ABO Practice Test | Questions with 100% Verified Answers |
Latest Update 2026/2027
Question: To mount a lens in a nylon suspension type frame, it would be necessary to _______ the lens.
a) Drill
b) Notch
c) Groove
d) V-Bevel
Answer: c) Groove
Question: The optical center of a lens is:
a) At the geometrical center
b) One the 180 line
c) At the point where the "a" and "b" measurement meet
d) A lens location of zero deviation of the optical axis
Answer: d) A lens location of zero deviation of the optical axis
Question: The progressive power lens has a progressive zone after where power:
a) Gradually increases
b) Of the cylindrical increases
c) Stays the same
d) Abruptly changes
Answer: a) Gradually increases
Question: Standard transmissions in sunlenses should range between
a) 10% and 30%
b) 15% and 30%
c) 10% and 25%
d) 15% and 25%
Answer: b) 15% and 30%
Question: OC placement verification is important to ensure:
a) Accuracy of patient pd
b) Correct power of the add
c) That there is no unwanted prismatic effect
d) None of the above
Answer: c) That there is no unwanted prismatic effect
Question: Materials that best produce polarized light by reflectance are called:
a) Diatomic
b) Diametric
c) Dielectric
d) Diabolical
Answer: c) Dielectric
,Question: Coating lenses by depositing a metallic film such as magnesium floride on the surface of a finished
lens is done for the following reason:
a) Reducing light transmitted
b) Reducing reflections
c) Reducing weight
d) Reducing power
Answer: b) Reducing reflections
Question: Aspheric lens surfaces are most commonly used with:
a) Lenses of low refractive power
b) Occluder lenses
c) High plus lenses
d) Sunglasses
Answer: b) Occluder lenses
Question: The most commonly used prescription for correcting muscle imbalance in a case of esotrophia would
be:
a) Plus sphere
b) Minus cylinder
c) Base in prism
d) Base out prism
Answer: d) Base out prism
Question: The use of multifocal lenses is associated with:
a) Presbyopia
b) Astigmatism
c) Phoria
d) Tropia
Answer: a) Presbyopia
Question: When the optician advies the consumer as to the breakage of lenses, the risk of injury should be
described in terms of:
a) Impact resistance
b) Shatterproff
c) Lens inspection
d) Lens verification
Answer: a) Impact resisitance
Question: When fitting progressive power lenses, certain critical measurements are taken, one of the most
important is the:
a) Lens size
b) Bridge size measurement
c) Monocular pupillary measurement
d) Temple length measurement
Answer: c) Monocular pupillary measurement
Question: When using the boxing method to measure a lens, the "A" dimension refers to:
a) The longest diagonal measurement
b) The longest up and down measurement
c) The distance across the lens at the widest point
d) Twice the ED
Answer: c) The distance across the lens at the widest point
, Question: Some characteristics of minus lenses include:
a) Magnifies images, converge light rays images, power
weakens as vertex shortens
b) Minifies images, diverges light rays images, power
strengthens as vertex shortens
c) Magnify images, diverges light rays images, power
strengthens as vertex shortens
d) Minifies images, diverges light rays images, power weakens
as vertex shortens
Answer: b) Minifies images, diverges light raysimages, power strengthens as vertex shortens
Question: What is the advantage of a short corridor progressive design>
a) It allows the use of shallow "B" measurement frames
b) It creates asymmetrical design which puts less surface
astigmatism in the temporal portion of the lens
c) It helps the designer use the maximum amount of
asphericity from the top to the bottom of the lens
d) They are less expensive to make because the corridor is
shorter and therefore requires less production costs
Answer: a) It allows the use of shallow "B" measurement frames
Question: Overall temple measurement is most often stated in:
a) Millimeters
b) Centimeters
c) Decimeters
d) Meters
Answer: a) Millimeters
Question: Iseikonic lenses are used for the correction of:
a) Aniseikonia
b) Exophoria
c) Emmetropia
d) Esophoria
Answer: a) Aniseikonia
Question: The modern lens material thought to have the most resistance to impact is:
a) Aspheric
b) Crown glass
c) CR-39
d) Trivex
Answer: d) Trivex
Question: The type of bridge on a plastic frame designed to rest entirely on nose pads is the:
a) Full saddle
b) Semi-saddle
c) Sculptured
d) Keyhole
Answer: d) Keyhole
Latest Update 2026/2027
Question: To mount a lens in a nylon suspension type frame, it would be necessary to _______ the lens.
