Quiz - Lens Fitting, Design and Changes

Question 1

Patient CL Rx BC 45.00 -4.00 9.2 diameter
At follow up visual acuity is 20/20. Slip lamp exam you determine lens needs to be changed to BC 45.50. What power lens would you order?

a. -4.25
b. -3.50
c. -4.50
d. -4.00

Answer 1

c. -4.50

Question 2

If Rx lens axis was 170 and trial soft toric lens rotated clockwise 15 degrees. What lens axis should be ordered?

a. 155
b. 175
c. 015
d. 005

Answer 2

d. 005

Question 3

To help reduce flare issues reported by patient you would

a. Reduce diameter
b. Decrease optical zone size
c. Steepen BC
d. Increase optical zone size

Answer 3

d. Increase optical zone size

Question 4

Patient Rx -1.00 -2.25 x170 K readings 44.00 / 44.75 @090

Choose best lens design for patient to provide visual acuity

a. RGP sphere
b. Soft sphere
c. Bi toric
d. Soft toric

Answer 4

d. Soft toric

Question 5

What lens has the greatest vault/sag?

a. 8.3 14.0
b. 8.6 14.5
c. 8.9 14.5
d. 8.3 14.5

Answer 5

d. 8.3 14.5

Question 6

Lens is ordered with a BC of 7.18. If BC is changed to 0.50 flatter what would new base curve be?

a. 7.68
b. 6.68
c. 7.26
d. 7.11

Answer 6

c. 7.26

Question 7

Patient Rx -1.00 -2.25 x170 K readings 44.00/44.25 @090

a. Soft spherical
b. RGP spherical
c. Bi-toric
d. Front surface RGP

Answer 7

d. Front surface RGP

Question 8

K readings are 42.50/42.00 x090. What type of astigmatism?

a. Oblique
b. Irregular
c. ATR
d. WTR

Answer 8

c. ATR