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| 1. Even the best lens producing process |
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A.
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can make any design better |
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B.
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cannot deliver performance in the absence of good design |
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C.
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cannot deliver a good design |
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D.
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A & C |
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| 2. All of the following are progressive lens design foundations except |
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A.
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binocularity |
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B.
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sharp central focus |
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C.
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natural reading posture |
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D.
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proper distance zone placement |
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| 3. A more comfortable reading posture requires ______________ downward eye rotation |
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A.
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less than 25 degrees |
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B.
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less than 10 degrees |
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C.
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more than 25 degrees |
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D.
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about 35 degrees |
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| 4. Proper near zone placement requires knowledge of |
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A.
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central focus displacement |
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B.
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focal length of the add |
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C.
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Rx prismatic effects |
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D.
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B & C |
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| 5. Central focus can be made sharper by |
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A.
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correcting for the effects of higher order aberrations |
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B.
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adding prism |
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C.
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increasing distance power by -0.25D |
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D.
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all of the above |
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| 6. All of the following are limitations of traditional surfacing except |
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A.
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polishing requires physical tools |
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B.
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tools are rounded for power |
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C.
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while fining can be done on convex surfaces, polishing cannot |
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D.
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designs cannot be added to the rear lens surface |
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| 7. The processing technique ______________, can store millions of design files, then be modified by patient data. |
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A.
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digital downloads |
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B.
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digital surfacing |
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C.
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concave spherical surfacing |
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D.
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computer translation |
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| 8. A customized design __________________________. |
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A.
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is always better than the original design |
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B.
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is worse than the original design |
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C.
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cannot be quantified |
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D.
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is only better if customized meaningfully |
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| 9. Increased precision, in digital surfacing, means distance power may be accurate to ______. |
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A.
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0.06D |
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B.
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0.01D |
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C.
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0.12D |
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D.
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0.10D |
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| 10. Traditional progressives have their design |
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A.
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on the lens front surface |
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B.
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on the lens back surface |
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C.
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either the front or the back |
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D.
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all of the above |
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| 11. In DRx processing, the designs are located |
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A.
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on the lens' front surface |
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B.
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on the lens' back surface |
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C.
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either the front or the back |
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D.
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all of the above |
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| 12. All of the following are true about adding design to both lens surfaces except |
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A.
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the resulting design is always better |
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B.
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design flexibility is increased |
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C.
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more design solutions are possible |
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D.
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simultaneously control focus and distortion |
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| 13. A front surface +2.50D add progressive lens creates ___________ because the change in front curvature is directly linked to the change in dioptric power. |
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A.
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focus error |
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B.
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blur |
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C.
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distortion |
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D.
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all of the above |
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| 14. By disassociating the _____________ from the curvature change, ___________ can be reduced below the levels found in single surface progressives. |
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A.
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power change/distortion |
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B.
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power error/ distortion |
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C.
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distortion/power error |
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D.
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add power/power error |
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| 15. A back surface +2.50D add progressive lens creates ___________ instead of having no change in front base curve, top to bottom |
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A.
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focus error |
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B.
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blur |
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C.
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distortion |
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D.
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all of the above |
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| 16. Asphericity is a tool to reduce |
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A.
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marginal astigmatism |
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B.
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power error |
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C.
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distortion |
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D.
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A & B |
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| 17. Digital surfacing does all of the following except |
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A.
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designers can use both sides of the lens |
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B.
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limits the designer to a full back surface format |
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C.
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removes tooling limitations |
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D.
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has the potential for greater precision |
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| 18. Further customization of digitally surfaced may include |
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A.
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personalization by head/eye turning ratios |
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B.
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position of wear |
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C.
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distance atoricity |
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D.
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all of the above |
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| 19. Personalization to lens position includes consideration of |
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A.
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vertex distance |
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B.
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lens tilt effects |
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C.
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wrap angle effects |
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D.
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all of the above |
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| 20. The formats available using digital surfacing are: |
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A.
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a single back surface combining design and Rx |
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B.
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using 2 surfaces to create the design |
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C.
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a single front surface design with Rx on the back |
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D.
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A & B |
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