Quiz 4

Question 1

Prism ballast, double slab-off and peri-ballast are all used for what type of lens design?

a. Spherical
b. Therapeutic
c. Soft toric
d. RGP bitoric

Answer 1

c. Soft toric

Question 2

When fitting a rigid back surface toric, approximately ______% of the corneal toricity may be placed on the posterior lens surface.

a. 33
b. 50
c. 25
d. 66

Answer 2

d. 66

Question 3

Which of the following lens designs would not provide a good visual result for this patient?

K’s 44.00 @180 / 42.50 @090
Rx -3.50 -1.50 x090

a. Spherical RGP
b. Aspheric RPG
c. Soft spherical lens
d. Soft toric lens

Answer 3

c. Soft spherical lens

Question 4

_______ is a multi-zone concentric soft bifocal contact lens.

a. Unilens
b. Tangent Streak
c. Acuvue Bifocal
d. B&L Occasions

Answer 4

c. Acuvue Bifocal

Question 5

A bifocal lens in which the power gradually changes from the central area of the lens to the periphery is known as:

a. An aspheric lens
b. A monocentric lens
c. A crescent lens
d. A bitoric lens

Answer 5

a. An aspheric lens

Question 6

Which of the following is a translating bifocal lens design?

a. Diffractive
b. Segmented
c. Aspheric
d. Concentric

Answer 6

b. Segmented

Question 7

Given the following Rx: OD -2.00 -2.00 x110
If the diagnostic toric soft lens rotates 15 degrees clockwise, what lens axis should be ordered?

a. 140
b. 125
c. 95
d. 110

Answer 7

b. 125

Question 8

During the diagnostic evaluation of the following patient, the lens rotates 10 degrees to the left. Which of the following lens parameters would you order for the patient?

Patient’s refraction -2.50 -1.00 x170
Diagnostic lens 8.7 -2.50 -1.00 x170

a. 8.7 -2.50 -1.00 x010
b. 8.7 -2.50 -1.00 x180
c. 8.7 -2.50 -1.00 x170
d. 8.7 -2.50 -1.00 x160

Answer 8

b. 8.7 -2.50 -1.00 x180

Question 9

A prism ballast RGP lens requires how much prism for proper orientation?

a. 2.00 to 4.00D
b. 0.25 to 0.50D
c. 1.50 to 3.00D
d. 0.75 to 1.50D

Answer 9

d. 0.75 to 1.50D

Question 10

What presbyopic lens design would you recommend for a patient with the following Rx and K’s readings?

OD -1.00 -1.50 x180 | 42.50 / 44.00 @090
OS -0.50 -1.00 x010 | 41.75 / 42.75 @100
ADD +2.50 OU

a. Soft concentric
b. RGP aspheric
c. Spherical soft monovision
d. RGP translating

Answer 10

d. RGP translating