TIPS NO: 247
Revision:
Date:
Mar 2006
KODAK
InstaShades® PolyClear™ Gray and Brown
Spherical
Single Vision Lenses
Product Specifications &
Processing Guide
Purpose: The
following information provides a guideline for processing the KODAK InstaShades
PolyClear Spherical Single Vision lens.
As with all technical information, please check for updates if a good
amount of time has elapsed from the printed publication date.
|
Characteristics |
KODAK InstaShades PolyClear Single
Vision Lens |
|
Refractive
Index |
1.586 ref d |
|
Dispersion
Value (Abbe) |
28.0 (standard polycarbonate) |
|
Density |
1.20 |
|
Chemical
Resistance |
Fair (avoid all solvents except IPA) |
|
Machinability |
Good |
|
Rear
Surface Coating |
Required |
|
UV
Transmission cutoff |
> 380 nm, less than 1% UVA and UVB |
Blank
Size: 74mm diameter blanks.
Base
Curves: 1.50, 3.25, 5.00, 7.50
Thicknesses:
: We recommend a minimum center thickness of 1.6mm,
or
1.8mm if AR coated.
InstaShades
lenses are designed with Multi-Matrix™ technology. The photochromic materials are contained
in approximately the front 0.8mm of the lens. The material behind the first 0.8mm
provides the optical properties.
The mechanical properties of the lenses depend on all of the
elements of the Multi-Matrix design.
Therefore, it is important to surface the lenses to meet or exceed
the recommended minimum center or edge thicknesses.
KODAK InstaShades
PolyClear Single Vision - Dimensions
|
Nominal Curve |
True Curve |
Radius mm |
SAG at 50mm |
Nominal Concave |
Edge Thickness |
Center Thickness |
|
1.50 |
1.45 |
365.517 |
0.86 |
6.00 |
14.0 |
7.8 |
|
3.25 |
3.23 |
164.087 |
1.92 |
6.00 |
12.9 |
8.9 |
|
5.00 |
4.96 |
106.855 |
2.97 |
6.00 |
9.6 |
8.1 |
|
7.50 |
7.49 |
70.761 |
4.56 |
6.00 |
10.1 |
12.3 |
General:
Processing of the KODAK
InstaShades PolyClear Single Vision Lens is similar to that of standard
polycarbonate. Generator, edger wheels,
and two-step fining pads designed for polycarbonate must be used.
If you have questions about
processing the KODAK InstaShades PolyClear Single Vision Lenses, please contact
our Technical Services department at 800 759-0075.
Computer Calculation of Rx:
The easiest, most efficient method to calculate and process values for
an Rx is to use an existing computer software package that contains KODAK Lens
design data. If your software company
has not included this data in its package, our Technical Services group will be
happy to provide the necessary specifications.
Please forward us the contact name and phone number of your software
vendor. If you need a software program
for processing lenses, Signet Armorlite has developed a computer program to
calculate surfacing data. This program is available through Signet Armorlite's
Technical Services Department.
Fining and Polishing :
Processing the KODAK InstaShades
PolyClear Single Vision lens is the same as processing other polycarbonate
lenses. Safety bevel the lens before fining to allow the slurry smoother access
along the lens surface. Large lap tools (at least 3 inch) should be used and
allowance made for approximately 0.3mm of stock removal. Perform a stock removal test, using your
process to most accurately establish the correct surfacing thickness
allowance. We strongly recommend fining
pads with eight or more petals be used for curves over 9.00 diopters. This can prevent aberrations and score lines.
Back Surface Coating:
Since the
processed back surface of the lens is standard polycarbonate, it must be hard
coated with a polycarbonate compatible coating.
Edging:
Edge this lens using techniques for polycarbonate lenses.
For rimlon or grooved lens type processing,
the groove should be placed so it is contained within the rear polycarbonate
portion of the lens. For
Drilling:
InstaShades
polycarbonate lenses have been successfully used on three-piece frames that
require drilling or slotting. Many
variables will contribute to successful three-piece frame usage. They include machining, smooth surfaces,
chamfering the edges, using grommets to cushion the contact, not
over-tightening the screws, and patient care.
The drilled portion of the lens may fail over time if the drilling was
done improperly. Please see TIPS 242,
“Making Stronger Three-Piece Eyewear,” for our recommendations on drilling and
screw torque measurement techniques. We
recommend no greater than 8 inches ounces of torque be applied to nuts of
three-piece frames.
AR Coating:
Multi-layer AR coatings can
be applied to KODAK InstaShades PolyClear Single Vision Lenses. Because lens
impact resistance is reduced by AR coatings, we recommend a 1.8mm minimum
center thickness and a backside coating that will enhance the impact resistance
capability. This minimum thickness
recommendation is based on surfacing to no less than 1.8mm and using
UltraOptics UVNV backside coating prior to applying AR coating. Other back surface coatings may enhance or
reduce the impact resistance after adding AR.
Be sure that your AR and
backside coatings are compatible. If you
have lenses AR coated by a coating service, include such samples in your impact
testing. This lens has a front surface
factory-applied hard coating which is designed to be compatible with most AR
coating processes. Please call Technical
Services at 800-759-0075 for additional information about coatings and impact
resistance.
Tinting:
We do not recommend tinting
InstaShades lenses. Doing so will void
any factory warranty. This coating is
applied in the mold and not considered strippable.
Kodak is a trademark of
Kodak, used under license by Signet Armorlite, Inc. InstaShades is a
registered trademark and PolyClear and Multi-Matrix are trademarks KODAK InstaShades
PolyClear Single Vision Lens Base Curve Selection
Chart
of Signet Armorlite, Inc.
|
|
Cylinder |
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Sphere Power |
0.00 |
-0.50 |
-1.00 |
-1.50 |
-2.00 |
-2.50 |
-3.00 |
-3.50 |
-4.00 |
-4.50 |
-5.00 |
Sphere Power |
|
7.00 |
|
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|
7.00 |
|
6.50 |
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6.50 |
|
6.00 |
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6.00 |
|
5.50 |
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5.50 |
|
5.00 |
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5.00 |
|
4.50 |
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7.50 Base |
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4.50 |
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4.00 |
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4.00 |
|
3.50 |
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3.50 |
|
3.00 |
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3.00 |
|
2.50 |
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2.50 |
|
2.00 |
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2.00 |
|
1.50 |
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1.50 |
|
1.00 |
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1.00 |
|
0.50 |
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5.00 Base |
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|
0.50 |
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|
0.00 |
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0.00 |
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-0.50 |
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-0.50 |
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-1.00 |
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-1.00 |
|
-1.50 |
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-1.50 |
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-2.00 |
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-2.00 |
|
-2.50 |
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-2.50 |
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-3.00 |
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3.25 Base |
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-3.00 |
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-3.50 |
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-3.50 |
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-4.00 |
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-4.00 |
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-4.50 |
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-4.50 |
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-5.00 |
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-5.00 |
|
-5.50 |
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-5.50 |
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-6.00 |
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1.50 Base |
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-6.00 |
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-6.50 |
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-6.50 |
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-7.00 |
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-7.00 |
|
-7.50 |
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-7.50 |
|
-8.00 |
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-8.00 |
|
-8.50 |
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-8.50 |
|
-9.00 |
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-9.00 |
|
-9.50 |
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-9.50 |
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-10.00 |
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-10.00 |
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|
0.00 |
-0.50 |
-1.00 |
-1.50 |
-2.00 |
-2.50 |
-3.00 |
-3.50 |
-4.00 |
-4.50 |
-5.00 |
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