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“ANSImplified” – A Practical Application of Z80.1 By Dick Whitney – Nov 7, 2010 MA Opticians ABO Course. Dick Whitney (Carl Zeiss Vision / ANSI Z80.1 Chair). 11-07-10. “ANSImplified” – A Practical Application of Z80.1 By Dick Whitney – Nov 7, 2010 MA Opticians ABO Course. - PowerPoint PPT Presentation
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11-07-10Dick Whitney (Carl Zeiss Vision / ANSI Z80.1 Chair)
“ANSImplified” – A Practical Application of Z80.1
By Dick Whitney – Nov 7, 2010 MA Opticians ABO Course
11-07-10Dick Whitney (Carl Zeiss Vision / ANSI Z80.1 Chair)
“ANSImplified” – A Practical Application of Z80.1
By Dick Whitney – Nov 7, 2010 MA Opticians ABO Course
Introduction & Personal Background
Present responsibilities
Global Standards Mgr – Carl Zeiss VisionChair of Vision Council Len Technical Committee since 1997Chair of ANSI Z80.1Chair of ISO 14889 Fundamental StandardDirector of AO/ Optical Heritage Museum
http://www.opticalheritagemuseum.org
Background
Born and presently live in SouthbridgeEmployed by AO/SOLA/CZV since 1974Began in Materials Testing Lab conducted physical and optical testing for AOQC work/ engineering for AOLITE CR-39 processLens Design –SF Aspheric Aspherlite &AO55Design implementation -AO Pro Easy , AO Compact
1954
1:05Dick Whitney (Carl Zeiss Vision / ANSI Z80.1 Chair)
“ANSImplified” – A Practical Application of Z80.1
By Dick Whitney – Nov 7, 2010 MA Opticians ABO Course
Course topic outline
1.ANSI Z80.1 Prescription Lens Standard scope / purpose/makeup of experts – 5 min
2.General History of Standard- 5 min
3.Must I comply?- 5 min
4.What’s new ? 5 min
5.ANSI Research for this revision – 10min
6.ANSI 2010- Compliance with Power tolerances just got easier – 10 min
7.ANSI Cyl Axis tolerances of 2005 and 2010 – adopted by ISO - 5 min
8.What about the next revision – any suggestions? 3 min
9.Feedback / Questions / comments – 2 min
1:10Dick Whitney (Carl Zeiss Vision / ANSI Z80.1 Chair)
“ANSImplified” – A Practical Application of Z80.1
By Dick Whitney – Nov 7, 2010 MA Opticians ABO Course
1. ANSI Z80.1 Prescription Lens Standard scope / purpose/makeup of experts – 5 min
Dick Whitney (Carl Zeiss Vision / ANSI Z80.1 Chair)
“ANSImplified” – A Practical Application of Z80.1
By Dick Whitney – Nov 7, 2010 MA Opticians ABO Course
1. ANSI Z80.1 Prescription Lens Standard scope / purpose /makeup of experts – cont
Dick Whitney (Carl Zeiss Vision / ANSI Z80.1 Chair)
“ANSImplified” – A Practical Application of Z80.1
By Dick Whitney – Nov 7, 2010 MA Opticians ABO Course
1. ANSI Z80.1 makeup of experts from 18 org
1:15Dick Whitney (Carl Zeiss Vision / ANSI Z80.1 Chair)
“ANSImplified” – A Practical Application of Z80.1
By Dick Whitney – Nov 7, 2010 MA Opticians ABO Course
2. General History of Standard- 5 min
Historic ANSI Z80.1 Spectacle Lens Documents:
In 1956, the ANSI Z80 Standards Committee for Ophthalmic Lenses was organized. First Standard applying to lenses and included mounting tolerances was issued in 1964
ANSI Z80.1 - 1964 Cr. Carl R. Rudolph - Chairman ANSI Z80.1 - 1972 Arthur H. Keeney - ChairThe 1972 Standard included "relaxed" tolerances for plastic and heat treated lenses. This version included tolerances for off-axis performance for SV lenses, which were subsequently dropped in the next revision. ANSI Z80.1 - 1979 Arthur H. Keeney - ChairShifted to Mass produced lenses, away from factory finished. The title was changed from requirement to recommendation.
