Quiz For Progressive and Advanced Design Multifocal Lenses

The Varilux 2 by Silor and the AO UltraVue were introduced in the:

early sixties

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early seventies

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early eighties

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early nineties

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The continuous increase in plus power in a progressive lens is produced by a curve

in which the radius of curvature gradually becomes shorter as the power progresses from distance to near

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in which the radius of curvature gradually becomes longer as the power progresses from distance to near

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in which the index of refraction of the lens material gradually increases as the power progresses from distance to near

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in which the index of refraction of the lens material gradually decreases as the power progresses from distance to near

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The removable ink markings on a progressive lens are for the purpose of: 1. lens verification 2. layout 3. identifying the lens manufacturer 4. verifying the add power

1 only

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1 & 2

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1, 2, & 3

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3 & 4

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The permanent semi-visible markings which are engraved on the lens surface are for the purpose of: 1. lens verification 2. layout 3. identifying the lens manufacturer 4. verifying the add power

1 only

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1 & 2

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1, 2, 3, & 4

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3 & 4

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The amount of surface astigmatism present in a progressive addition lens is dependent upon: 1. the add power 2. the length of the progressive corridor 3. the width of the distance and near zones 4. the base curve

1 only

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1 & 2

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1, 2, & 3

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1, 2, 3, & 4

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A hard design progressive lens: 1. positions the astigmatism into a smaller more concentrated area of the lens 2. results in wider distance and near zones 3. spreads the area of distortion over a wider area of the lens 4. results in smaller distance and near zones

1 only

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1 & 2

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1 & 3

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3 & 4

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A soft design progressive lens: 1. positions the astigmatism into a smaller more concentrated area of the lens 2. results in wider distance and near zones 3. spreads the area of distortion over a wider area of the lens 4. results in smaller distance and near zones

1 only

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1 & 2

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1 & 3

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3 & 4

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When the design of a progressive lens is modified for each add power to maximize the width of the progressive channel and the reading area, it is called a ___________ design.

mono

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multi

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prescription based

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asymmetric

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A progressive lens design in which the right and left lens is identical is known as:

symmetric design

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asymmetric design

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hard design

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prescription-based design

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Modifications of the progressive design as the base curve changes is known as:

symmetric design

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asymmetric design

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hard design

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prescription based design

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______________ refers to how the design handles unwanted power changes that are pushed to either side of the progressive channel and reading area.

symmetric design

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asymmetric design

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hard & soft design

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prescription based design

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During the manufacturing process of ____________________ the computer calculates each component of the prescription to provide the identical correction when the lenses are actually worn.

all aspheric designs

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atoric progressives

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personalized PAL products

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none of the above

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“Position of Wear,” “Retina Forward Design” and “Zeiss Measurement Value System” are terms that refer to:

compensated prescriptions

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prescribed power

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aspheric designs

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atoric designs

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Progressive designs that are asymmetric are:

designed differently for each add power

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designed differently for left and right lenses

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designed differently for plus or minus powers

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for small frames

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_______________ are among the inherent limitations in progressive lens design.

restricted visual fields

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compromised optics

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off-center astigmatism

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all of the above

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In selecting progressives for a patient, the best policy its to:

find one design that works well and use it for everyone

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change progressive design only when the patient asks for a different brand

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select the progressive design based on each patient's needs

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change progressive design only when a shallow frame style is used

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When dispensing progressives which type of frame is preferred:

the type of frame selected doesn’t matter as long as there is room for the progressive

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frames or mountings with adjustable pads are preferred

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plastic frames without pad arms are preferred

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an aviator style frame

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A short corridor progressive should be recommended when:

the patient asks for it

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the prescription indicates the need

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the patient chooses a small shallow frame design

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the fitting cross height is higher than the manufacturer’s minimum fitting height

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To minimize progressive lens refits: 1. when measuring vertical height anticipate frame slippage 2. verify the lens on the patient 3. demonstrate power changes in the periphery 4. use positive words

1 only

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1 & 2

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1, 2, & 3

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1, 2, 3, & 4

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A progressive lens is considered “short corridor” when its recommended minimum fitting height is ______ mm and below.

26

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22

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18

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14

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Short corridor lens designs need to be especially precise because: 1. there is less material to work with 2. there is less margin for error 3. they are a scaled down version of standard PALs 4. they are available in CR 39 only

1 only

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1 & 2

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1, 2, & 3

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1, 2, 3, & 4

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Aspheric and atoric designs are often incorporated into short corridor designs in order to: 1. reduce weight and thickness 2. create a smoother transition between zones 3. facilitate prism thinning 4. minimize edge thickness

1 only

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1 & 2

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1, 2, & 3

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1, 2, 3, & 4

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When the progressive curves are positioned on the back surface of the lens:

visual fields are expanded

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magnification differences in various parts of the lens are minimized

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ease of wearing is improved

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all of the above

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Short corridor lenses are generally recommended when the B measurement is less than ____ mm.

50

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40

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30

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20

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Some short corridor lenses can be fit as high as ____ mm.

22

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24

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26

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30

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When fitting short corridor lenses it’s best to:

measure the monocular PD using a pupilometer

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measure the monocular fitting height

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use the manufacturer’s cut out guide

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all of the above

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The best way to gather the required patient information is:

ask questions during the dispensing operation

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ask questions during the refraction

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ask them when they make their appointment on the phone

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have them fill out a Lifestyle Questionnaire when they first visit the office

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Explaining how progressive lenses do their work is important for:

first-time progressive wearers only

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only patients changing from bifocals to progressives

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every progressive patient

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only patients having trouble adjusting to their new lenses

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The best procedure in dispensing progressives is:

discuss and determine which lenses will be ordered first

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patient should select their frame first

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it doesn’t matter which is discussed first, frame or lenses

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When troubleshooting progressive lenses you notice the patient moves the reading material off to one side for a better focus. This would indicate:

the PD is off

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the lenses are fit too low

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the lenses are fit too high

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an incorrect power through the distance zone

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Upon what process are wave-front progressive lenses based?

LASIK surgery

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symmetric design

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intermediate design

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Trivex design

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Which of these would not be considered biometric data?

head rotation

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an Rx with aberration analysis

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eye center of rotation

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minimum blank size

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What can change the effective diopter of the lens?

vertex distance

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blank size

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lens brand

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patient PD

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In general, a larger vertex distance may:

be good for all PAL designs

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require shorter corridors

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inhibit patient vision

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require a larger inset

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Which of these is not a short corridor PAL?

Eclipse 360

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Choice Plus V

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Kodak Concise Digital

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Seiko Superior

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What must an ECP always do before verifying a PAL?

dot and reapply the markings

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clean all markings from the lens

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determine the lens material

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determine the patient biometrics

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Which of these could be a reason the patient describes a PAL as “unusable”?

the compensated prescription and written prescription give the same vision

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the fitting cross is in front of the patient’s pupil

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the patient has not used the lens for enough time to properly adapt

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the patient’s PD was monocular

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What would be a positive word when explaining adapation to a patient?

learn

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face form adjustment

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aberrations

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swim

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What is image swim?

a lens design for better patient adaptation

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the distortion in a PAL that is seen by the wearer as unnecessary movement

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free-form point placement

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the movement of a PAL generator

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What will lenses designed to balance right and left vision do for a patient?

reduce the lens weight

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reduce magnification

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increase magnification

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enhance binocular vision

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Quiz For Progressive and Advanced Design Multifocal Lenses

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