Quiz 9

Question 1

Which of the following is an exclusively qualitative tear test?

a. Phenol Red Thread Test
b. Schirmer 1 Test
c. Schirmer 2 Test
d. Tear Ferning Test
e. Tear Meniscus Height

Answer 1

Tear Ferning Test

Question 2

According to the Rolando classification, how would the absence of ferns with clusters and threads of mucus be classified?
Type A
Type F
Type 1
Type 4

Answer 2

Type 4

Question 3

Which of the following known components is not present in a tear ferning pattern (fern)?
Chloride
Protein
Potassium
Sodium

Answer 3

Protein

Question 4

What is the sensitivity of the tear ferning test for Sjogrens syndrome?
10 to 20%
50 to 60%
80 to 90%
100%

Answer 4

80 to 90%

Question 5

When evaluating a pt complaining about dry eye, you evaluate the tear interference pattern with a slitlamp. Finding an open meshwork pattern, what lipid layer thickness do you conclude?
20um
20 to 80um
100um
20nm
300nm

Answer 5

20 nm

Note: This test measure your lipid layer
Meshwork - 15 to 30nm
Flow pattern - 30 to 80nm
Amorphous - 80nm
Color Fringe - >80 to 370nm

Question 6

Pts blink rate is 12 per minute. Based on this information alone, what CL option of the following - if any- do you suggest?

a. Daily disposable Si-Hy lens
b. Low water content hydrogel lens
c. PMMA contact lens
d. Severe dry eye - no contact lens

Answer 6

Daily disposable Si-Hy lens

Question 7

You recently switched your pt from hydrogel lenses to SiHy lenses. Now you pt complains about some discomfort. What is the likely reason?

a. Corneal reaction to the increased oxygen
b. A corneal reaction to the decreased oxygen
c. High Modulus
d. Low Modulus

Answer 7

c. High modulus

Question 8

Your pt is wearing a toric soft lens and the marking is at 6. What axis adjustment do you preform at the final lens?

a. add 10 degrees
b. No adjustment
c. Subtract 10 degrees
d. Subtract 90 degrees

Answer 8

b. No adjustment

Question 9

Your pt is wearing a toric soft lens and the marking is at 6.5 (in between 7 and 6 o’clock). What axis adjustment do you preform at the final lens?

a. add 5 degrees
b. No adjustment
c. Subtract 15 degrees
d. add 15 degrees

Answer 9

d. Add 15 degrees

Question 10

Your pts. Rx:
OD: -3.00 -1.25 x 160
You fit a diagnostic lens -3.00-1.25 x 160. The lens mark rotates 10 degrees to your left. What lens do you order?
a. -3.00-1.25 x150
b. -3.00 -1.25 x 160
c. -3.00 -1.25 x 170
d. -3.00 -1.25 x 180

Answer 10

c. -3.00 -1.25 x 170

Question 11

Your pts. Rx is OD: -3.00 -1.25 x 160. You fit a diagnostic lens -3.00 -1.25 x 180. The lens mark stabilizes halfway between the 5 and 6 o’clock positions. What lens do you order?

a. -3.00-1.25 x015
b. -3.00 -1.25 x 145
c. -3.00 -1.25 x 165
d. -3.00 -1.25 x 175

Answer 11

b. -3.00 -1.25 x 145

Question 12

Which of the following is not a stabilization method utilized for toric soft lenses?
Aspheric surface
Prism ballast
Peri-ballast
Truncation

Answer 12

Aspheric surface

Question 13

Which of the following stabilization methods induces prism at the optic zone?
Double slab off
Peri ballast
Prism ballast
Reverse prism

Answer 13

Prism ballast

Question 14

Consider a toric soft lens utilizing prism ballast stabilization. Which if the following contributes most to lens stablization?

a. Gravity
b. Lid force upon blink
c. The aspheric periphery
d. The toric back surface

Answer 14

Lide force upon blink

Question 15

Consider a toric soft lens utilizing prism ballast. What is the appropriate amount of prism?

0. 50PD
1. 50PD
2. 00PD
3. 00PD

Answer 15

1.50PD

Question 16

Consider a minus power toric soft lens utilizing prism ballast. Where - if at all- will the oxygen transmissibility least?
Inferiorly
Nasally
Superiorly
Temporally

Answer 16

Inferiorly

Question 17

Your pts. Rx is -3.00-3.00x180. A soft toric lens -3.00-3.00 x 180 rotates 10 degrees to the right. How much astigmatism do you expect to find in the over-refraction?

a. -0.50DC
b. -1.00DC
c. -1.50DC
d. -2.00DC
e. -2.50DC
f. -3.00DC

Answer 17

-1.00DC