Dick Whitney (Carl Zeiss Vision / ANSI Z80.1 Chair)
“ANSImplified” – A Practical Application of Z80.1
By Dick Whitney – Nov 7, 2010 MA Opticians ABO Course
2. General History of Standard- cont.
ANSI Z80.1 - 1987 Jeff Kosh- ChairMore definitions, tutorials, and UV absorbance in lens materials addressed. ANSI Z80.1 - 1995 Jeff Kosh - ChairAdopted ISO power tolerances by each meridian, which turned out to be a mistake that took 15 years to fully correct. ANSI Z80.1 - 1999 Jeff Kosh - ChairInitial changes that loosened, but did not eliminate ISO power tolerance approach. ANSI Z80.1- 2005 Dan Torgersen - ChairSignificant change to the Axis angle tolerance was made, toReflect capabilities without compromise to wearer. ANSI Z80.1 -2010 Dan Torgersen – Chair Published in July 2010
1:20Dick Whitney (Carl Zeiss Vision / ANSI Z80.1 Chair)
“ANSImplified” – A Practical Application of Z80.1
By Dick Whitney – Nov 7, 2010 MA Opticians ABO Course
3. Must I comply?- 5 min
Since 1979, the ANSI Z80.1 standard has been a recommendation, not a requirement
They are recommended guidelines, which when followed will help to deliver quality product to the consumer.
It is highly desirable to strive to meet this standard, but strict compliance is not always possible as noted in the Purpose section of ANSI Z80.1 .
While ANSI is not a requirement , local and state laws may dictate otherwise (NJ, CA).
ANSI Standards bodies strive for minimum requirements, in order not to restrict trade or inhibit new and different technologies.
1:25Dick Whitney (Carl Zeiss Vision / ANSI Z80.1 Chair)
“ANSImplified” – A Practical Application of Z80.1
By Dick Whitney – Nov 7, 2010 MA Opticians ABO Course
4. What’s new? 5 min
Power tolerance method revision: The 2010 standard applies tolerances to the measured sphere and cyl (- notation) for a given RX
As worn correction for Rx ‘s permitted A clarification was added to permit tolerancing of an RX to the as worn corrected value, rather than the Rx as written by the Doctor. It reads “For lenses produced with compensations to account for as worn correction, the tolerances in the tables in section 5.0 apply to those values specified by the manufacturer, and not to the prescribed RX.”
Relaxation of Cyl Axis tolerance for weak cyls (first adopted in 2005, reaffirmed and adopted by ISO
Adoption ISO 8980-4&5 into ANSI Z80.1 -2010 ISO 8980-4 (AR Durability test method) standard was adopted in full ISO 8980-5 (Minimum Abrasion resistance if claimed) was also adopted in full. If abrasion claims to a lens surface or surfaces are made, this test requirement must be satisfied.
Optician Association of America (OAA) “Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
5. ANSI Research for this revision – 5 min The following set of slides were presented resulting from a study of Focimeter power measurement practices determined from a questionnaire that I developed and was circulated on line to the Optician Association of America (OAA).
The feedback from this study convinced the ANSI Z80.1 committee to change the standard to comply with these practices.
Optician Association of America (OAA) “Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
In Dec 2007, Dick drafted a set of questions and sent to Joe Dezenzo (Luxotttica) who agree to coordinate sending them out; Joe coordinated an on line “Zoomerang” internet questioning method.
5. ANSI Research for this revision – 5 min
At a the Fall 2007 ANSI Z80 meeting, Dick Whitney agreed to work on a questionnaire to determine industry practices in power measurement. Joe Dezenzo (Luxottica Retail) volunteered to assist.
Optician Association of America (OAA) “Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
Wholesale Lab
Retail Chain
O.D. Office
M.D. Office
Private Optician
Other, please specify
Let’s review the outcome!
