Quiz 4 Flashcards
1
Q
Consider the power of a CL stated on the manufacturer's lens pack. Which of the following is expressed there? FVP BVP Equivalent power Back surface power
A
BVP
2
Q
The power of a CL is stated with +2.00D. Three of the following are about this value, but which is considerably different? FVP BVP Equivalent power Back surface power
A
Back surface power
3
Q
The Rx at the corneal plane is -5.25D. A GP lens is fitted 0.50D steeper than Flat-K. What is the appropriate lens power?
- 4.75
- 5.00
- 5.75
- 6.00
A
-5.75
Steeper=More minus
4
Q
The Rx at the corneal plane is +2.00D. A GP lens is fitted 0.10mm flatter than Flat K. What is the appropriate lens power? \+2.50 \+2.25 \+2.00 \+1.75
A
+2.50
Flatter = More plus
5
Q
The BCR of a GP lens is changed from 7.80mm to 7.90mm. How is the lens power adjusted, in order to maintain the in-situ refraction? -1.00 -0.50 \+0.50 \+1.00
A
+0.50
Note: Since it is flatter you will have to add more plus and every 0.10mm is equal to 0.50D
6
Q
The Rx at the corneal plane is -1.50 -1.00 x 090. The K readings are 43.00 090/43.75 180. The GP lens has a BCR of 7.85mm. What is the appropriate lens power?
- 2.50
- 2.00
- 1.50
- 1.00
A
-1.50
7
Q
The Rx at the corneal plane is -6.00D. The K readings are 45.00 180/ 45.00 090. The Soft lens has a BCR of 8.60mm. What is the appropriate lens power?
- 7.50
- 6.00
- 4.50
- 2.50
A
-6.00
8
Q
The Rx at the corneal plane is -1.50 -1.00 x 180. The K readings are 43.00 180/ 43.75 090. A GP lens is placed on the eye. What is the expected residual astigmatism? -1.00 -0.50 -0.25 Plano
A
-0.25
9
Q
The Rx at the corneal plane is -1.50 -1.00 x 180. The K readings are 43.00 180/43.75 090. A spherical soft lens is place on the eye. What is the expected residual astigmatism? -1.00 -0.50 -0.25 Plano
A
-1.00
10
Q
The Rx at the corneal plane is -1.50 -1.00 x 180. The K readings are 43.00 180/ 43.50 090. What is the internal astigmatism?
- 0.50 x 090
- 0.50 x 180
- 0.25 x 180
- 0.25 x 090
A
-0.50 x 180
