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A lens has a power of -0.75 D sphere for both right and left lenses. The wearer’s distance PD is 60mm, but the glasses are made with with optical center of 66mm. This will cause a total unwanted prismatic effect of .45 prisms for both right and left eyes combined. Is this prescription acceptable according to ANSI standards in regards to PD/ horizontal prism?

• YES

• NO

The patient is looking 4mm below the distance of the optical center of the following Rx: +3.00-1.00x180. What is the prismatic effect and direction?

• 1.1 BU

• 1.2 BD

• .8 BU

• .8 BD

The cylinder axis tolerance for a 0.75D cylinder prescription ophthalmic lens is:

• 7 Degrees

• 5 Degrees

• 3 Degrees

• 2 Degrees

The cylinder axis tolerance for a +/-1.00D cylinder prescription ophthalmic lens is:

• 7 Degrees

• 5 Degrees

• 3 Degrees

• 2 Degrees

The segmented location tolerance in the vertical (segment Height) meridian in a mounted pair of eyeglass is:

• Pairs should match within 2.00 mm of the specification

• Pairs should match within 1.0mm of specification

• Pairs should match within 2.2mm of the specification

• Must be exact

According to ANSI, what is the cylinder axis tolerance for the following RX?

-5.87-0.25x115

• +-14 Degrees

• +- 7 degrees

• +-5 degrees

• +- 3 degrees

If the Rx -3.00 +0.50 x090 is decentered out 4mm too much, how much prism will be created and in which direction is the base?

• 1.0 BI

• 1.0 BO

• .75 BI

• .75 BO

Geneva lens measure to:

• Measure lens

  thickness

• Measure segment height

• Measure lens

  diameter

• Measure lens base curve

The private agency whose function is to set commercial and industry standards is:

• ASTM

• ANSI

• ASCII

• OSHA

According to ANSI, what is the cylinder axis tolerance for the following RX?

-3.25 -1.25x115

• +-14

• +-5

• +-3

• +-7