Ansi

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Author:
Anonymous
ID:
243561
Filename:
Ansi
Updated:
2013-10-29 00:53:09
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Ansi optical
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ansi optical
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  1. State the ANSI standards for Multifocal segment height:
    • Single lens un-mounted
    • ±1.0mm

    • Lens pair (mounted or un-mounted)
    • ±1.0mm (only one lens can be off)
  2. State the ANSI standards for segment rotation for a MF
    • Mounted lens
    • 2degrees
  3. State the ADD power tolerance for MF Add power.
    Add power (D)    Tolerance (D)

    • How ≤4.00              ±0.12
    • >4.00                     ±0.18
  4. State ANSI standards for Prescribed Prism
    • 0.00Δto 2.00 Δ       ±0.25Δ
    • >2.00Δto 10.00Δ    ±0.37Δ
    • >10.00Δ                ±0.50Δ
  5. Horizontal segment location
    ±2.5mm total Inset should appear symmetric and balanced unless specified monocular
  6. ANSI standards for BC warpage is:
    +/- 1.00 with in 6mm of the frame/lens edge
  7. ANSI standards for BC variance when specified on the Rx or Job ticket is:
    +/-0.75D from Specified Base Curve
  8. ANSI standards for Spherical power of the Rx is
    From 0.00 to(+/-)6.50D     (+/-)0.13 D

    Above (+/-)6.50            2% of sphere power
  9. ANSI standards for Cylindrical power of a RX are:
    • From 0.00 to (+/-)2.50 D     (+/-)0.13 D
    • From 2.12 to 4.50 D           (+/-)0.15 D
    • Above (+/-)4.50 D     (+/-)2% of sphere power
  10. ANSI standards for Cylinder AXIS variance are:
    • 0.0   - 0.37      (+/-)7
    • >0.37 -0.75     (+/-)5
    • >0.75 -1.50     (+/-)3
    • >1.50             (+/-)2
  11. ANSI standards for Dress lens thickness are:
    • +/- 0.30mm when specified
    • Dress Eye-wear thickness
    • (2.0, 2.2 (for this class), 1.5, 1.0)
    • No real tolerance!
  12. ANSI standards for Safety lens thickness are:
    Safety Eyewear thickness 3.0mm at the thinnest point
  13. ANSI standards for UNWANTED prism effect due to a error in the placement of the manufactured PPD are:
    • -Vertical:
    • 1/3rd Prism
    • diopter 0.33

    • -Horizontal:
    • 2/3rd prism
    • diopter 0.67
  14. Drop ball testing standards for glass dress eyewear are:
    • Impact resistance
    • Dress eyewear-Glass lenses
    •     -Steel ball: 5/8ths” -0.56 oz – dropped at 50 inches
  15. Drop ball testing standards for glass safety eyewear are:
    • Safety eyewear-Glass lenses
    • -Steel ball: 5/8ths” -1.0 oz – dropped at 50 inches

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