Plastic lenses are made of a hard resin material known as :

CR-39

Corrected curve lenses have ______.

Less oblique astigmatism

To widen the distance between the pads of a frame or mounting, bend the pad arms:

Outward

A patient stops into your dispensary for an adjustment of his glasses. After careful inspection, you find the only thing wrong is that there is too much pantoscopic tilt. To make the necessary adjustment you will:

Angle the temples upward from the endpieces

Aspheric lens surfaces are most commonly used with:

Cataract lenses

Myopia is usually associated with:

A longer than normal eyeball

The most commonly used prescription for correcting muscle imbalance in extropia would be:

Base in prism

An ophthalmic correction from an ametrope is to focus parallel incident light rays at the:

Far point of the eye

The imaginary ocular plane lying on the X and Y axis is called:

Listing's Plane

What is NOT a factor in determining vertical imbalance?

The ADD power

A vertometer cannot measure or locate the ______________.

Top of a bifocal segment

A very good CR-39 lens is commonly used in cataract case is a:

Lenticular

What affects the vertex power of a lens?

Thickness

The instrument that opticians commonly use to measure vertex distance:

Distometer

If the right temple is angled down, this adjustment will:

Raise the right side of the front

If the pad arms are lengthened, this adjustment will:

Push the front out more

Image size is always increased if you:

Increase the front curve

A slab-off should be ground in the lens which was the:

Most minus power

Most aspheric surfaces are:

Spherical

A ptosis crutch is used to give support to:

Upper lid

The main reason for the use of lenticular lenses from high plus powers would be:

Lighter weight

Astigmatism is corrected by a lens having:

Cylinder power

The prism measurement indicator found in a vertometer or lensometer is called the:

Reticle

The main reason for the use of Iseikonic lenses is to:

Match image sizes

When a frame is said to have retroscopic tilt, the following condition is meant:

The bottoms of the eyewires are out further than the top

The plier best used for adjustment of rocking pads is:

Half round

When selecting a frame for a potential progressive power lens candidate, avoid the following:

Aviator shape, frame PD larger than patient PD

A reverse slab-off should be used in the eye which has the:

Most plus power

The modern lens material thought to have the most resistance to impact is called:

Polycarbonate

Bicentric grinding is synonymous with:

Slab- off

A slab-off, which is ground to reduce vertical imbalance at near, creates base _______ prism in the near portion of the lens.

Up

A reverse slab-off is molded with base ________ prism in the near portion of the lens

Down

When measuring the segment height for a progressive power lens, you should measure:

From the center of the pupil to the lowest portion of the eyewire

The "boxing method" locates the:

Geometric center of a lens

If the pad arms are bent up and the pads realigned, this adjustment will:

Drop the front

As the pantoscopic angle is increased:

The optical centers should be lowered

The type of bridge on a plastic frame designed to rest entirely on nose pads is the:

Keyhole

If the eyewire touches the cheeks, the adjustment to take care of this condition would be:

Decrease pantoscopic tilt

To widen the distance between the pads of a frame or mounting, bend the pad arms:

Outward; Angle the temples upward from the endpieces

Bowing temples in an expression referring to:

Curving temples around the head