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19 Cards in this Set
- Front
- Back
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A light rays striking a surface at 90° will |
Slow down |
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1 m is equal to blank centimeters and blank millimeters |
100cm, 1000mm |
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A1 diopter lens for reflect light rays to a focus of blank from the lens |
1 meter |
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Which of the following lengths powers has the shortest focal length? |
3.00 D |
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The pointed tip of a prism is known as the? |
Apex |
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Light rays passing through a prism will be bent toward the |
Base |
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Prism power is measured in units of blank blank |
Prism diopters |
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A 1prism will displace an image blank centimeters for every blank meter of distance |
1;1 |
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Describe the difference between a spherical lens and the cylindrical lens |
A spherical lens has the same power in all meridians with a single focal point. A cylindrical lens has power that varies based on the Meridian with two focal points |
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Biconvex |
Both lens surfaces or convex |
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Plano convex |
One flat surface the other surface convex |
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Bicóncave |
Both services or concave |
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Plano concave |
One flat surface the other surface concave |
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Meniscus |
One concave surface the other surface convex |
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Which of the above lenses are most often used in opthalmic prescriptions? |
Meniscus |
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A spherocylindrical lens has two powers located blank degrees from each other |
90 |
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Prentices rule states that induced prism is equal to the blank multiplied by the blank |
Lens power;displacement in cm |
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How does the optical lab avoid induced prism? |
Decentration |
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What decentration is required if a frame PD is 60 mm and the patients PD is 58 mm? |
1mm each Lens |
