1
Q
Which of the following is a typical GP lens diameter? 7.80mm 9.60mm 14.2mm 18mm
A
9.60mm
2
Q
A CL with a Dk value of 60 is considered what type of lens? Low Dk Medium Dk High Dk Hyper Dk
A
High Dk
3
Q
Which of the following was the first SCL material? NVP MMA EGDMA HEMA
A
HEMA
4
Q
Which of the following CL material components increases water content, resistance to deposits, Dk, hardness and strength? EGDMA GMA HEMA PVA
A
PVA
5
Q
What are the 2 core components of modern silicone hydrogel lenses?
A
Si-O and MMA
6
Q
Which of the following is a typical combination for most silicone hydrogel lenses? High water and High Dk High water and Low Dk Low water and High Dk Low water and Low Dk
A
Low water and High Dk
7
Q
Which of the following is a typical modern day GP lens material combination? CAB FSA PMMA SA
A
FSA
Note: SA is also a GP lens but an older product and PMMA is a rigid lens
8
Q
Consider a daily wear, high water content (>50%), non-ionic SCL. What FDA group is this lens in? 1 2 3 4
A
2
1 - L - N
2 - H - I
3 - L - N
4 - H - I
9
Q
Consider a modern day GP CL's made from FSA material. By what method is this lens being manufactured? Lathing Molding Spin casting Plasma treatment
A
Lathing
10
Q
Consider a tri-curve GP Lens. Which of the following is the steepest curve in this lens? BCR ICR PCR SCR
A
BCR
11
Q
Consider a tru-curve GP CL. The OAD is 9.60mm. Peripheral curve and secondary curve are both 0.30mm wide. What is the optic zone diameter?
A
8.40mm
12
Q
Consider a tri-curve GP CL. The BCR is 7.80mm. The SCR is 8.80mm. What is the appropriate blend radius between BCR and SCR?
- 80mm
- 10mm
- 30mm
- 60mm
A
8.30
13
Q
What is a typical center of thickness of GP lenses? .10um .20um 1.30um 7.80um
A
.20um
14
Q
Increasing center of thickness in a plus power GP lens will \_\_\_\_\_\_\_? Not affect the lens position Move the center of gravity backwards Increase lens flexure Cause the lens to center low
A
Cause the lens to center low
15
Q
Which of the following is the single most important factor in GP lens design? Edge design Material Thickness Diameter
A
Edge design
16
Q
Consider evaluating the amount of fluorescein under the edge of a GP lens on the pts. eye. What is that called? Axial edge lift Radial edge lift Apical clearance Edge clearance
A
Edge clearance
17
Q
Which of the following is an option to reduce the edge thickness in a high minus power GP lens? Decrease OAD Minus carrier Increase diameter Increase center thickness
A
Decrease OAD
18
Q
Which of the following is an option to increase the edge thickness in a high plus power GP lens? Decrease OAD Minus Carrier Plus Carrier Decrease center thickness
A
Minus carrier
