Quiz For Aspheric Lenses

1 point(s)

Most eyeglass wearers prefer their eyeglass lenses made so that they are:

made with some distortion

Correct Incorrect Correct answer

heavy

Correct Incorrect Correct answer

as thin as practical

Correct Incorrect Correct answer

tinted slightly

Correct Incorrect Correct answer

1 point(s)

One way to obtain a flatter lens when using conventional spherical lens design is to:

flatten the base curve

Correct Incorrect Correct answer

steepen the base curve

Correct Incorrect Correct answer

use a lens material with a lower index of refraction

Correct Incorrect Correct answer

change the prescription

Correct Incorrect Correct answer

1 point(s)

Arbitrarily flattening the curves of a lens made with spherical surfaces:

can significantly compromise the optics

Correct Incorrect Correct answer

has no effect on the optics

Correct Incorrect Correct answer

increases the vertex distance when the gaze is directed through the optical center of the lens

Correct Incorrect Correct answer

decreases the vertex distance when the gaze is directed through the optical center of the lens

Correct Incorrect Correct answer

1 point(s)

When ___________________ it is as if there were errors in power from the desired prescription.

light is reflected off a flat shiny surface

Correct Incorrect Correct answer

white light is dispersed into its component colors

Correct Incorrect Correct answer

anti-reflection coating is applied to a lens

Correct Incorrect Correct answer

an aberration occurs

Correct Incorrect Correct answer

1 point(s)

_______________occurs when light rays from the peripheral edge of a lens are refracted to a greater degree than the light rays passing through the center of the lens

spherical aberration

Correct Incorrect Correct answer

coma

Correct Incorrect Correct answer

marginal astigmatism

Correct Incorrect Correct answer

curvature of field

Correct Incorrect Correct answer

1 point(s)

___________________________occurs when light entering a lens an oblique angle is bent to varying degrees depending upon the point of entry.

spherical aberration

Correct Incorrect Correct answer

coma

Correct Incorrect Correct answer

marginal astigmatism

Correct Incorrect Correct answer

curvature of field

Correct Incorrect Correct answer

1 point(s)

__________ occurs when a narrow beam of light enters a lens at an oblique angle, and the rays at opposite meridians within the beam are focused on different paths.

spherical aberration

Correct Incorrect Correct answer

coma

Correct Incorrect Correct answer

marginal astigmatism

Correct Incorrect Correct answer

curvature of field

Correct Incorrect Correct answer

1 point(s)

_____________________________aberration is caused by projecting the image of a flat object onto a curved surface

spherical aberration

Correct Incorrect Correct answer

coma

Correct Incorrect Correct answer

marginal astigmatism

Correct Incorrect Correct answer

curvature of field

Correct Incorrect Correct answer

1 point(s)

________________occurs when the curvature of the lens which causes the beneficial redirection of light rays also has the negative effect of “bending” the image of a straight line.

spherical aberration

Correct Incorrect Correct answer

coma

Correct Incorrect Correct answer

distortion

Correct Incorrect Correct answer

chromatic aberration

Correct Incorrect Correct answer

1 point(s)

____________________aberration is a consequence of the dispersive properties of the actual lens material rather than a function of lens design.

spherical aberration

Correct Incorrect Correct answer

coma

Correct Incorrect Correct answer

distortion

Correct Incorrect Correct answer

chromatic aberration

Correct Incorrect Correct answer

1 point(s)

When white light enters a prism:

it is undeviated

Correct Incorrect Correct answer

it is bent toward the apex

Correct Incorrect Correct answer

it is bent toward the base

Correct Incorrect Correct answer

it is completely absorbed by the material

Correct Incorrect Correct answer

1 point(s)

The _____________________is an indication of a lens material’s ability to disperse white light into its component colors.

ABBE value

Correct Incorrect Correct answer

polarization effect

Correct Incorrect Correct answer

AR coating used

Correct Incorrect Correct answer

index of refraction

Correct Incorrect Correct answer

1 point(s)

Lens manufacturers have minimized the effects of lens aberrations by developing what is called:

the no curve theory

Correct Incorrect Correct answer

best form lens design

Correct Incorrect Correct answer

superior AR coating

Correct Incorrect Correct answer

the polarization effect

Correct Incorrect Correct answer

1 point(s)

It is possible to approximate the “best form” base curve for a given prescription using __________________.