a) Drill
b) Notch
c) Groove
d) V-Bevel
Answer: c) Groove
Question: The optical center of a lens is:
a) At the geometrical center
b) One the 180 line
c) At the point where the "a" and "b" measurement meet
d) A lens location of zero deviation of the optical axis
Answer: d) A lens location of zero deviation of the optical axis
Question: The progressive power lens has a progressive zone after where power:
a) Gradually increases
b) Of the cylindrical increases
c) Stays the same
d) Abruptly changes
Answer: a) Gradually increases
Question: Standard transmissions in sunlenses should range between
a) 10% and 30%
b) 15% and 30%
c) 10% and 25%
d) 15% and 25%
Answer: b) 15% and 30%
Question: OC placement verification is important to ensure:
a) Accuracy of patient pd
b) Correct power of the add
c) That there is no unwanted prismatic effect
d) None of the above
Answer: c) That there is no unwanted prismatic effect
Question: Materials that best produce polarized light by reflectance are called:
a) Diatomic
b) Diametric
c) Dielectric
d) Diabolical
Answer: c) Dielectric
,Question: Coating lenses by depositing a metallic film such as magnesium floride on the surface of a finished
lens is done for the following reason:
a) Reducing light transmitted
b) Reducing reflections
c) Reducing weight
d) Reducing power
Answer: b) Reducing reflections
Question: Aspheric lens surfaces are most commonly used with:
a) Lenses of low refractive power
b) Occluder lenses
c) High plus lenses
d) Sunglasses
Answer: b) Occluder lenses
Question: The most commonly used prescription for correcting muscle imbalance in a case of esotrophia would
be:
a) Plus sphere
b) Minus cylinder
c) Base in prism
d) Base out prism
Answer: d) Base out prism
Question: The use of multifocal lenses is associated with:
a) Presbyopia
b) Astigmatism
c) Phoria
d) Tropia
Answer: a) Presbyopia
Question: When the optician advies the consumer as to the breakage of lenses, the risk of injury should be
described in terms of:
a) Impact resistance
b) Shatterproff
c) Lens inspection
d) Lens verification
Answer: a) Impact resisitance
Question: When fitting progressive power lenses, certain critical measurements are taken, one of the most
important is the:
a) Lens size
b) Bridge size measurement
c) Monocular pupillary measurement
d) Temple length measurement
Answer: c) Monocular pupillary measurement
Question: When using the boxing method to measure a lens, the "A" dimension refers to:
a) The longest diagonal measurement
b) The longest up and down measurement
c) The distance across the lens at the widest point
d) Twice the ED
Answer: c) The distance across the lens at the widest point
, Question: Some characteristics of minus lenses include:
a) Magnifies images, converge light rays images, power
weakens as vertex shortens
b) Minifies images, diverges light rays images, power
strengthens as vertex shortens
c) Magnify images, diverges light rays images, power
strengthens as vertex shortens
d) Minifies images, diverges light rays images, power weakens
as vertex shortens
Answer: b) Minifies images, diverges light raysimages, power strengthens as vertex shortens
Question: What is the advantage of a short corridor progressive design>
a) It allows the use of shallow "B" measurement frames
b) It creates asymmetrical design which puts less surface
astigmatism in the temporal portion of the lens
c) It helps the designer use the maximum amount of
asphericity from the top to the bottom of the lens
d) They are less expensive to make because the corridor is
shorter and therefore requires less production costs
Answer: a) It allows the use of shallow "B" measurement frames
Question: Overall temple measurement is most often stated in:
a) Millimeters
b) Centimeters
c) Decimeters
d) Meters
Answer: a) Millimeters
Question: Iseikonic lenses are used for the correction of:
a) Aniseikonia
b) Exophoria
c) Emmetropia
d) Esophoria
Answer: a) Aniseikonia
Question: The modern lens material thought to have the most resistance to impact is:
a) Aspheric
b) Crown glass
c) CR-39
d) Trivex
Answer: d) Trivex
Question: The type of bridge on a plastic frame designed to rest entirely on nose pads is the:
a) Full saddle
b) Semi-saddle
c) Sculptured
d) Keyhole
Answer: d) Keyhole
