CE Test Questions
Prism Thinning and Progressive Addition Lenses

Exam Questions
1. “Yoked” prism __________________________________.

    A. deviates light equally in the same direction
    B. deviates light equally in opposite directions
    C. causes diplopia
    D. both B & C
2. Prism thinning is usually ____________________________.

    A. prescribed by the refractionist as part of the patient's Rx
    B. used to challenge an extra-ocular muscles
    C. calculated at the laboratory
    D. applied to glass lenses only
3. The primary purpose of prism thinning is ______________________.

    A. to reduce differences in thickness between the left and right lens
    B. to reduce differences in thickness between the top and bottom of the lens
    C. to reduce the overall thickness and weight of the lens
    D. both B & C
4. The curvature of a progressive power lens _________________ towards the bottom of the lens.

    A. increases
    B. decreases
    C. remains stable
    D. may either decrease or increase
5. Which of the following statements regarding this prescription are true? OU -1.00 sph ADD +2.00

    A. the combined near power is +2.00 diopters
    B. the combined near power is +1.00 diopters
    C. the combined near power is plano
    D. the combined near power is -1.00 diopters
6. What factors are generally taken into account when determining if prism thinning will be applied?

    A. the location of the Primary Reference Point (PRP)
    B. the combined near power of the lens
    C. the relative thickness of the top and bottom of the lens
    D. all of the above
7. The “datum line” is a _______________________________________.

    A. horizontal line passing through the geometric center of the lens
    B. vertical line passing through the geometric center of the lens
    C. equivalent to the ED measurement of the frame
    D. both B & C
8. Prism thinning may not be applied by some LMS (Lab Management Systems) if the PRP ____________________________.

    A. is located above the datum line
    B. is located on the datum line
    C. is located below the datum line
    D. both A & B
9. Most patients ___________________________ changes in prism thinning.

    A. are extremely sensitive to
    B. will notice some effect with
    C. will adapt over time to
    D. will not notice
10. A patient who is sensitive to the addition of prism thinning may report ___________________.

    A. feeling like he “is walking uphill all the time”
    B. feeling like he “is walking downhill all the time”
    C. blurred distance vision
    D. diplopia (double-vision)
11. A patient who is used to prism thinning may notice its absence in future eyewear by reporting ____________________________.

    A. a feeling like he “is walking uphill all the time”
    B. a feeling like he “is walking downhill all the time”
    C. a feeling the reading area is lower in the frame
    D. diplopia (double-vision)
12. Generally speaking, the amount of prism thinning usually applied is _____________________.

    A. equal to 1/3 the ADD power
    B. equal to ½ the ADD power
    C. equal to 2/3 the ADD power
    D. equal to the ADD power
13. Generally speaking, the maximum amount of prism thinning applied should be ____________.

    A. 1.00 diopter
    B. 1.50 diopter
    C. 2.00 diopter
    D. 2.50 diopter
14. Prism thinning should be measured at the _________________.

    A. fitting cross
    B. near verification circle
    C. distance verification circle
    D. PRP (Primary Reference Point)
15. Unless Rx prism has been ordered, the amount of prism at the PRP of should be ___________.

    A. the same in both lenses
    B. 4.00 diopters base up in both lenses
    C. 4.00 diopters base down in both lenses
    D. in equal amounts but opposite directions in each lens
16. When looking through a prism, the eye will rotate towards the _____________.

    A. base of the prism
    B. apex of the prism
    C. mid-point of the prism
    D. optical center of the prism
17. Prism thinning is generally considered to be a ________________ element of the eyewear.

    A. refractive
    B. cosmetic
    C. prescribed
    D. undesirable
18. Which of the following Rxs is most likely to have prism thinning applied?

    A. OU -3.50 sph ADD +1.00
    B. OU -3.50 sph ADD +3.00
    C. OU -1.50 sph ADD +1.00
    D. OU -1.50 sph ADD +3.00
19. If a patient appears to be sensitive to a change in prism thinning, the eyewear should be _______________________.

    A. reordered with a lower fitting height
    B. reordered with a higher fitting height
    C. reordered with prism thinning equal to the previous pair
    D. reordered with prism thinning greater than the previous pair
20. The PRP is located ____________________________.

    A. mid-way between the engraved circles on the PAL
    B. 4mm above the engraved circles on the PAL
    C. at the fitting cross
    D. 2.5mm inset from the fitting cross

Evaluation Questions

21. In questions 21-25 please rate the effectiveness of how well each course met the stated learning objectives: Met the stated learning objectives?

    A. Excellent
    B. Very Good
    C. Good
    D. Fair
    E. Poor
22. Related to your practice needs?

    A. Excellent
    B. Very Good
    C. Good
    D. Fair
    E. Poor
23. Will help you improve patient care?

    A. Excellent
    B. Very Good
    C. Good
    D. Fair
    E. Poor
24. Avoided commercial bias/influence?

    A. Excellent
    B. Very Good
    C. Good
    D. Fair
    E. Poor
25. How would you rate the overall quality of the material presented?

    A. Excellent
    B. Very Good
    C. Good
    D. Fair
    E. Poor
26. Would you like to receive an Ohio Certificate in addition to ABO?

    A. Yes
    B. No
27. Comments on this program: