NOCE Dispensing Instrumentation Questions and Answers

Question 1

An optician uses a lens clock to measure the front surface of a lens and gets a reading of +6.50 D.
The back surface measures -6.00 D in one meridian and -8.00 D in the perpendicular meridian.
Assuming the lens clock is calibrated for the lens material, what is the nominal power of this lens?

Accepted Answer

+0.50 -2.00 x 180

Answer

+0.50 -2.00 x 090

Answer

-1.50 +2.00 x 090

Answer

-1.50 -2.00 x 180

Question 2

When using a manual lensometer, if the sphere lines come into focus at +2.00 D and the cylinder lines come into focus at +3.50 D, and the axis wheel is set to 045, what is the correct prescription in plus-cylinder format?

Accepted Answer

+2.00 +1.50 x 045

Answer

+3.50 -1.50 x 135

Answer

+2.00 -1.50 x 135

Answer

+3.50 +1.50 x 045

Question 3

A dispenser is fitting a patient with a new frame and needs to adjust the pantoscopic tilt. Which of the following tools is specifically designed for gripping the endpiece and temple to make this adjustment without damaging the frame?

Accepted Answer

Wide jaw angling pliers

Answer

Nose pad adjusting pliers

Answer

Lens thickness calipers

Answer

Chassis punch

Question 4

Which instrument is used to verify the base curve of a finished lens and can also detect surface warpage?

Accepted Answer

Lens Clock (Spherometer)

Answer

Distometer

Answer

Pupillometer

Answer

Polariscope

Question 5

A patient is being measured for single vision near glasses for reading at 40 cm. To ensure the optical centers are correctly placed for convergence, what setting should be adjusted on the corneal reflex pupillometer?

Accepted Answer

The vertex distance should be set to zero.

Answer

The occluder should be used for monocular readings only.

Answer

The forehead bar should be removed.

Answer

The measurement dial should be set to 40 cm.

Question 6

To make a plastic frame more pliable for an adjustment, an optician would use a frame warmer. What is the primary material used as the heating medium in most common optical frame warmers?

Accepted Answer

Forced hot air

Answer

Hot water

Answer

Infrared light

Answer

Salt or glass beads

An optician uses a lens clock to measure the front surface of a lens and gets a reading of +6.50 D.The back surface measures -6.00 D in one meridian and -8.00 D in the perpendicular meridian.Assuming the lens clock is calibrated for the lens material, what is the nominal power of this lens?

An optician uses a lens clock to measure the front surface of a lens and gets a reading of +6.50 D.
The back surface measures -6.00 D in one meridian and -8.00 D in the perpendicular meridian.
Assuming the lens clock is calibrated for the lens material, what is the nominal power of this lens?