Quiz 1

Question 1

Which of the following modifications cannot be performed on a rigid contact lens?

a. Blend Transition Zone
b. Reduce Optical Zone Diameter
c. Flatten Secondary Curve
d. Steepen Peripheral Curves

Answer 1

d. Steepen Peripheral Curves

Question 2

A Marco Radiuscope measures the base curve of a lens in increments of:

a. 0.02mm
b. 0.20mm
c. 0.01mm
d. 0.12 diopters

Answer 2

c. 0.01mm

Question 3

The Dioptric Power of a lens is measured by a _____ .

a. Ophthalmometer
b. Lensmeter
c. Spherometer
d. Radiuscope

Answer 3

b. Lensmeter

Question 4

In order to effect a smooth blend on a contact lens which has a 10.50mm PPC and a 7.50mm CPC, one would use which of the following tools (with .4mm soft pad)?

a. 9.40mm
b. 8.60mm
c. 10.10mm
d. 8.00mm

Answer 4

b. 8.60mm

Question 5

Name an adjustment that usually requires a new lens.

a. Reducing the diameter
b. Changing the base curve
c. Reducing the optical zone
d. Remaking the peripheral curve

Answer 5

b. Changing the base curve

Question 6

All contact lens modifications tend to _____ the lens fit.

a. Destroy
b. Loosen
c. Have no effect on
d. Tighten

Answer 6

b. Loosen

Question 7

The Ansi tolerance for contact lens thickness is:

a. 0.02mm
b. 0.5mm
c. 0.05mm
d. 0.2mm

Answer 7

a. 0.02mm

Question 8

Which of the following polishing compounds should not be used with a gas permeable lenses?

a. X-pal
b. Silvo
c. Sil 02 Care
d. Alox PG

Answer 8

b.Silvo

Question 9

The diameter of a rigid contact lens can be reduced by all of the following except:

a. Pitch Technique
b. Conical Stone
c. Razor Blase Technique
d. File Technique

Answer 9

a. Pitch Technique

Question 10

If the Mires of a Radiuscope are not in focus in all meridians indicates:

a. Poor edge
b. Warpage
c. Poor blends
d. Excessive thickness

Answer 10

b. Warpage