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
c) Groove
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)...
ABO Practice Test
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
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
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
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%
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
Materials that best produce polarized light by reflectance are called:
a) Diatomic
b) Diametric
c) Dielectric
d) Diabolical - Answer c) Dielectric
Coating lenses by depositing a metallic film such as magnesium floride on the surface of a finished lens is done for the following reason: ABO Practice Test
a) Reducing light transmitted
b) Reducing reflections
c) Reducing weight
d) Reducing power - Answer b) Reducing reflections
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
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
The use of multifocal lenses is associated with:
a) Presbyopia
b) Astigmatism
c) Phoria
d) Tropia - Answer a) Presbyopia
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
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
When using the boxing method to measure a lens, the "A" dimension refers to: ABO Practice Test
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
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
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
Overall temple measurement is most often stated in:
a) Millimeters
b) Centimeters
c) Decimeters
d) Meters - Answer a) Millimeters
Iseikonic lenses are used for the correction of:
a) Aniseikonia
b) Exophoria
c) Emmetropia
d) Esophoria - Answer a) Aniseikonia
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
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