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optitcian > quizes 2 > Flashcards

quizes 2 Flashcards

1
Q

Which of these lenses can be made the thinnest?

A

Polycarbonate.

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2
Q

Which of these lens options is best for a school bus driver?

A

Polarized lenses

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3
Q

Which of these materials has a refractive index of 1.523?

A

Crown glass.

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4
Q

Which of these lenses acts a little like a venetian blind, stopping horizontal light rays from entering the eye?

A

A polarizing lens.

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5
Q

Which of these lenses would you recommend for a skier?

A

A mirrored lens.

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6
Q

What is a prism diopter?

A

The power of a prism to produce a one-centimeter deviation in a ray of light at a distance of one meter.

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7
Q

According to ANSI regulations, what is the prism power tolerance for a complete pair of glasses in the horizontal meridian?

A

.67 prism diopters.

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8
Q

What is decentration?

A

The displacement of the optical center in a lens to create a prismatic effect.

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9
Q

If a client’s pupillary distance is 70 and the frame’s GCD is 76, what is the required decentration in millimeters for each eye?

A

3

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10
Q

When Sally’s glasses arrive from the lab, you discover that the GCD is 66 mm. Sally’s pupillary distance is only 62 mm. Here is her prescription:

OD +1.00 sph

OS +3.00 sph

What is the induced prism in each lens?

A

.2 OD and .6 OS.

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11
Q

In which type of lens aberration will your client see a comet-shaped image?

A

Coma.

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12
Q

When you use Vogel’s formula, you will first need to determine the spherical equivalent of the lens. What is this number?

A

Half the cylinder amount added to the sphere.

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13
Q

What is a slab-off?

A

A process in which the lab cuts off the lower part of the most minus-powered lens on the back side.

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14
Q

Which of these lenses helps prevent aberrations and is a good choice if you want a flat base curve?

A

An aspheric lens.

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15
Q

Which of these is a good rule of thumb when you’re selecting a base curve for a lens?

A

If the difference between lenses is greater than two diopters, it’s better to use the individual base curve selections.

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16
Q

Which of these frames is an optimal choice for a standard progressive lens?

A

Rectangular frames that are not very shallow.

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17
Q

Which of these features will you see in progressive lenses designed for computer use?

A

A larger-than-normal intermediate vision area.

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18
Q

What will you use a centration card for?

A

Determining where the reading portion will fall on a progressive lens and whether a lens will fit in a specific frame.

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19
Q

Which of these is another name for progressive lenses?

A

PALs.

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20
Q

Which of these is an accurate statement about progressive lenses

A

They must be measured very accurately.

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21
Q

What is a mire line?

A

A line you’ll see through the eyepiece of a lensometer.

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22
Q

What does the spectacle table lever of a lensometer do?

A

It raises or lowers the glasses so they’re in the right position.

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23
Q

Which power will you calculate first when you’re using a lensometer to find the power of a lens?

A

The sphere power.

24
Q

What’s one good reason for learning how to use a manual lensometer?

A

Some states require proficiency at this task as part of a practical exam for licensing.

25
Q

What is the first step in using a manual lensometer?

A

Focus the eyepiece.

26
Q

The eyesize of a frame is 50, and the DBL is 20. The person’s PD is 60. How much should the lens be decentered?

A

5 mm

27
Q

If the monocular PD of a right lens is 30, the eyesize is 50, and the DBL is 20, what is the decentration of the lens

A

5 mm

28
Q

If the MRP of a lens needs to be 30 mm, and the frame B measurement is 45, what is the MRP raise?

A

7.5 mm

29
Q

How many millimeters are there in 3.5 centimeters?

A

35 mm

30
Q

how much is 1 centimeter in inches?

A

.394 inches

31
Q

What is the value of x in this equation?

-6 + x = 2

A

8

32
Q

Your client’s prescription is -400 +200 x 80. What numbers do you get when you transpose this prescription?

A

-2.00 -2.00 x 170

33
Q

Mike’s prescription is +2.50 -2.00 x 45. The doctor needs to cut Mike’s astigmatism correction in half. What is the spherical equivalent of this new prescription?

A

+2.00 -1.00 x 45

34
Q

What is x in this problem?

-4.50 + 2.00 = x

A

-2.50

35
Q

If you move a lensometer power wheel from +1.75 to +1.25, which direction are you moving in?

A

Minus

36
Q

What’s wrong with the soft contact lens prescription below?

-2.25 – 2.00 x 01/Acuvue toric/ 8.7/14.2

A

Toric contact lens manufacturers offer cylinder axis options in 10-degree steps, not one-degree steps.

37
Q

What problem does a multifocal contact lens address?

A

Presbyopia

38
Q

Which of these is an accurate statement about selecting contact lenses for clients?

A

A client’s tear consistency plays an important role in selecting the proper lens.

39
Q

What does the oxygen permeability of a lens tell you?

A

How much oxygen can pass through the lens to the eye.

40
Q

What is the purpose of double thin zones in a toric lens?

A

To hold the lenses in the correct orientation.

41
Q

Which of these rigid gas-permeable contact lenses has a central area for near viewing and an outer peripheral area for distance viewing?

A

A progressive aspheric multifocal lens.

42
Q

What should clients do with their rigid contact lenses two or three times a year?

A

Get them polished.

43
Q

What will you use a keratometer for?

A

Measuring a client’s corneal curvature.

44
Q

What will you use fluorescein stain for?

A

Evaluating the fit of a contact lens.

45
Q

The process of removing a rigid contact lens involves pulling on the outer canthus. What is this?

A

It’s the area of skin where the upper and lower eyelids meet.

46
Q

What does the duty to inform refer to?

A

Your legal responsibility to give clients the information they need to make informed decisions.

47
Q

Which of these is a requirement spelled out in ANSIZ87.1?

A

Protective eyewear must be comfortable and not interfere with movement or vision.

48
Q

Which of these rules requires us to give our clients copies of their prescriptions?

A

Eyeglasses I.

49
Q

Which of these organizations sets standards for the safety testing of eyeglass materials and approves and labels materials that pass the testing process?

A

ASTM

50
Q

Which of these lenses must be able to withstand an impact from a quarter-inch steel ball traveling at 1.5 feet per second?

A

A high-impact safety lens.

51
Q

Which of these is an accurate statement about studying for the ABO exam?

A

You should make a list of your weaker areas and focus on these.

52
Q

Which of these is an accurate statement about the ABO exam?

A

Most of the questions are about fitting and dispensing spectacles and ophthalmic lenses.

53
Q

Which of these is a mnemonic device?

A

Roy G Biv.

54
Q

How much continuing education will you need to qualify for a renewed ABO certification?

A

Twelve credit hours.

55
Q

How many questions are there on the ABO exam?

A

125

optitcian (20 decks)

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