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19 Cards in this Set

  • Front
  • Back

Which of the following are correct?

(Near power)-(distance power)=(near addition)

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

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)

What percent is the intermediate seg power?(previous question)

60%

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

An executive lens is an example of which type of construction?

One piece

Which of the following multifocal construction methods are used only with glass?

Fused

True or False, one-piece multifocal construction is used with plastic only.

False: can be made with any material

22 mm round seg

11mm below

Flat-top 28 seg

4.5 mm- 5 mm below

Franklin-style segment

0 mm below: OCs are centered

38-mm round segment

19 mm below

Curved top seg

4.5 mm- 5 mm below

Which of the following bifocal lenses are always monocentric?

Franklin Style seg

What lens could be substituted for a Rede-Rite bifocal?

No replacement

A tropical that looks similar to a flat-top trifocal with an upside-down flat-top bifocal in the upper half is called?

Quadrafocal

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

T or F, Double segment occupational lenses are available with Franklin-style segments

True

What is the formula to find seg drop?

Seg height - B dimension /2 = seg drop