Transcript ANSI Standards Zoomerang Summary

“Zoomerang” Internet Questionnaire
on power measurement practices
– Analysis of response by
Optician Association of America (OAA)
Feb 2008 data
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
03-Mar-08
Optician Association of America (OAA)
“Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
At the Sept. 2007 ANSI Z80.1 meeting, the topic of ANSI /ISO
power measurement practices and tolerances use was discussed
Dick Whitney agreed to work on a questionnaire to
determine industry practices in power measurement. Joe
Dezenzo (Luxottica Retail) volunteered to assist.
In Dec 2007, Dick drafted a set of questions and sent to Joe;
Joe refined them and pursued on line “Zoomerang” method.
Joe worked with the Opticians Association of America
(OAA) and got their agreement to participate in an
Internet “Zoomerang” Survey. Their cooperation is most
appreciated.
Optician Association of America (OAA)
“Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
The following 10 questions were asked of the OAA members:
1.) What type of power measurement equipment is used in your facility?:
a)
b)
c)
d)
Automatic Focimeter /Lensometer
Manual Focusing Lensometer– Scale output
Manual Focusing Lensometer – digital output
Both Automated and manual focusing
2.) What cyl mode is used for display?
a)
b)
Minus cyl (-)
Plus cyl (+)
3.) If digital output, what increment readout (rounding) is used?
a)
b)
c)
d)
e)
none
0.12
0.25
Other
Don’t know
Optician Association of America (OAA)
“Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
4.) What Standards or specifications do you use for RX power verification /
acceptance?
a)
b)
c)
d)
Internal / company specifications
ANSI Z80.1
ISO 8980
Other
5.) Where are these Standards or Specs located?
a)
b)
c)
d)
Next to the Lensometer
In a drawer
Not sure
Don’t have them
6.) How long have you used these tolerances?
a)
b)
c)
Less than 5 years
Six to ten years
More than 10 years
Optician Association of America (OAA)
“Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
7.) What action(s) might you do you use if the lens has been found to be out
of tolerance for power?
a)
b)
c)
d)
Re-measure a second time on same instrument without moving lens
Re-measure a second time on same instrument, moving lens
Measure on another instrument
Reject lens without re-measurement
*8.) Does your facility use a computer system to determine if the lens meets power
tolerances?
a) Yes
b) No
Optician Association of America (OAA)
“Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
9.) Question asked: Do you tolerance the sphere and cyl meridians individually or the
powers when checking the cyl?
a)
Sphere and Cyl
=What is displayed on Automated Units and written in Rx’s
b.) Sphere / Cyl Meridians
Both principle focus powers, cyl must be
computed for manual focusing, cyl
meridian must be computed for automated
c.) Don’t know
= Perhaps the most honest answer! 
Optician Association of America (OAA)
“Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
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?
a)
b)
Pass
Fail
Optician Association of America (OAA)
“Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
Let’s review the outcome!
Number of OAA participants= 331 in the following categories:
Wholesale Lab
4%
Retail Chain
20%
O.D. Office
21%
M.D. Office
18%
Private Optician
29%
Other, please specify
8%
Optician Association of America (OAA)
“Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
Question 1 Response – Type of Instrument
OAA (Opticians Assoc. of America)
Reponse to Feb08 Zoom erang Questions
70%
60%
50%
40%
30%
20%
10%
0%
Automatic
Lensometer
Manual Focusing
Lensometer-Scale
output
Manual Focusing
Lensometer-Digital
output
Both Automatic and
Manual Focusing
Question 1- Type of Instrum ent
Automatic
19%
Manually focusing
65%
Manually focusing digital
Both
3%
32%
Optician Association of America (OAA)
“Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
Question 2: Cyl Mode output (where it applies)
OAA (Opticians Assoc. of Am erica)
Reponse to Feb08 Zoom erang Questions
100%
80%
60%
40%
20%
0%
Minus cyl (-)
Plus cyl (-)
Question 2- Cyl Mode output used
Minus cyl (-)
82%
Plus cyl (-)
18%
Optician Association of America (OAA)
“Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
Question 3: Increment rounding (where it applies)
OAA (Opticians Assoc. of Am erica)
Reponse to Feb08 Zoom erang Questions
40%
30%
20%
10%
0%
None
0.12
0.25
Don't know
Other
Question 3 - Instrum ent rounding used
None
27%
0.12
35%
0.25
23%
Don't know
7%
Other
8%
Optician Association of America (OAA)
“Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
Question 4: What Standards / Specs do you use?
OAA (Opticians Assoc. of Am erica)
Reponse to Feb08 Zoom erang Questions
100%
80%
60%
40%
20%
0%
Internal / Co
Specifications
ANSI Z80.1
ISO 8980
Question 4- What Standard s or 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)
Question 5: Where do you keep your Specs?
