ABO PRACTICAL STUDY GUIDE PAPER Questions with Correct
Answers (Grade A+)
Question 1: 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 2: 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 3: 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 4: 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 5: Materials that best produce polarized light by reflectance are called:
A. Diatomic
B. Diametric
C. Dielectric
D. Diabolical.
Answer: c) Dielectric
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,Question 6: 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 7: 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 8: 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 9: The use of multifocal lenses is associated with:
A. Presbyopia
B. Astigmatism
C. Phoria
D. Tropia.
Answer: a) Presbyopia
Question 10: 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
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, Question 11: 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 12: 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 13: 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 14: 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 15: Overall temple measurement is most often stated in:
A. Millimeters
B. Centimeters
C. Decimeters
D. Meters.
Answer: a) Millimeters
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Answers (Grade A+)
Question 1: 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 2: 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 3: 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 4: 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 5: Materials that best produce polarized light by reflectance are called:
A. Diatomic
B. Diametric
C. Dielectric
D. Diabolical.
Answer: c) Dielectric
Page 1
,Question 6: 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 7: 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 8: 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 9: The use of multifocal lenses is associated with:
A. Presbyopia
B. Astigmatism
C. Phoria
D. Tropia.
Answer: a) Presbyopia
Question 10: 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
Page 2
, Question 11: 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 12: 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 13: 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 14: 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 15: Overall temple measurement is most often stated in:
A. Millimeters
B. Centimeters
C. Decimeters
D. Meters.
Answer: a) Millimeters
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