Question 1

Safety lenses are lenses that are:

Accepted Answer

Safety lenses are lenses that are shatterproof. These types of lenses can be prescribed to people who work in hazardous occupations, such as welders or those around dangerous chemicals. They can also be prescribed to those who engage in sports.

Question 2

Having a new lens, such as the lens placed in the eye after cataract surgery, is known as:

Accepted Answer

Having a new lens, such as the lens placed in the eye after cataract surgery, is known as pseudophakia.

Question 3

A patient's spectacle correction should be measured and recorded when? Choose all that apply.

Accepted Answer

At the first visit and after a new prescription has been filled
A patient's spectacle correction should be measured and recorded at their first visit and any subsequent visits in which they receive a new prescription. This is done with an instrument known as a lensometer.

Question 4

What is the recommended height of a bifocal segment?

Accepted Answer

The recommended height of a bifocal segment is at the lower lid margin; however, the patient should always be asked if that height is comfortable for their intended usage and if not it should be adjusted to their specifications.

Question 5

The vertical angle that the frame front makes to the face when glasses are worn is known as:

Accepted Answer

The vertical angle that the frame front makes to the face when glasses are worn is known as the pantoscopic angle. The proper pantoscopic angle can range from 4 to 18 degrees, depending on the patient's facial structure.

Question 6

Which frame materials are hypoallergenic? Choose all that apply.

Accepted Answer

Both beta titanium and aluminum frames are hypoallergenic.
These are the best choices for people with metal allergies. Monel is the most popular made frame material but it is not hypoallergenic because it can be made with any combination of metals.

Question 7

What is the preferred material used for sports frames?

Accepted Answer

The preferred material for sport frames is nylon.
Nylon material for ophthalmic frames was introduced in the 1940's. Nylon blends are resistant to hot and cold temperatures. They can also be flexible and stiff, making them a perfect material to use for sport frames.

Question 8

Which of these statements is not true regarding selecting frames for face shape?

Accepted Answer

Square faces would look better with frames which are wider and have less depth, not square shaped frames.
This can include ovals or rectangle frames. All of these frames will make a face that is square appear longer.

Question 9

Which is worst choice of a frame choice for this prescription?
Prescription: OD -5.00 -2.50 X 85, OS -9.00 -3.50 X 10 with PD of 72

Accepted Answer

The worst frame choice for this prescription would be a drill mount frame.
A drill mounted frame with so much difference in prescription between each eye will noticeable thicker on one side than the other and the integrity of the frame will be reduced.

Question 10

The best frame for a person with one ear much higher than another would be?

Accepted Answer

The best frame for a person with one ear much higher than another would be a metal frame with thinner temples.
A metal frame with spring hinges may not be able to be adjusted enough to allow for the frame to sit straight on the persons face. The zyl frame with wide temples will be nearly impossible to adjust to allow the frame to sit straight on a person who has unequal ears. The easiest frame to adjust for this type of patient would be a metal frame with temples that can withstand the adjustment needed to make one temple higher than the other.

Question 11

Half eye frames are generally used for?

Accepted Answer

Half eye frames are generally used for reading only prescriptions.
Half eye frames are called readers and are worn in prescription for those who usually need astigmatism correction in addition to plus powers. The half eye reader sits low on the bridge of the nose allowing the patient to be able to see distance.
Half eye readers are custom made for those who can't see with over the counter reader prescriptions.

Question 12

What does the 55?18 mean when seen on a frame?

Accepted Answer

The markings of 55?18, indicates that each lens in the frame is 55 mm wide and the bridge is 18mm wide.
This is the measurement from inside the eyewire and does not include the eyewire edge.
This is a crucial measurement that the lab must in addition to the pupillary distance measurement in order to be able to determine where to place the prescription in the frame.

Question 13

Which is not a type of temple used on frames?

Accepted Answer

An eye temple is not a type of temple used on any frame.
A library temple is one that has no bend over the ear, it goes straight back. The skull temple is the most common used temple which can be bent to fit the patient's ears. The cable temple is premade to fit snugly around the ear, usually longer and allows the glasses to stay in place.

Question 14

Who would benefit the most from having a library temple on a pair of glasses?

Accepted Answer

A person who would benefit the most from wearing a library temple is a person who must slide their glasses off and on several times in a day.
People who only need a prescription for reading and want a full field of view for distance will want to take off their readers when not needing them. The library temple makes it easier to slide the temples off the ears and back on.

Question 15

Which is a false statement of a Trivex lens?

Accepted Answer

Not all prescriptions require a thin lightweight lens if they are within a +3 to a -3 range of prescription.
A Trivex lens inheritably has 100% UV protection. Currently in the industry, the Trivex lens has the best clarity, is the most durable and shatterproof.

Question 16

Which photochromic lens listed below will have variances in color depending on the thickness of the lens?

Accepted Answer

A Photo Gray Extra lens will have variances in color depending on the thickness of the lens.
With a plus prescription, the center of the lens will be darker and with a minus lens the center will be lighter in color.

Question 17

Which is not an advantage of a progressive lens over a bifocal or trifocal?

Accepted Answer

A bifocal or trifocal will have advantages over a progressive with clearer peripheral vision in the lenses.
As good as progressives are, most have some peripheral loss on the sides, but it is usually mild and will go away once the patient adapts to the lens prescription.

Question 18

The alignment reference mark on a progressive can indicate?

Accepted Answer

The alignment reference mark on a progressive indicates all of the above.
Below the alignment reference mark on each less will be an engraving of the add power of the lens, the manufacturer and when both are dotted on the lens using a template, you will be able to find not only the DRP but NRP or near reference point as well. The DRP is where you will read the prescription's distance power and the NRP is where you will read the near power.

Question 19

The term short corridor in a progressive lens refers to?

Accepted Answer

The term short corridor in a progressive lens refers to the shorter amount of space in the lens for all ranges of vision going from far to near vertically.
Short corridor lenses are recommended for small frames which have small B measurements and cannot contain a lens with a regular corridor. Trying to fit a regular progressive lens into a small frame will result in either cutting off some of the distance at the top of the lens or the near at the bottom.

Question 20

Which is not a requirement of a basic safety lenses according to ANSI standards?

Accepted Answer

Using the materials of either polycarb, Trivex or SR-91 is not a requirement for basic safety lenses by ANSI.
A basic safety lens has different requirements than a safety high impact lens must have. However the safety high impact does require the use of the either polycarb, Trivex or SR-91.

Quiz 6: Ophthalmic Products