Prentice’s rule

Correct Incorrect Correct answer

polarized lenses

Correct Incorrect Correct answer

polycarbonate lenses

Correct Incorrect Correct answer

Vogel’s formula

Correct Incorrect Correct answer

1 point(s)

Using Vogel’s formula, approximate the “best form” base curve for the following Rx:
+1.50 sph

+ 2.50 D

Correct Incorrect Correct answer

+ 4.50 D

Correct Incorrect Correct answer

+7.50 D

Correct Incorrect Correct answer

+ 9.50

Correct Incorrect Correct answer

1 point(s)

Using Vogel’s formula, approximate the “best form” base curve for the following Rx:
-2.50 sph

+ 2.75 D

Correct Incorrect Correct answer

+ 4.75 D

Correct Incorrect Correct answer

+ 6.75 D

Correct Incorrect Correct answer

+ 8.75 D

Correct Incorrect Correct answer

1 point(s)

Using Vogel’s formula, approximate the “best form” base curve for the following Rx:
-4.00 – 2.00 x 180

+ 2.50 D

Correct Incorrect Correct answer

+ 3.50 D

Correct Incorrect Correct answer

+ 6.50 D

Correct Incorrect Correct answer

+ 8.50 D

Correct Incorrect Correct answer

1 point(s)

As early as 1690 Dutch mathematician _____________________ determined that aberrations could be controlled my manipulating lens curvature.

Cristian Huygens

Correct Incorrect Correct answer

William Hyde Wollaston

Correct Incorrect Correct answer

Ostwalt

Correct Incorrect Correct answer

Mariius Tscherning

Correct Incorrect Correct answer

1 point(s)

In 1804 English physicist ____________________ began work on lenses that were specifically designed to manage image degrading aberrations.

Cristian Huygens

Correct Incorrect Correct answer

William Hyde Wollaston

Correct Incorrect Correct answer

Ostwalt

Correct Incorrect Correct answer

Mariius Tscherning

Correct Incorrect Correct answer

1 point(s)

In 1904 Danish Ophthalmologist ____________________ developed a series of formulas dealing with oblique astigmatism.

Cristian Huygens

Correct Incorrect Correct answer

William Hyde Wollaston

Correct Incorrect Correct answer

Ostwalt

Correct Incorrect Correct answer

Mariius Tscherning

Correct Incorrect Correct answer

1 point(s)

In 1911 Zeiss introduced the _____________________corrected curve lens series.

Punktal

Correct Incorrect Correct answer

Tillyer Masterpiece

Correct Incorrect Correct answer

Orthogon

Correct Incorrect Correct answer

Hi-Index

Correct Incorrect Correct answer

1 point(s)

In 1926 American Optical introduced the _____________________corrected curve lens series.

Punktal

Correct Incorrect Correct answer

Tillyer Masterpiece

Correct Incorrect Correct answer

Orthogon

Correct Incorrect Correct answer

Hi-Index

Correct Incorrect Correct answer

1 point(s)

In 1928 Bausch & Lomb introduced the _____________________corrected curve lens series.

Punktal

Correct Incorrect Correct answer

Tillyer Masterpiece

Correct Incorrect Correct answer

Orthogon

Correct Incorrect Correct answer

Hi-Index

Correct Incorrect Correct answer

1 point(s)

When aspheric lenses are used for spectacle lenses they typically produce:

aberrations

Correct Incorrect Correct answer

steeper curves

Correct Incorrect Correct answer

thicker lenses

Correct Incorrect Correct answer

a thinner lens

Correct Incorrect Correct answer

1 point(s)

If asphericity is applied to the front curve of a plus lens:

the surface will become flatter away from the center

Correct Incorrect Correct answer

the surface will become steeper away from the center

Correct Incorrect Correct answer

it will produce unwanted prism

Correct Incorrect Correct answer

it will produce additional marginal astigmatism

Correct Incorrect Correct answer

1 point(s)

If asphericity is applied to the front curve of a minus lens:

the surface will become flatter away from the center

Correct Incorrect Correct answer

the surface will become steeper away from the center

Correct Incorrect Correct answer

it will produce unwanted prism

Correct Incorrect Correct answer

it will produce additional marginal astigmatism

Correct Incorrect Correct answer

1 point(s)

