ABO ADVANCE QUESTIONS AND
ANSWERS >> 2024 VERSION 100%
ACCURATE
The amount of reflection of each surface of CR-39 lenses is approximately - 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 - D. tint and lens transmission
The denser the tint in a lens
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
D. the fewer internal reflections in the lens - C. the less transmission of light through the
lens
Standard transmissions in sunlenses should range between - 15% and 30%
If a person has exposure to sunlight at least 2 hours or more during the day, - their
ability to adapt to night vision is compromised if they don't protect their eyes from the
sun exposure
A characteristic of dark tinted glass lens with an Rx of +4.00D sphere would be - 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
uniform density in a sunlens?
A. Pigmented glass
B. CR-39
C. Trivex
D. B & C - D. B & C
Although this may be the most popular color for sunlenses, it is not recommended for
patients with emerging cataracts - Gray
,_ added to any color increases contrast - Yellow
_ is better than _ for improving contrast.
A. Violet/Gray
B. Green/Gray
C. Gray/Green
D. Gray/Violet - B. Green/Gray
Glare is of more concern to which wearer?
A. Red haired patient
B. Computer user
C. Cataract patient
D. Presbyope - C. 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 - Vacuum
color coatings
What company introduced CR-39 lenses? - PPG Industries
What is the index of refraction of polycarbonate? - 1.586 or 1.59
The quality of today's polycarbonate lenses has been improved due to the demand of
what product? - Compact discs
Birefringence is also referred to as _ and can result in distortion reducing the visual
performance to the wearer? - Double refraction
What is the index of refraction of Trivex? - 1.53
Features and benefits of Trivex include _
A. Superior optics
B. Impact resistance
C. Ultra-light weight
D. All of the above - D. All of the above
Visible glare can be dangerous, because it can not only wash out colors, but in some
instances can cause - photokeratitis
Polarized filters are made by stretching thin sheets of _ in one meridian - polyvinyl
alcohol
, Two methods for orienting the polarized filters into lenses include - laminating and
molded
As light reaches a polarizing filter, - light in only one plane will pass through, having the
other absorbed by the filter, thereby reducing glare
Polarized lenses were may not be recommended for which visual task? - Any visual
task that may include using LCD instrumentation
Photochromic lenses were introduced by - corning in 1964
The bcolor bchange bin bphotochromic blenses boccurs bas ba bresult bof b_ bthat bare badded bto bthe
bmolten bglass b- b bsilver bhalide bcrystals
The bfirst bsuccessful bplastic bphotochromic blenses bwere bintroduced bby b- b btransitions bin
b1991
Imbibed btechnology bmeans b- b bthat bthe bphotochromic btechnology bis bon bthe bsurface bof
bthe blenses, bwhich bmakes bthe bcolor bdensity bnot buniform bthroughout bthe blens
Corning's bSunSensors butilizes b- b bin-mass btechnology, bwhich bmeans bthat bthe
bphotochromic bcrystals bare bin bthe bmatrix bof bthe bmaterial bwhich bdistributes bphotochromic
bmolecules bthroughout bthe blens, ballowing ba bconsistent band beffective blight bresponse bfor
bthe blife bof bthe blens
Factors binfluencing bdarkening/lightening bof bphotochromic blenses binclude
A. bIntensity bof blight
B. bTemperature
C. bAge bof blens
D. bAll bof bthe babove b- b bD. bAll bof bthe babove
UV bfiltering bproperties bare binherent bin bwhich blens?
A. bCR-39
B. bPolycarbonate
C. bTrivex
D. bB b& bC b- b bD. bB b& bC
How bmuch bUV bis babsorbed bby ba bclear bcrown bglass blens? b- b b9%
How bmuch bUV bis babsorbed bby ba bgray b#3 bcrown bglass blens? b- b b82%
How bmuch bUV bis babsorbed bby ba bclear bCR-39 blens? b- b b55%
ANSWERS >> 2024 VERSION 100%
ACCURATE
The amount of reflection of each surface of CR-39 lenses is approximately - 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 - D. tint and lens transmission
The denser the tint in a lens
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
D. the fewer internal reflections in the lens - C. the less transmission of light through the
lens
Standard transmissions in sunlenses should range between - 15% and 30%
If a person has exposure to sunlight at least 2 hours or more during the day, - their
ability to adapt to night vision is compromised if they don't protect their eyes from the
sun exposure
A characteristic of dark tinted glass lens with an Rx of +4.00D sphere would be - 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
uniform density in a sunlens?
A. Pigmented glass
B. CR-39
C. Trivex
D. B & C - D. B & C
Although this may be the most popular color for sunlenses, it is not recommended for
patients with emerging cataracts - Gray
,_ added to any color increases contrast - Yellow
_ is better than _ for improving contrast.
A. Violet/Gray
B. Green/Gray
C. Gray/Green
D. Gray/Violet - B. Green/Gray
Glare is of more concern to which wearer?
A. Red haired patient
B. Computer user
C. Cataract patient
D. Presbyope - C. 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 - Vacuum
color coatings
What company introduced CR-39 lenses? - PPG Industries
What is the index of refraction of polycarbonate? - 1.586 or 1.59
The quality of today's polycarbonate lenses has been improved due to the demand of
what product? - Compact discs
Birefringence is also referred to as _ and can result in distortion reducing the visual
performance to the wearer? - Double refraction
What is the index of refraction of Trivex? - 1.53
Features and benefits of Trivex include _
A. Superior optics
B. Impact resistance
C. Ultra-light weight
D. All of the above - D. All of the above
Visible glare can be dangerous, because it can not only wash out colors, but in some
instances can cause - photokeratitis
Polarized filters are made by stretching thin sheets of _ in one meridian - polyvinyl
alcohol
, Two methods for orienting the polarized filters into lenses include - laminating and
molded
As light reaches a polarizing filter, - light in only one plane will pass through, having the
other absorbed by the filter, thereby reducing glare
Polarized lenses were may not be recommended for which visual task? - Any visual
task that may include using LCD instrumentation
Photochromic lenses were introduced by - corning in 1964
The bcolor bchange bin bphotochromic blenses boccurs bas ba bresult bof b_ bthat bare badded bto bthe
bmolten bglass b- b bsilver bhalide bcrystals
The bfirst bsuccessful bplastic bphotochromic blenses bwere bintroduced bby b- b btransitions bin
b1991
Imbibed btechnology bmeans b- b bthat bthe bphotochromic btechnology bis bon bthe bsurface bof
bthe blenses, bwhich bmakes bthe bcolor bdensity bnot buniform bthroughout bthe blens
Corning's bSunSensors butilizes b- b bin-mass btechnology, bwhich bmeans bthat bthe
bphotochromic bcrystals bare bin bthe bmatrix bof bthe bmaterial bwhich bdistributes bphotochromic
bmolecules bthroughout bthe blens, ballowing ba bconsistent band beffective blight bresponse bfor
bthe blife bof bthe blens
Factors binfluencing bdarkening/lightening bof bphotochromic blenses binclude
A. bIntensity bof blight
B. bTemperature
C. bAge bof blens
D. bAll bof bthe babove b- b bD. bAll bof bthe babove
UV bfiltering bproperties bare binherent bin bwhich blens?
A. bCR-39
B. bPolycarbonate
C. bTrivex
D. bB b& bC b- b bD. bB b& bC
How bmuch bUV bis babsorbed bby ba bclear bcrown bglass blens? b- b b9%
How bmuch bUV bis babsorbed bby ba bgray b#3 bcrown bglass blens? b- b b82%
How bmuch bUV bis babsorbed bby ba bclear bCR-39 blens? b- b b55%
