프리즘신닝과 누진가입도렌즈 자기평가시험 |
Prism Thinning and progressive Addition Lenses Self-Assessment Examination 1.“Yoked” prism: a. deviates light equally in the same direction b. deviates light equally in opposite direction 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 extra-ocular muscle c. calculated at the laboratory d. applied to glass lenses only 3. Prism thinning: a. reduces differences in thickness between the left and right lens b. reduces differences in thickness between the top and bottom of the lens c. reduces the overall thickness and weghit of the lens d. both B&C 4. The curvature of a progressive power lens ______________ toward the bottom of lens. a. increases b. decreases c. remains stable d. may either decreases or increases 5. Which of the following statements regarding this prescription are ture? 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 Lab Management System 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 down-hill 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 down-hill 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 1/2 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 |