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TIPS NO |
249 |
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Date: |
May 2006 |
KODAK Concise™ InstaShades®
PolyClear® Progressive Lens
in Gray and Brown
Product Specifications and Fitting Guide.
Purpose:
The following is provided for fitting
and processing KODAK Concise InstaShades
PolyClear Lenses. As with all technical
information, please check for updates if a good amount of time has elapsed from
the printed publication date.
|
Characteristics |
KODAK Concise
InstaShades PolyClear Lens |
|
Refractive
Index |
1.586 ref d |
|
Dispersion
Value (Abbe) |
28.0 (standard polycarbonate) |
|
Density |
1.20 |
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Chemical
Resistance |
Fair (avoid all
solvents except IPA) |
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Machinability |
Good |
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Rear
Surface Coating |
Required |
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UV
Transmission cutoff |
> 380 nm, less
than 1% UVA and UVB |
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Scratch
Resistance |
RLXPlus® in mold coating |
Unique Semi-Visible Mark: KcP
Blank Size: 74mm diameter blanks decentered 3mm
Effective diameter is 80mm.
Base Curves: 1.25, 3.25, 5.50, 7.50
Thicknesses: We recommend a minimum center thickness of 1.5mm and a minimum edge of 1.3mm. To ensure proper frame retention, low power lenses may require greater thickness. Special frame mounts, such as grooved lenses, should have a 2.3mm edge thickness with the groove centered on the edge.
KODAK Concise InstaShades PolyClear Lens - Dimensions
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Nominal Curve |
True Curve |
Radius mm |
SAG at 50mm |
Nominal Concave |
Edge Thickness |
Center Thickness |
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1.25 |
1.16 |
456.897 |
0.68 |
6.00 |
14.8 |
8.70 |
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3.25 |
3.14 |
168.790 |
1.86 |
6.00 |
13.1 |
9.6 |
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5.50 |
5.40 |
98.148 |
3.24 |
6.00 |
8.8 |
8.9 |
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7.50 |
7.40 |
71.622 |
4.50 |
6.00 |
10.3 |
13.4 |
General:
Processing
of the KODAK Concise InstaShades PolyClear lens is similar to that of standard polycarbonate
lenses. Generator, edger wheels, and
fining pads designed for polycarbonate must be used. If you have questions on processing the KODAK
Concise InstaShades PolyClear lenses, please contact our Technical Services
department at 800 759-4630.
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 Concise 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.
Semi-Visible Markings:
KODAK Concise Lens markings
have a “+” at the nasal and temporal sides along the 180º axis line.
Approximately 3mm below the nasal “+” you will find the KcP product code. Approximately
3mm below the temporal “+” you will find the add power of the lens. These marks can be located by visually
inspecting the lens. Position the lens
at arm's length, preferably in front of an overhead fluorescent light. Slowly move the lens away from the edge of
the light fixture while looking at the estimated location of the marks along
the surface of the lens. The marks will
become visible at a given angle of light.
Removal/Remarking the Temporary Reference Marks:
The KODAK Concise InstaShades
Lens marks are designed to withstand all processing procedures. They provide an easy way to verify the edging
accuracy. The markings may be removed by
wiping the surface with alcohol or other standard polycarbonate lens mark
removing solvents.
To re-mark the lens, first
locate the semi-visible markings, specifically the “+” symbols engraved along
the 180º axis line (see above procedure for locating the semi-visible
marks). Once you have located the
semi-visible markings, use a felt pen to mark a spot over the “+” symbols and
trace the progressive markings using the KODAK Concise Lens Verification Mask
or the Center/Sizing chart. Use the
fitting cross to accurately optimize optics during final fitting of KODAK
Concise Instashades Lenses.
Fining and Polishing:
Processing the KODAK Concise
InstaShades PolyClear 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.
Layout for edging should be done in reference to the fitting cross
located 2.0mm above the MRP. The fitting cross is placed at the point of the
specified segment height and monocular PD.
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 Concise InstaShades PolyClear lenses. Be sure that your AR coating is compatible
with your backside coating. Include
impact testing for lenses AR coated and sold by your lab. 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.
Fitting and Frame Selection:
Our minimum fitting height
(sometimes called the segment height) guideline is 17mm, based on the 12mm
corridor length. The measurement
includes 2mm above the reference dot where the fitting cross is marked, as well
as 3mm of clear area below the full addition location. Minimum fitting height values are completely
Rx and frame dependent. The frame shape and patient’s monocular PDs will affect
this minimum fitting height, which is measured from the lowest point of the
frame and not the lowest point of the frame where the reading area falls.
Illustration 1.0 shows that the near zone may not fall inside the frame for
certain frame and monocular PD requirements.
The simplest and most
accurate way to ensure that an adequate distance & near area will be
enclosed within the frame is to use the KODAK Concise center/sizing chart. Mark each fit point on the demonstration
lenses in the frame and lay it over the center/sizing chart to verify the
critical optical zones fall within the eye wire.
If a small portion of the
critical optical area is outside the frame, discuss with the patient the
optical compromise that will occur if this frame is used.
Illustration 1.0
Kodak is a trademark of Kodak,
used under license by Signet Armorlite, Inc.
InstaShades and RLXPlus are registered trademarks and Concise,
PolyClear, and MultiMatrix are trademarks of Signet Armorlite, Inc.
KODAK Concise
InstaShades PolyClear Base Curve Selection
Chart
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0.0 |
-0.5 |
-1.0 |
-1.5 |
-2.0 |
-2.5 |
-3.0 |
-3.5 |
-4.0 |
-4.5 |
-5.0 |
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5.0 |
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5.0 |
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4.5 |
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4.5 |
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4.0 |
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7.50 base |
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4.0 |
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3.5 |
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3.5 |
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3.0 |
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3.0 |
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2.5 |
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2.5 |
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2.0 |
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2.0 |
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1.5 |
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1.5 |
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1.0 |
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1.0 |
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0.5 |
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5.50 base |
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0.5 |
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0.0 |
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0.0 |
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S |
-0.5 |
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-0.5 |
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P |
-1.0 |
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-1.0 |
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H |
-1.5 |
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-1.5 |
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E |
-2.0 |
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-2.0 |
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R |
-2.5 |
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-2.5 |
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E |
-3.0 |
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-3.0 |
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-3.5 |
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-3.5 |
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-4.0 |
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3.25 base |
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-4.0 |
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-4.5 |
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-4.5 |
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-5.0 |
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-5.0 |
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-5.5 |
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-5.5 |
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-6.0 |
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-6.0 |
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-6.5 |
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-6.5 |
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-7.0 |
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1.50 base |
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-7.0 |
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-7.5 |
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-7.5 |
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-8.0 |
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-8.0 |
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-8.5 |
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-8.5 |
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0.0 |
-0.5 |
-1.0 |
-1.5 |
-2.0 |
-2.5 |
-3.0 |
-3.5 |
-4.0 |
-4.5 |
-5.0 |
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