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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)
State the ANSI standards for segment rotation for a MF
Mounted lens
2degrees
State the ADD power tolerance for MF Add power.
Add power (D) Tolerance (D)
How ≤4.00 ±0.12
>4.00 ±0.18
State ANSI standards for Prescribed Prism
0.00Δto 2.00 Δ ±0.25Δ
>2.00Δto 10.00Δ ±0.37Δ
>10.00Δ ±0.50Δ
Horizontal segment location
±2.5mm total Inset should appear symmetric and balanced unless specified monocular
ANSI standards for BC warpage is:
+/- 1.00 with in 6mm of the frame/lens edge
ANSI standards for BC variance when specified on the Rx or Job ticket is:
+/-0.75D from Specified Base Curve
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
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
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
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!
ANSI standards for Safety lens thickness are:
Safety Eyewear thickness 3.0mm at the thinnest point
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
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
Drop ball testing standards for glass safety eyewear are:
Safety eyewear-Glass lenses
-Steel ball
: 5/8ths” -1.0 oz – dropped at 50 inches
Author
Anonymous
ID
243561
Card Set
Ansi
Description
ansi optical
Updated
2013-10-29T04:53:09Z
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