Deck 2: Instrumentation

Question 1

During a lensometer examination, if the examiner is severely astigmatic, they should:

A)Wear their glasses
B)Adjust the instrument's reticle
C)Center the mires
D)Stay away from the lensometer

Answer 1

Wear their glasses

Question 2

What does it mean when the mires cannot be centered in the lensometer?

A)The stage must be move up
B)The stage must be moved down
C)The lens prism has been ground into the lens
D)The power dial needs to be rotated

Answer 2

The lens prism has been ground into the lens

Question 3

Which is a handheld instrument that measures the surface power of a spectacle lens in diopters?

A)Keratometer
B)Lensometer
C)Geneva Lens Clock
D)Tonometer

Answer 3

Geneva Lens Clock

Question 4

Vertex distance can be measured with a:

A)Cross cylinder
B)PAM
C)Distometer
D)Pinhole disc

Question 5

Which answer below can be measured by a lensometer?

A)Prism in the lens
B)The center of the lens
C)Add power of the lens
D)Prescription in the lens
E)All of the above

Question 6

Vertical and horizontal prism is measured in a lensometer by:

A)The intersection of the mires in the lensometer is offset both vertically and horizontally from the center of the grid
B)Making sure that both lenses have the same prism
C)None of the above

Question 7

Do you read the cylinder power first or the sphere power first in a lensometer?

A)Cylinder power
B)Sphere power

Question 8

You can use the lensometer to help find the pupillary distance of the lenses.

Question 9

A lensometer can read up to how many diopters of prism without using additional prism rings?

A)Three
B)Six
C)Five

Question 10

Which instrument measures the curvature of the surface of a lens? Choose all that apply.

A)Lens clock
B)Lensometer
C)Spherometer
D)None of the above

Question 11

What measures the thickness of a lens up to 19 mm?

A)A lens clock instrument
B)A lens thickness caliper instrument
C)A PD ruler

Question 12

The first step in using a lensometer to check glasses is to?

A)Mount the glasses on the lens stage
B)Power calibrate the eye piece for you
C)Turn the power drum to the highest plus power

Question 13

If you have the following prescription, how would you use the lensometer to read it in minus cylinder?
Prescription: -2.00 +3.00 X 65

A)First transpose the power. Put the axis adjustment wheel on 180, turn the power drum far into the plus powers and begin to turn back toward you to find the sphere power at -1.00, then on to find cylinder power at +3.00
B)First transpose the power. Put the axis adjustment wheel on 155, turn the power drum far into the plus powers and begin to slowly turn the wheel back toward you to find the sphere power at +1.00, then on to find cylinder power at -2.00. The difference between the +1.00 and the -2.00 is -3.00

Question 14

Is it necessary to verify the intermediary section of a trifocal in the lensometer?

Question 15

What is another word for a lens clock?

A)A base curve checker
B)A caliper
C)A spherometer

Question 16

You would need to set a pupilometer to which setting to get the patient's PD for 16 inches?

A)35 cm
B)45 cm
C)40 cm

Question 17

Which feature(s) is(are) best to have in a pair of pliers to make sure you won't damage a frame's finish when adjusting? Choose all that apply.

A)They should be made of titanium
B)They should have a protective plastic jaw
C)They should be lightweight
D)They should have rubberized handles

Question 18

Angling pliers are used to:

A)Adjust the nose pads
B)Adjust for panoscopic angle adjustments
C)Adjust for temple curvature

Question 19

A distometer measures the distance between the eyes.

Question 20

Hot air warmers should not be used for which frame types?

A)Metal
B)Plastic
C)SPX
D)Both A and C

Question 21

What is a lens box used for?

A)It is used with the trial sets of lenses the doctors use to determine a prescription
B)It is used as a donation box for charity
C)It is used as a measuring device for a lens' height and width

Question 22

What does a millimeter lens sizer tool do?

A)It measures the circumference of the lens
B)It determines the blank size to use for the lab
C)It determines the A and B measurements of the lens

Question 23

What does a remote tracer do?

A)Decrease the turnaround time from the lab
B)Allow storage of the exact measurements of the lens in a computer
C)Increase the accuracy of the measurements over using the box method
D)All of the above

Question 24

How can you check a lens clock to make sure it is still calibrated correctly?

A)Send it to the lab and have them check it
B)Place all three points of the clock on a flat surface, depress until all points touch. The dial should read zero.
C)Test against the base curve of a lens you already know to be accurate to see if it is the same

Question 25

Which is not something on a lensometer that requires maintenance?

A)The ink well
B)Calibration
C)The nose rest
D)The marker needle

Question 26

Screwdriver tips can be replaced when they are damaged or worn.

Question 27

An ultrasonic cleaner is used to?

A)Spray on lenses to clean them
B)Clean patients' frames and lenses
C)Clean instruments

Question 28

Vertex distance is measured by using which tool?

A)Pupilometer
B)PD ruler
C)Distometer

Question 29

What does a pupilometer measure?

A)The size of the pupils
B)The distance between the pupils
C)The height of the pupils
D)None of the above

Question 30

What does a PD ruler not measure?

A)Vertex distance
B)The B measurement of a frame
C)The pupillary distance of a patient
D)The ED measurement of a frame

Question 31

Axis pliers are used to:

A)Adjust the temple curve
B)Turn the axis of a lens in a frame
C)Give the frame more panoscopic tilt

Question 32

Frames with delicate finishes are best adjusted at the end pieces by using:

A)Nose pad pliers
B)Snipe nosed pliers
C)Angling pliers
D)Double nylon jaw pliers
E)None of the above