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| 1. As the Add power of a progressive lens increases, the unwanted cylinder power typically: |
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A.
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Decreases |
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B.
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Increases |
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C.
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Remains Unchanged |
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D.
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Disappears |
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| 2. A “harder” Progressive Lens Design generally: |
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A.
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Spreads Surface Astigmatism across a Larger Region |
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B.
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Has Smaller Distance and Near Viewing Zones |
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C.
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Works Well for Active Viewing Tasks |
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D.
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Works Well for Critical viewing Tasks |
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| 3. An astigmatism contour plot of a “harder” progressive lens design generally has: |
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A.
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More Closely Spaced Astigmatism Contours |
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B.
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More Widely Spaced Astigmatism Contours |
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C.
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Neither Closely spaced nor Widely Spaced Contours |
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D.
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Both Closely Spaced and Widely Spaced Contours |
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| 4. A “softer” progressive lens design generally: |
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A.
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Concentrates Surface Astigmatism into Smaller Regions |
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B.
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Has Wider Distance and Near Viewing Zones |
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C.
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Works Well for Active Viewing Tasks |
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D.
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Works Well for Critical Viewing Tasks |
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| 5. An astigmatism contour plot of a “softer” progressive lens design generally has: |
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A.
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More Closely Spaced Contours |
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B.
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More Widely Spaced Astigmatism Contours |
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C.
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Neither Closely spaced nor Widely Spaced Contours |
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D.
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Both Closely Spaced and Widely Spaced Contours |
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| 6. The following is NOT an advantage of shorter progressive corridor lengths: |
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A.
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More Near Vision Utility in Smaller Frames |
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B.
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Reduced Eye Declination During Near Vision |
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C.
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More Rapidly Increasing Unwanted Cylinder Power |
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D.
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None of the Above |
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| 7. Progressive lens designs with ________ progressive corridors produce _________ unwanted cylinder power and/or narrow viewing zones: |
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A.
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shorter, more |
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B.
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shorter, less |
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C.
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longer, more |
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D.
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longer, less |
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| 8. A surface with a _____________ second derivative offers ____________ changes and power and magnification: |
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A.
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continuous first derivative, discontinuity |
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B.
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continuous second derivative, smooth |
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C.
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continuous second derivative, broken |
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D.
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None of the above |
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| 9. The variation in curvature from meridian to meridian at points in the periphery of a progressive lens surface is referred to as: |
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A.
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Surface Astigmatism |
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B.
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Ocular Astigmatism |
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C.
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Prescribed Cylinder |
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D.
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Spherical Aberration |
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| 10. “Higher order” wavefront aberrations include: |
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A.
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Coma |
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B.
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Spherical Aberration |
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C.
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Trefoil |
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D.
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All of the Above |
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| 11. _________________ states that the rate of change in cylinder power away from the progressive corridor is roughly equal to twice the rate of change in add power along the corridor: |
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A.
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Minkwitz's theorem |
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B.
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Garcy's 1st Law |
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C.
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The Theory of Refraction |
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D.
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Spline Theory |
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| 12. The following visual requirement is NOT a consideration for progressive lens design: |
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A.
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Good Critical Vision |
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B.
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Good Dynamic Vision |
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C.
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Good Subnormal Vision |
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D.
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Good Binocular Vision |
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| 13. The process of heating a glass mold over a former until it assumes the shape of the former is known as: |
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A.
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Digital Surfacing |
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B.
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Free-Form Surfacing |
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C.
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As-Worn Optimization |
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D.
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Slumping |
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| 14. When characterizing progressive lenses, ____________ is comparable to cylinder power and _____________ is comparable to sphere power. |
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A.
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mean power, sphere power |
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B.
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astigmatism, mean power |
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C.
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astigmatism, conic power |
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D.
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mean power, astigmatism |
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| 15. The rate of change in progressive surface astigmatism around the umbilic is ______________ to the Add power. |
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A.
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proportional |
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B.
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inversely proportional |
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C.
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equal |
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D.
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twice the distance |
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| 16. All of the following affect the performance and wearer acceptance of a lens design except |
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A.
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magnitude of power and astigmatism |
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B.
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distribution of power and astigmatism |
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C.
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gradient of power and astigmatism |
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D.
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add power |
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| 17. Continuous surface height results in a surface with no |
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A.
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breaks |
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B.
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discontinuities |
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C.
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ledges |
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D.
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all of the above |
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| 18. The first step in progressive lens design defines the |
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A.
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size of distance and near zone |
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B.
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geometry of the progressive corridor |
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C.
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distribution of optics in the periphery |
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D.
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all of the above |
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| 19. Modeling the theoretical optical performance of a lens using position of wear and calculating light refraction is called |
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A.
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blur manipulation |
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B.
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ray-tracing |
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C.
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merit functions |
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D.
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osculating spheres |
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| 20. The initial design for a progressive may need to be modified to produce the final mold because of |
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A.
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lens materials shrinkage |
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B.
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manufacturing process variations |
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C.
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changes to desired surface powers |
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D.
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all of the above |
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