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Contact Lens - Quizzes > Quiz 3 > Flashcards

Quiz 3 Flashcards

1
Q 
Which of the following is a typical GP lens diameter?
7.80mm
9.60mm
14.2mm
18mm
A

9.60mm

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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

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3
Q 
Which of the following was the first SCL material?
NVP
MMA
EGDMA
HEMA
A

HEMA

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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

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5
Q

What are the 2 core components of modern silicone hydrogel lenses?

A

Si-O and MMA

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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

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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

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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

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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

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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

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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

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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?

  1. 80mm
  2. 10mm
  3. 30mm
  4. 60mm
A

8.30

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13
Q 
What is a typical center of thickness of GP lenses?
.10um
.20um
1.30um
7.80um
A

.20um

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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

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15
Q 
Which of the following is the single most important factor in GP lens design?
Edge design
Material
Thickness
Diameter
A

Edge design

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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

Contact Lens - Quizzes (11 decks)

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