OAA (Opticians Assoc. of America)
Reponse to Feb08 Zoomerang Questions
80%
70%
60%
50%
40%
30%
20%
10%
0%
Next to the
Lensometer
In a draw er
Not sure
Do not have any on
site
Question 5- Where do you keep the Standards / Specs that you use?
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)
Question 6: When did you last update your Specs?
OAA (Opticians Assoc. of Am erica)
Reponse to Feb08 Zoom erang Questions
80%
60%
40%
20%
0%
Less than five years
Six to ten years
M ore than ten years
Don't know
Question 6- When w as the last tim e you updated your tolerances?
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)
Question 7: What do you do when lens is out for power?
OAA (Opticians Assoc. of America)
Reponse to Feb08 Zoomerang Questions
60%
50%
40%
30%
20%
10%
0%
Re-measure on Re-measure on
same
same
instrument
instrument,
w ithout moving
moving lens
lens
Measure on
another
instrument
Reject lens
w ithout remeasurement
Other, please
explain
Question 7- What Action(s) might you use if the lens is found out of tolerance?
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)
* Question 8: Do you use a computer to see if the lens meets your power tolerances?
OAA (Opticians Assoc. of America)
Reponse to Feb08 Zoomerang Questions
100%
80%
60%
40%
20%
0%
Yes
No
Question 8- Do you use a computer to determine if the lens meets your power tolerances?
Yes
7%
No
93%
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?
Just for review:
<= Meridian 1 Image
Meridian 2 Image 
Sphere image (equally focused lines)
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)
Question 9: What meridians / values do you tolerance?
OAA (Opticians Assoc. of America)
Reponse to Feb08 Zoomerang Questions
100%
80%
60%
40%
20%
0%
Sphere and Cyl separate
Both Sphere/Cyl
Meridians
Don't know
Question 9- What Meridians 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)
Prescribed Rx: +0.25=-3.25 x 103
Question 10:
Measured Rx: +0.37= -3.18 x 103
Would you pass or fail this lens for power?
OAA (Opticians Assoc. of America)
Reponse to Feb08 Zoomerang Questions
Prescribed Rx:+0.25 -3.25 Measured Rx: +0.37 -3.18
80%
60%
40%
20%
0%
Series1
Pass
Fail
67%
33%
Question 10- Would you pass or fail the RX
?
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)
It depends on what tolerances / specifications you are
using…
Question 10:
Prescribed Rx: +0.25=-3.25 x 103
Measured Rx: +0.37= -3.18 x 103
OAA (Opticians Assoc. of America)
Reponse to Feb08 Zoomerang Questions
Prescribed Rx:+0.25 -3.25 Measured Rx: +0.37 -3.18
80%
60%
40%
20%
0%
Series1
Pass
Fail
67%
33%
Question 10- Would you pass or fail the RX
?
For those 67% who would pass the lens, they
are using “common US Industry practice” and
neither ANSI 1995 / 2005 or ISO 8980…
Here is how “Common US Industry practice” would have passed the lens:

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 one might fail the lens using ANSI
standards since 1995 (~ISO)
Step
Sphere
Cyl
1
Record desired RX / Transpose if necessary
0.25
-3.25
2
3
4
5
6
Measure lens / record reading
Look up tolerance on Sphere power (Meridian 1)
Compute abs difference for sphere reading
Pass / Fail for sphere power error
Look up tolerance on Cyl
0.37
0.12
0.12
Pass
-3.18
7
Compute abs difference for Cyl
8
9
10
Pass / Fail for cyl
Compute intended cylinder meridian power from sph / cyl
Compute measured cylinder meridian power from sph / cyl
-3.00
-2.81
11
Look up tolerance on Cylinder Mer power (Meridian 2)
0.12
12
13
Compute abs difference for Cyl Mer reading
Pass / Fail for cyl meridian power error
0.19
Fail
0.12
0.07
Pass
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.
The ANSI /ISO method can only practically be used using a computer
to calculate pass fail as it relies on tables like this:
Recall that 93% of respondents
did not use a computer at inspection.
Could you figure the pass fail without a computer?
ANSI / ISO table
From their answer to question 10,
67% did not use the ANSI /ISO Method
even though 83% said they did!
Optician Association of America (OAA)
“Zoomerang” response to Questions on power measurement practices –
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)
Thanks to the OAA for their
cooperation!
It is proposed that other organizations
take part in a similar study. Any
comments or suggestions?
Dick Whitney (CZV) / Joe Dezenzo (Luxottica Retail)