Quiz For Free-Form Lenses

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1. direct to surface
2. direct lens technology
3. digital lens processing
4. biconvex

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

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

A free-form generator can be used to:

A customized lens incorporates:

Which of the following is not correct?

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

Ideally, each prescription requires a unique:

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

Free-form generators can produce:

Free-form lenses can be designed with:

Progressive lenses can be made with:

Taking accurate measurements _________________________.

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

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

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

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

Free form lenses are available in the following parameters:

Patients benefit from free-form lenses because:

Most lenses made with free-form technology:

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

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

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

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

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

In “Position of Wear” lenses:

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

The important benefits of all aspheric progressive designs are:

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