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19 Cards in this Set
- Front
- Back
Which of the following are correct? |
(Near power)-(distance power)=(near addition) |
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If a right lens has an outset of 1mm and a seg inset of 2.5 mm, what is the total inset |
1.50 mm |
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The lensometer reads: -1.00-1.00x180 in dist. +0.50-1.00x180 in intermed +1.50-1.00x180 in near what is the add? |
+2.50 (Dist. Sphere + Near portion = Near Add) |
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What percent is the intermediate seg power?(previous question) |
60% |
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If you could not see a lens and could only feel the surfaces, which of the following multifocals could not be distinguished from a single vision lens? |
Fused glass multifocals |
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An executive lens is an example of which type of construction? |
One piece |
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Which of the following multifocal construction methods are used only with glass? |
Fused |
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True or False, one-piece multifocal construction is used with plastic only. |
False: can be made with any material |
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22 mm round seg |
11mm below |
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Flat-top 28 seg |
4.5 mm- 5 mm below |
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Franklin-style segment |
0 mm below: OCs are centered |
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38-mm round segment |
19 mm below |
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Curved top seg |
4.5 mm- 5 mm below |
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Which of the following bifocal lenses are always monocentric? |
Franklin Style seg |
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What lens could be substituted for a Rede-Rite bifocal? |
No replacement |
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A tropical that looks similar to a flat-top trifocal with an upside-down flat-top bifocal in the upper half is called? |
Quadrafocal |
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This lens appears to be a large round segment at the top of the lens and no segment at the bottom. The round segment area at the top is distance prescription, and the rest is the near add. |
Rede Rite |
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T or F, Double segment occupational lenses are available with Franklin-style segments |
True |
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What is the formula to find seg drop? |
Seg height - B dimension /2 = seg drop |