Quiz For Aspheric Lenses

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

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

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

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

_______________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

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

__________ 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.

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

________________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.

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

When white light enters a prism:

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

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

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

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

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

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

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

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

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

In 1911 Zeiss introduced the _____________________corrected curve lens series.

In 1926 American Optical introduced the _____________________corrected curve lens series.

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

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

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

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

Aspheric Lenses

The sharpest most distortion free vision can be obtained by:

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

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

When fitting aspheric lenses:

In general:

What is another term for a progressive lens design

Which of these is not considered a lens aberration

What is true about the aperture of the eye

Distortion of image:

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

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

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

Which of these is not a conic section