Number of OAA participants= 331 in the following categories:
4% 20% 21% 18% 29% 8%
Optician Association of America (OAA) “Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
OAA (Opticians Assoc. of America) Reponse to Feb08 Zoomerang Questions
0%10%20%30%40%50%60%70%
AutomaticLensometer
Manual FocusingLensometer-Scale
output
Manual FocusingLensometer-Digital
output
Both Automatic andManual Focusing
Question 1- Type of Instrument
Question 1 Response – Type of Instrument
Automatic 19%
Manually focusing 65%
Manually focusing digital 3%
Both 32%
Optician Association of America (OAA) “Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
OAA (Opticians Assoc. of America) Reponse to Feb08 Zoomerang Questions
0%20%40%60%80%
100%
Minus cyl (-) Plus cyl (-)
Question 2- Cyl Mode output used
Minus cyl (-) 82%
Plus cyl (-) 18%
Question 2: Cyl Mode output (where it applies)
Optician Association of America (OAA) “Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
OAA (Opticians Assoc. of America) Reponse to Feb08 Zoomerang Questions
0%
10%
20%
30%
40%
None 0.12 0.25 Don't know Other
Question 3 - Instrument rounding used
Question 3: Increment rounding (where it applies)
Optician Association of America (OAA) “Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
OAA (Opticians Assoc. of America) Reponse to Feb08 Zoomerang Questions
0%20%40%60%80%
100%
Internal / CoSpecif ications
ANSI Z80.1 ISO 8980
Question 4- What Standard s or Specs do you use?
Question 4: What Standards / Specs do you use?
Internal / Co Specifications 14%
ANSI Z80.1 83%
ISO 8980 0%
Other 3%
Optician Association of America (OAA) “Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
OAA (Opticians Assoc. of America) Reponse to Feb08 Zoomerang Questions
0%10%20%30%40%50%60%70%80%
Next to theLensometer
In a draw er Not sure Do not have any onsite
Question 5- Where do you keep the Standards / Specs that you use?
Question 5: Where do you keep your Specs?
Next to the Lensometer 70%
In a drawer 19%
Not sure 5%
Do not have any on site 7%
Optician Association of America (OAA) “Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
OAA (Opticians Assoc. of America) Reponse to Feb08 Zoomerang Questions
0%
20%
40%
60%
80%
Less than five years Six to ten years More than ten years Don't know
Question 6- When was the last time you updated your tolerances?
Question 6: When did you last update your Specs?
Less than five years 72%
Six to ten years 8%
More than ten years 3%
Don't know 17%
Optician Association of America (OAA) “Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
OAA (Opticians Assoc. of America) Reponse to Feb08 Zoomerang Questions
0%10%20%30%40%50%60%
Re-measure onsame
instrumentw ithout moving
lens
Re-measure onsame
instrument,moving lens
Measure onanother
instrument
Reject lensw ithout re-
measurement
Other, pleaseexplain
Question 7- What Action(s) might you use if the lens is found out of tolerance?
Question 7: What do you do when lens is out for power?
Re-measure on same instrument without moving lens 33%
Re-measure on same instrument, moving lens 57%
Measure on another instrument 46%
Reject lens without re-measurement 13%
Other, please explain 15%
Optician Association of America (OAA) “Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
OAA (Opticians Assoc. of America) Reponse to Feb08 Zoomerang Questions
0%
20%
40%
60%
80%
100%
Yes No
Question 8- Do you use a computer to determine if the lens meets your power tolerances?
* Question 8: Do you use a computer to see if the lens meets your power tolerances?
Yes 7%
No93
%
Optician Association of America (OAA) “Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
9.) Intended question: Do you tolerance both the sphere and cyl meridians along with the cyl, or just sphere and cylinder?
Sphere image (equally focused lines)
<= Meridian 1 Image
Meridian 2 Image
Just for review:
Cyl (written in Rx and displayed on automated focimeters) = Sum of Mer 1 and
Mer 2 Measured values; it does not have an image!
Optician Association of America (OAA) “Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
OAA (Opticians Assoc. of America) Reponse to Feb08 Zoomerang Questions
0%
20%
40%
60%
80%
100%
Sphere and Cyl separate Both Sphere/CylMeridians
Don't know
Question 9- What Meridians do you tolerance?
