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| 1. According to optical design principles, each prescription power ideally requires a unique: |
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A.
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Base curve or aspheric design |
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B.
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Lens tint or coating |
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C.
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Center thickness |
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D.
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None of the above |
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| 2. Tilting a spherical spectacle lens introduces the following prescription power changes: |
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A.
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Increase in sphere power |
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B.
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Induced cylinder power |
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C.
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Both A and B |
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D.
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Neither A nor B |
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| 3. Progressive lenses customized using free-form surfaces first began to appear in the: |
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A.
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1970s |
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B.
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1980s |
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C.
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1990s |
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D.
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2000s |
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| 4. Which of the following terms does not refer to the production of complex lens surfaces using a free-form generator: |
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A.
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Traditional surfacing |
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B.
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Direct surfacing |
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C.
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Digital surfacing |
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D.
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Free-form surfacing |
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| 5. Position of wear measurements include all of the following, except: |
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A.
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Vertex distance |
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B.
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Fitting height |
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C.
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Pantoscopic tilt |
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D.
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Facial wrap |
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| 6. Optically optimizing a progressive lens design using the wearer's specific prescription requirements represents: |
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A.
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Customization for the prescription |
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B.
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Customization for the frame size or fitting height |
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C.
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Customization for the position of wear |
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D.
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None of the above |
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| 7. Optically optimizing a progressive lens design using the wearer's specific fitting geometry represents: |
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A.
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Customization for the prescription |
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B.
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Customization for the frame size or fitting height |
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C.
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Customization for the position of wear |
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D.
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All of the above |
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| 8. Manipulating the corridor length of a progressive lens design based upon the wearer's selected frame size or fitting height represents: |
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A.
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Customization for the prescription |
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B.
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Customization for the frame size |
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C.
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Customization for the position of wear |
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D.
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All of the above |
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| 9. This is a type of free-form progressive lens that splits the addition power between the front and back surfaces of the lens: |
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A.
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Enhanced semi-finished lens |
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B.
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Dual-surface lens |
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C.
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Back-surface lens |
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D.
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None of the above |
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| 10. This is a type of free-form progressive lens that employs a factory-molded, semi-finished progressive lens blank for the front surface: |
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A.
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Enhanced semi-finished lens |
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B.
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Dual-surface lens |
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C.
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Back-surface lens |
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D.
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None of the above |
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| 11. This is a type of free-form progressive lens that has all of the progressive optics directly surfaced onto the lens blank: |
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A.
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Enhanced semi-finished lens |
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B.
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Dual-surface lens |
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C.
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Back-surface lens |
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D.
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None of the above |
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| 12. A compensated prescription is supplied for certain free-form progressive lenses in order for eye care professionals to: |
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A.
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Verify the prescription using a standard focimeter |
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B.
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Verify the prescription in the position of wear |
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C.
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Verify the prescription using a lens clock |
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D.
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None of the above |
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| 13. As the corridor length of a progressive lens design increases: |
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A.
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The peripheral astigmatism increases more rapidly |
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B.
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The viewing zones become more narrow |
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C.
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The viewing zones become wider |
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D.
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The progressive corridor becomes smaller |
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| 14. In free-form surfacing terminology, the acronym CNC stands for: |
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A.
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Compensated Numerical Curvature |
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B.
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Computer Numerically Controlled |
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C.
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Compact Nanotechnology Computer |
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D.
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None of the above |
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| 15. Skew distortion in progressive lenses is due to: |
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A.
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Curvatures differences across the front surface |
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B.
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Cylinder power as a result of curvature differences |
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C.
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Both A and B |
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D.
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Neither A nor B |
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| 16. A free-form generator can produce virtually any lens surface shape using: |
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A.
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Three-axis, single-point cutting |
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B.
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Two-axis, single-point cutting |
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C.
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One-axis, single-point cutting |
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D.
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All of the above |
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| 17. A compensated prescription generally results in changes to all of the following except: |
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A.
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Change in the lens color |
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B.
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Change in the sphere power |
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C.
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Change in the cylinder power |
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D.
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Change in the cylinder axis |
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| 18. A free-form surfacing process can produce the following lens surfaces: |
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A.
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Aspheric surfaces |
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B.
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Atoric surfaces |
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C.
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Progressive surfaces |
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D.
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All of the above |
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| 19. Free-form lens suppliers may claim one or more of the following benefits for back-surface free-form progressive lenses: |
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A.
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Slightly wider fields of view |
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B.
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Potential misalignment between the front and back surfaces |
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C.
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Slightly less skew distortion |
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D.
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Precise replication of the progressive lens design |
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| 20. With sufficiently advanced optical design tools, free-form progressive lenses can offer wearers: |
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A.
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Progressive lenses customized for the wearer's prescription |
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B.
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Progressive lenses customized for the wearer's position of wear |
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C.
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Progressive lenses customized for the wearer's lifestyle |
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D.
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All of the above |
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