface of CR-39 lenses is approximately - ANS 4%
The absorption of light in lenses is classified by two variables. What are they?
A. base curve and thickness
B. index of refraction and th...
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,The amount of reflection of each surface of CR-39 lenses is approximately - ANS 4%
The absorption of light in lenses is classified by two variables. What are they?
A. base curve and thickness
B. index of refraction and thickness
C. thickness and lens transmission
D. tint and lens transmission - ANS D. tint and lens transmission
A
The denser the tint in a lens
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A. the greater the transmission of light through the lens
B. the greater internal reflections in the lens
C. the less transmission of light through the lens
TU
D. the fewer internal reflections in the lens - ANS C. the less transmission of light
through the lens
Standard transmissions in sunlenses should range between - ANS 15% and 30%
IS
If a person has exposure to sunlight at least 2 hours or more during the day, - ANS
their ability to adapt to night vision is compromised if they don't protect their eyes from
the sun exposure
M
A characteristic of dark tinted glass lens with an Rx of +4.00D sphere would be - ANS
O
dark in the center and lighter on the edge
Given a high plus or high minus Rx, which lens material would offer the best choice for
A
uniform density in a sunlens?
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A. Pigmented glass
B. CR-39
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C. Trivex
D. B & C - ANS D. B & C
Although this may be the most popular color for sunlenses, it is not recommended for
patients with emerging cataracts - ANS Gray
_ added to any color increases contrast - ANS Yellow
_ is better than _ for improving contrast.
,A. Violet/Gray
B. Green/Gray
C. Gray/Green
D. Gray/Violet - ANS B. Green/Gray
Glare is of more concern to which wearer?
A. Red haired patient
A
B. Computer user
C. Cataract patient
VI
D. Presbyope - ANS C. Cataract patient
_ are generally inorganic materials (metals or minerals) that are vacuum deposited to
TU
add color on glass lenses to give a uniform density of color on the lenses - ANS
Vacuum color coatings
What company introduced CR-39 lenses? - ANS PPG Industries
IS
What is the index of refraction of polycarbonate? - ANS 1.586 or 1.59
The quality of today's polycarbonate lenses has been improved due to the demand of
M
what product? - ANS Compact discs
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Birefringence is also referred to as _ and can result in distortion reducing the visual
performance to the wearer? - ANS Double refraction
A
What is the index of refraction of Trivex? - ANS 1.53
N
Features and benefits of Trivex include _
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A. Superior optics
B. Impact resistance
C. Ultra-light weight
D. All of the above - ANS D. All of the above
Visible glare can be dangerous, because it can not only wash out colors, but in some
instances can cause - ANS photokeratitis
, Polarized filters are made by stretching thin sheets of _ in one meridian - ANS
polyvinyl alcohol
Two methods for orienting the polarized filters into lenses include - ANS laminating
and molded
As light reaches a polarizing filter, - ANS light in only one plane will pass through,
having the other absorbed by the filter, thereby reducing glare
A
Polarized lenses were may not be recommended for which visual task? - ANS Any
visual task that may include using LCD instrumentation
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Photochromic lenses were introduced by - ANS corning in 1964
TU
The color change in photochromic lenses occurs as a result of _ that are added to the
molten glass - ANS silver halide crystals
The first successful plastic photochromic lenses were introduced by - ANS transitions
in 1991
IS
Imbibed technology means - ANS that the photochromic technology is on the surface
of the lenses, which makes the color density not uniform throughout the lens
M
Corning's SunSensors utilizes - ANS in-mass technology, which means that the
O
photochromic crystals are in the matrix of the material which distributes photochromic
molecules throughout the lens, allowing a consistent and effective light response for the
life of the lens
A
Factors influencing darkening/lightening of photochromic lenses include
N
A. Intensity of light
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B. Temperature
C. Age of lens
D. All of the above - ANS D. All of the above
UV filtering properties are inherent in which lens?
A. CR-39
B. Polycarbonate
C. Trivex
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