Question 9: What meridians / values do you tolerance?
Sphere and Cyl separate 76%
Both Sphere/Cyl Meridians 22%
Don't know 2%
Optician Association of America (OAA) “Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
OAA (Opticians Assoc. of America) Reponse to Feb08 Zoomerang Questions
0%
20%
40%
60%
80%
Question 10- Would you pass or fail the RX?
Series1 67% 33%
Pass Fail
Prescribed Rx:+0.25 -3.25 Measured Rx: +0.37 -3.18
Question 10:
Prescribed Rx: +0.25=-3.25 x 103 Measured Rx: +0.37= -3.18 x 103
Would you pass or fail this lens for power?
So which answer is correct?
The Answer is….
Optician Association of America (OAA) “Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
OAA (Opticians Assoc. of America) Reponse to Feb08 Zoomerang Questions
0%
20%
40%
60%
80%
Question 10- Would you pass or fail the RX?
Series1 67% 33%
Pass Fail
Prescribed Rx:+0.25 -3.25 Measured Rx: +0.37 -3.18
Question 10: Prescribed Rx: +0.25=-3.25 x 103 Measured Rx: +0.37= -3.18 x 103
It depends on what tolerances / specifications you are using…
For those 67% who would pass the lens, they are using “common US Industry practice” and neither ANSI 1995 / 2005 or ISO 8980…
Record prescribed RX: OD: +.25 = -3.25 x 103
Measure fabricated RX:
Is sphere error > .13? Absolute difference is .12, therefore sphere power acceptable Is cyl error > .13? Absolute difference is .07 and axis is 103 as prescribed, cyl
is acceptable.
Therefore, the lens Passes for power inspection
Here is how “Common US Industry practice” would have passed the lens:
Here is how one might fail the lens using ANSI standards since 1995 (~ISO)
1 Record desired RX / Transpose if necessary 0.25 -3.25
Step Sphere Cyl
2 Measure lens / record reading 0.37 -3.18
3 Look up tolerance on Sphere power (Meridian 1) 0.12
4 Compute abs difference for sphere reading 0.125 Pass / Fail for sphere power error Pass
6 Look up tolerance on Cyl 0.12
7 Compute abs difference for Cyl 0.07
8 Pass / Fail for cyl Pass
9 Compute intended cylinder meridian power from sph / cyl -3.0010 Compute measured cylinder meridian power from sph / cyl -2.81
11 Look up tolerance on Cylinder Mer power (Meridian 2) 0.12
12 Compute abs difference for Cyl Mer reading 0.19
13 Pass / Fail for cyl meridian power error Fail
The lens fails ISO tolerances for a power that is not displayed on the Focimeter, but must be calculated. It is also a failure to ANSI Z80.1 because of strongest meridian error, but few labs ever apply this. It passes the common practice of tolerancing the sphere and cyl.
1:40Dick Whitney (Carl Zeiss Vision / ANSI Z80.1 Chair)
“ANSImplified” – A Practical Application of Z80.1
By Dick Whitney – Nov 7, 2010 MA Opticians ABO Course
6. ANSI 2010 – Compliance with the power tolerances just got easier -
1:45Dick Whitney (Carl Zeiss Vision / ANSI Z80.1 Chair)
“ANSImplified” – A Practical Application of Z80.1
By Dick Whitney – Nov 7, 2010 MA Opticians ABO Course
7. ANSI Cyl Axis tolerances of 2005 and 2010 – adopted by ISO - 5 min
1:50Dick Whitney (Carl Zeiss Vision / ANSI Z80.1 Chair)
“ANSImplified” – A Practical Application of Z80.1
By Dick Whitney – Nov 7, 2010 MA Opticians ABO Course
8. What about the next revision – any suggestions?
9. Feedback / Questions / Comments ?
11-07-10Dick Whitney (Carl Zeiss Vision / ANSI Z80.1 Chair)
“ANSImplified” – A Practical Application of Z80.1
By Dick Whitney – Nov 7, 2010 MA Opticians ABO Course
Thank you for your attention!!!