Quiz For Free-Form Lenses

1 point(s)

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direct to surface
direct lens technology
digital lens processing
biconvex

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 skilled optical journeyman

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A state-of-the art fining process,

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A sophisticated software program specifically calculated to each Rx

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Accurate frame measurements

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optimized

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framitized

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personalized

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homogenized

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1 point(s)

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optimized

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framitized

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personalized

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homogenized

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1 point(s)

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optimized

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framitized

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personalized

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homogenized

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1 point(s)

Which of the following is not part of traditional surfacing process:

generating

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fining

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polishing

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position of wear

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1 point(s)

Which of the following in not an advantage of free-form lenses:

They are not limited by pre-determined base curves

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They eliminate the need for stock lenses

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They minimizes PAL non-adapts

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They all automatically come with AR coating

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1 point(s)

A free-form generator can be used to:

produce virtually any shape regardless of how complex

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make molds used in surfacing semi-finished lenses

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manufacturer complete lenses on demand

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all of the above

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1 point(s)

A customized lens incorporates:

the patient’s complete Rx

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the frame dimensions

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the wearing position of the completed eyewear

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all of the above

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1 point(s)

Which of the following is not correct?

A free-form generator can be used to create a standard non-customized lens

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Free-form manufacturing makes customization possible

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Free-form manufacturing will always produce a better lens

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The term free-form refers to a manufacturing process, not a lens

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1 point(s)

The sophisticated computer software used in free-form lens manufacturing allows for the input of:

a prescription

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frame fitting details such as face form, pantoscopic tilt, and vertex distance

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frame dimensions such as “A” measurement, “B” measurement and effective diameter

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all of the above

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1 point(s)

Ideally, each prescription requires a unique:

cylinder axis

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edge thickness

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base curve

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AR coating

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1 point(s)

After a lens is manufactured on a free-form generator the next step is:

fining

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polishing using conformable tools

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cutting and edging

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AR coating

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1 point(s)

Free-form generators can produce:

progressive surfaces

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aspheric surfaces

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atoric surfaces

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all of the above

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1 point(s)

Free-form lenses can be designed with:

the progressive curve on the back side of the lens

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the progressive portion on both the front and the back

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base curves fabricated specifically for each individual lens

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all of the above

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1 point(s)

Progressive lenses can be made with:

traditional front molded designs that have been made using molds that have been digitally manufactured

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traditional front molded designs with digital back side surfacing

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front side spherical curves with the progressive design on the back of the lens. Also known as “internal” technology

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all of the above

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1 point(s)

Taking accurate measurements _________________________.

remains a critical ingredient for success when fitting any PAL

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is no longer necessary when fitting free-form lenses

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is only necessary with higher cylinder powers

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Is only necessary when incorporating personalized wearing parameters

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1 point(s)

Which of the following are necessary when fitting any progressive lens?

monocular PDs, preferably with the use of a pupilometer
monocular fitting height using a PD ruler to measure from the lowest point of each eyewire to the center of the patient’s pupil
verify the lens cut-out utilizing the manufacturer’s cut-out chart
pre-adjust the frame for positive frame form and pantoscopic tilt

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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1 point(s)

A key point in presenting free-form lenses to the patient is to emphasize that:

the lenses are custom made especially for their prescription
the lenses are easy to adapt to
levels of unwanted astigmatism are lowered
they can accommodate relatively unusual powers such as lenses containing high cylinder power

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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1 point(s)

Free form lenses are available in the following parameters:

+4.00D to -6.00D sphere on a 2.00D cylinder

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+8.00D to -12.00D sphere on a 4.00D cylinder

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+2.00D to -2.00D sphere on a 2.00D cylinder

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none of the above

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1 point(s)

Patients benefit from free-form lenses because:

they require little to virtually no adaptation process

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no “swim & sway” complaints

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each lens can be custom made to precise measurements

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all of the above

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1 point(s)

Most lenses made with free-form technology:

have the same fundamentals

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use aspheric or atoric curves

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can reduce aberrations by levels by levels greater than those achieved with conventional techniques

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all of the above

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1 point(s)

Monocular PDs, monocular fitting height, vertex distance, face form, pantnoscopic tilt, are generally required when ordering _________________

atoric single vision lenses

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position-of-wear lenses

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frametization

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PALs processed using traditional surfacing techniques

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1 point(s)

The manufacturing technique based on free-form PAL designs that are customized based on the shape and dimensions of the frame is known as:

atoric single vision

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position-of-wear

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frametization

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head & eye movement techniques

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1 point(s)

“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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1 point(s)

A distinction is made between the measured and prescribed power because:

the trial lens and the spectacle lens have a different shape
the trial lens and the spectacle lens have a different power
different paths taken by the rays of light during measurement in the phoropter and the paths taken when actually being worn by the patient
no such distinction is necessary

1 only

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1, 2, & 3

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1 & 3

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4

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1 point(s)

In “Position of Wear” lenses:

the wearer experiences exactly the same power through the near vision which was found to be best during the refraction

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the measured and prescribed power through the distance vision varies significantly

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the center of rotation induces unwanted prism

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internal lens design is not available

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1 point(s)

In “Position of Wear” lenses the purpose for including the specified power for near vision on the lens packaging:

helps to identify the lens material and index of refraction

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allows the base curve to be verified

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allows the distance vision Rx to be checked in the lensometer

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allows the near vision Rx to be checked in the lensometer

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1 point(s)

The important benefits of all aspheric progressive designs are:

a more attractive appearance

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they aren’t sold in discount optical stores

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they provide enhanced vision

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both a more attractive appearance and provide enhanced vision

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1 point(s)

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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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