POST TEST FOR MODULE 18:  Clinical Optics, Part 2                  Catalog      

Including:
Section 1: Lens Design
Section 2: The Slab-off

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Section 1

1. Lens thickness increases as:

A. lens size increases

B. lens size decreases

C. pantoscopic tilt increases

D. pantoscopic tilt decreases   

2. If the patient's pupil does not line up with the geometric center of the lens cutout in the frame, then:

A. the lens must be decentered

B. a larger lens blank must be used

C. the base curve must be changed

D. A and B                                

3. The frame PD is equal to the:

A. B box plus the DBL

B. A box plus the DBL

C. A box plus the B box

D. A box minus the DBL     

4. The lens decentration needed in a given frame can be calculated by:

A. subtracting the patient's PD from the frame PD

B. adding the patient's PD to the fram PD

C. subtracting the PD from the A box

D. adding the patient PD to the DBL    

5. If you double the longest radius of a lens shape, you have the _____ of the lens.

A. base curve

B. ocular curve

C. effective diameter

D. A box                  

6. Which lens shape would result in the thickest lens for a given prescription?

A. round

B. square

C. oval

D. irregular         

7. A grooved, rimless mounting in a pair of glasses would:

A. add sag value to a plus lens

B. add sag value to a minus lens

C. take away sag value from a plus lens

D. take away sag value from a minus lens        

8. For a given prescription, high index lenses are always lighter than CR-39 (lower index) lenses?

A. True

B. False       

Section 2

9. A slab-off is used to:

A. correct a muscle imbalance

B. increase reading power

C. neutralize unwanted prismatic effect in the reading segment

D. neutralize unwanted prismatic effect in the distance segment     

10. When calculating a slab-off, we are interested in the lens power in the ___ degree meridian.

A. 180

B. 90

C. 45

D. 180 and 90       

11. The formula used for calculating induced prism is the:

A. Prentice Rule

B. Rule of Thirds

C. Rule of Thumb

D. Socratic Method       

12. When using the formula, induced prism = diopter value of the lens, we are assuming that the decentration is equal to:

A. 2 mm

B. 5 mm

C. 10 mm

D. 20 mm      

13. When constructing a power cross of +4.00+2.00x180, what powers will be labeled on our cross?

A. +4.00 and +2.00

B. +4.00 and -2.00

C. +4.00 and +6.00

D. +2.00 and -4.00     

14. For the presciption -3.00-1.00x180, what is the lens power in the 90 degree meridian?

A. -3.00

B. -4.00

C. -1.00

D. -2.00   

15. Which would be a good alternative to a slab-off?

A. patch the better eye

B. patch the eye with the worst vision

C. prescribe distance glasses and reading glasses

D. reduce the lens power in the more plus lens