Optical Tools and Standard Alignment

Question 1

What is the name of the tool/instrument used to measure vertex distance?

Answer 1

Distometer

Question 2

What is the name of the tool/instrument used to measure center thickness of a lens?

Answer 2

Caliper

Question 3

What is the name of the tool/instrument used to check for heat tempering?

Answer 3

Polariscope

Question 4

What is the name of the tool/instrument used to measure the surface power of a lens?

Answer 4

Lens clock

Question 5

If a lens is being measured for surface power and the instrument is calibrated to an index of refraction of 1.530, and the lens material has an index of refraction of 1.60, what will happen?

Answer 5

The power read will be too low

Question 6

If a lens is being measured for surface power and the instrument is calibrated to an index of refraction of 1.530, and the lens material has an index of refraction of 1.49, what will happen?

Answer 6

the power read will be too high

Question 7

The distometer is used by doing what?

Answer 7

Have the patient close their eye. Place the flat end of the distometer against the closed lid and extend the arm of the distometer until it touches the back surface of the lens. Record the measurement.

Question 8

A circumference gauge is used to do which of the following?
a.) Measure the exact sizing of a lens circumference
b.) by offices that utilize remote-tracing instruments
c.) When ordering one lens only
d.) Accurate to within 1/10th of a mm
e.) All of the above

Answer 8

All of the above

Question 9

If using a lens clock and you get one reading on the front surface of the lens and two readings on the back surface of the lens, what can you conclude about the lens?

Answer 9

The lens is compound, containing one spherical surface and one toric surface

Question 10

What is the name of the tool/instrument used to determine the amount of slab-off in a lens?

Answer 10

Lens clock