KODAK Concise Progressive TLX 1.6 Lens Product Specifications and Fitting Guide

Transcription

1 TIPS NO 268 Date: FEB 2011 KODAK Concise Progressive TLX 1.6 Lens Product Specifications and Fitting Guide PURPOSE: The following information will assist you in processing KODAK Concise Progressive TLX 1.6 Lenses. KODAK Concise TLX1.6 Lens CHARACTERISTICS Refractive Index Dispersion Value (Abbe) 42.0 Density 1.30 Chemical Resistance Excellent Machinability Excellent Rear Surface Coating Required Scratch Resistant Front side coated UNIQUE SEMI-VISIBLE MARK: KC BLANK SIZE: 74mm diameter blanks decentered 3mm Effective diameter is 80mm. BASE CURVES:,,, 5.50, POWER RANGE: TO ADD RANGE: 1.00 to 3.00 in.25 Diopter steps. THICKNESSES: We recommend a minimum center thickness of 1.5mm, or 1.7mm if AR coated. Page 1 of 5 TIP 268 Feb 2011

2 KODAK Concise Progressive TLX1.6 Lens - DIMENSIONS Nominal Curve True Curve Radius mm SAG at 50mm Back Curve Edge Thickness Center Thickness GENERAL: Standard surfacing procedures for CR-39 progressive lenses should be used with the KODAK Concise TLX1.6 Lens, but bear in mind that TLX1.6 has a refractive index of If you have questions regarding these lenses, contact Technical Services at 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. LAYOUT: All surfacing should be done in relation to the prism reference point located on the 180 line. We recommend that you block the lens on the prism reference point even though the corridor is decentered 3 mm. If blocking is done on the geometric center of the blank, you must calculate the amount of decentration prism needed to move the optical center to the prism reference point. The fitting cross is located directly above the prism reference point dot. This improves the accuracy of positioning the patient's pupil to the center of the corridor. If you use an automated lens blocker, such as the Gerber Step-One System, and if you are blocking on the cross, be sure to use a segment placement on the lens blank of 2mm down. 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 Kc 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/RE-MARKING THE TEMPORARY REFERENCE MARKS: The KODAK Concise TLX1.6 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 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 semivisible markings use a felt pen to mark a spot over the + symbols, and trace the progressive markings using Page 2 of 5 TIP 268 Feb 2011

3 the KODAK Concise TLX1.6 Lens Verification Mask or the Center/Sizing chart. Use the fitting cross to accurately optimize optics during final fitting of KODAK Concise TLX1.6 Lenses. FINING AND POLISHING: Processing the TLX1.6 Lens is similar to the CR-39 lens material. Safety bevel the lens before fining to alleviate chips and 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. We strongly recommend fining pads with eight or more petals be used for curves over 9.00 diopters. This can prevent flares and wrinkles. ABRASION-RESISTANT COATINGS: The front surface has the protection of a non-tintable anti-scratch coating. Signet Armorlite recommends using either a tintable or non-tintable backside coating after surfacing. Verify that the impact resistance is maintained, particularly when using a non-tintable coating. IMPACT RESISTANCE: Our test results indicate that lenses backside coated with UVX by Ultra Optics, UVNVS by Ultra Optics, or HT1000 by Gerber Coburn exceed the FDA impact-resistance requirements and are 100% compatible with the KODAK Concise TLX1.6 Lens. Contact our Technical Service Department if you are using a different coating. EDGING: 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. AR COATING: Multi-layer AR coatings can be applied to KODAK Concise Lenses. Because lens impact resistance is reduced by AR coatings, we recommend a 1.7mm minimum center thickness and a backside coating that will enhance the impact resistance capability. Be sure that your AR coating is compatible with your backside coating. Include impact testing for lenses AR coated and sold by your lab. It may be necessary to increase the minimum center thickness in order to meet impact resistance requirements. Please call Technical Services at for additional information about coatings and impact resistance. TINTING: To achieve a gray tint the lens color can be adjusted with G-15 green dye. The resin naturally absorbs more blue which requires compensation in other colors. Special 1.6 high index tints are available from most tint supply companies. When a tintable backside coating is used, tint performance and compatibility with specific neutralizers are coating dependent. NEUTRALIZING: After neutralizing the TLX1.6 lenses, you may see surface irregulatrities. If the lenses are being retinted a different shade, these surface irregularities will disappear while tinting. If the lenses will not be retinted, warm the lens with dry heat from a lamp or oven for 10 to 30 minutes to remove the irregularities caused by neutralizer. Always limit the exposure to neutralizer to 20 minutes at 200 degrees. THERMAL STABILITY: KODAK Concise TLX1.6 Lenses may warp while under pressure when exposed to temperatures over 150 F. Warpage can cause a plastic lens to become loose in the frame. If the lens should become warped beyond tolerance, place the lens on a flat tray in a oven at 200 F for approximately 5 minutes or until the lens is heated all the way through, causing it to relax to its original shape. Page 3 of 5 TIP 268 Feb 2011

4 FITTING AND FRAME SELECTION: Our minimum fitting height (sometimes called the segment height) 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 Mono PD 28 Mono PD Fit point Fit point Usable full addition point inside frame Unusable full addition point inside frame Kodak is a trademark of Kodak, used under license by Signet Armorlite, Inc. Concise and TLX1.6 are trademarks of Signet Armorlite, Inc. CR-39 is a registered trademark of PPG. Page 4 of 5 TIP 268 Feb 2011

5 SPHERE Kodak Concise TLX 1.60 Progressive Base Curve Selection Chart CYLINDER Base Base Base Base Base Beyond Normal Tooling Range Page 5 of 5 TIP 268 FEB 2011