Aspheric Lenses

utilize a spherical surface to neutralize oblique astigmatism

Correct Incorrect Correct answer

are exactly the same as best form lenses

Correct Incorrect Correct answer

are not as cosmetically pleasing as spherical lenses

Correct Incorrect Correct answer

utilize a non-spherical surface to neutralize oblique astigmatism

Correct Incorrect Correct answer

1 point(s)

The sharpest most distortion free vision can be obtained by:

looking through the optical center of the lens

Correct Incorrect Correct answer

looking through the peripheral portion of the lens

Correct Incorrect Correct answer

experimenting with the base curve of the lens

Correct Incorrect Correct answer

increasing the pantoscopic tilt

Correct Incorrect Correct answer

1 point(s)

If an aspheric shape is applied to the back surface of a plus lens:

the surface will become steeper away from the center

Correct Incorrect Correct answer

the surface will become flatter away from the center

Correct Incorrect Correct answer

there will be no change in the shape of the surface

Correct Incorrect Correct answer

aspheric lenses should not be used

Correct Incorrect Correct answer

1 point(s)

If an aspheric shape is applied to the back surface of a minus lens:

the surface will become steeper away from the center

Correct Incorrect Correct answer

the surface will become flatter away from the center

Correct Incorrect Correct answer

there will be no change in the shape of the surface

Correct Incorrect Correct answer

aspheric lenses should not be used

Correct Incorrect Correct answer

1 point(s)

When fitting aspheric lenses:

prism should be induced through decentration whenever possible

Correct Incorrect Correct answer

prism should never be induced through decentration

Correct Incorrect Correct answer

always use a lens clock to measure the curves

Correct Incorrect Correct answer

instruct the laboratory to grind for decentration when necessary

Correct Incorrect Correct answer

1 point(s)

In general:

smaller lens sizes result in more distortion

Correct Incorrect Correct answer

higher index materials never have distortion

Correct Incorrect Correct answer

lower index materials never have distortion

Correct Incorrect Correct answer

higher diopter plus lenses should be made with an aspheric design

Correct Incorrect Correct answer

1 point(s)

What is another term for a progressive lens design

PALs

Correct Incorrect Correct answer

chromatic lenses

Correct Incorrect Correct answer

basic lens

Correct Incorrect Correct answer

distortion lens

Correct Incorrect Correct answer

1 point(s)

Which of these is not considered a lens aberration

coma

Correct Incorrect Correct answer

curvature of field

Correct Incorrect Correct answer

distortion

Correct Incorrect Correct answer

index

Correct Incorrect Correct answer

1 point(s)

What is true about the aperture of the eye

small apertures maximize aberrations

Correct Incorrect Correct answer

small apertures minimize aberrations

Correct Incorrect Correct answer

the size of the aperture does not matter

Correct Incorrect Correct answer

a large aperture is not achieved with dilation

Correct Incorrect Correct answer

1 point(s)

Distortion of image:

is not significant

Correct Incorrect Correct answer

only occurs in a barrel type image

Correct Incorrect Correct answer

occurs with every lens

Correct Incorrect Correct answer

only occurs with high-index materials

Correct Incorrect Correct answer

1 point(s)

Why are spectacle lenses for the correction of aphakia being used with diminishing frequency

prohibitive cost

Correct Incorrect Correct answer

patients no longer have aphakia

Correct Incorrect Correct answer

aphakia does not need any correction

Correct Incorrect Correct answer

intraocular lens implants (IOLs) are now frequently used

Correct Incorrect Correct answer

1 point(s)

When fitting an aspheric lens, which of these steps is incorrect

take the monocular PD

Correct Incorrect Correct answer

adjust the frame before taking measurements

Correct Incorrect Correct answer

use a vertex distance of 15 mm or more

Correct Incorrect Correct answer

check the lens cut out chart

Correct Incorrect Correct answer

1 point(s)

What can be a benefit to a lab that produces aspheric lenses

small initial costs of equipment

Correct Incorrect Correct answer

a reduction in the number of overall lenses needed for inventory

Correct Incorrect Correct answer

higher costs due to more lens weight

Correct Incorrect Correct answer

a larger inventory set up needed

Correct Incorrect Correct answer

1 point(s)

Which of these is not a conic section

sphere

Correct Incorrect Correct answer

circle

Correct Incorrect Correct answer

ellipse

Correct Incorrect Correct answer

parabola

Correct Incorrect Correct answer

Quiz For Aspheric Lenses

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