OptiSpheric IOL & OptiSpheric IOL PRO 2. ISO compliant IOL testing
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1 OptiSpheric IOL & OptiSpheric IOL PRO 2 ISO compliant IOL testing
2 OptiSpheric IOL Series Contents OptiSpheric IOL Series 3 Page Measurement Technology 4 OptiSpheric IOL 6 Key Features...6 Measured Parameters...6 Upgrades and Accessories...6 Self-Centering Lens Holder for Measurements in Air...6 Standard Model Eye...7 Advanced Model Eye...7 OptiSpheric IOL PRO 2 8 Key Features...8 Measured Parameters...8 Upgrades and Accessories...8 Trays for OptiSpheric IOL PRO Model Eyes for OptiSpheric IOL PRO Software for OptiSpheric IOL and OptiSpheric IOL PRO 2 10 Key Features of the OptiSpheric IOL Software...11 Overview Technical Data 11 2
3 OptiSpheric IOL Series OptiSpheric IOL Series Fully Automated IOL Testing in compliance with ISO Furthermore, the technology used by the OptiSpheric IOL allows measuring all modern types of IOLs: monofocal, multifocal bifocal or trifocal, with any type of structure (refractive, diffractive, sectors), toric, multifocal toric, spheric or aspheric designs. And of course it measures all type of materials - PMMA, hydrophobic, hydrophilic- in air or in situ according to the ISO standard. The OptiSpheric IOL Series comprises two products: The OptiSpheric IOL for the measurement of single IOL The OptiSpheric IOL PRO 2 for the fully automated and fast measurement of batches with up to 100 IOLs per batch. OptiSpheric IOL PRO 2 for fully automated measurement of IOL batches The OptiSpheric instrument is the industry s standard for lens parameters testing. With more than 500 installed units worldwide, it is used to fully measure and qualify optical components and systems. The products of the OptiSpheric IOL Series rely on this experience as well as on the experience TRIOPTICS gained in the field of intraocular lenses testing. With a technology following the guideline provided by the ISO 11979, we ensure a perfect transparency of the measurement process and a traceability of the measurement results. OptiSpheric IOL for measurement of single IOLs 3
4 Measurement Technology Measurement Technology Measurement Technology According to ISO The OptiSpheric IOL bench is using the imaging of an object through the lens under test. The resulting image is analyzed in order to evaluate the parameters of the lens (Power, Imaging quality through MTF calculation, energy distribution, Strehl ratio, and more ). Using this imaging technique is similar to realistic conditions and allows testing any type of IOLs designs. Different types of target are projected to infinity through a collimator. The lens under test gives therefore an image of the target in its focal plane. A measuring CCD microscope is used for analyzing the image by the help of an autofocus mechanism. The instrument also includes different aperture sizes and different imaging objectives chosen automatically by the system according to the power of the lens under test. The wavelength used for the measurement is 546 nm as requested in the ISO standard. Power measurement principle CCD Camera Microscope IOL in Model Eye Collimator Power, Add power and Cylinder are measured from the magnification of a double slit test target. The Powers are determined in each focal planes of the IOLs, two different focal planes in case of a bifocal lens, two different crossed focal planes in case of a toric lens, four different focal planes in the case of a bifocal toric IOL, etc The Add Power is calculated by subtraction of the Near and Far Powers and the Cylinder is calculated by subtraction of the crossed directions powers of a toric lens. Reticle Changer nm Filter Light Source Fig. 1: Setup for measurement in situ 4
5 Measurement Technology MTF measurement principle The measurement of the imaging quality is done through the evaluation of the Modulation Transfer Function (MTF). This objective and accurate method gives a full frequency resolved measurement of the optical quality. to use a cross (i.e. two perpendicular slits) giving the MTF in two image directions simultaneously or a pinhole giving as image a Point Spread Function (PSF) containing the complete MTF information in all directions. Transmission of object Optics / sample Intensity in the image plane Fig. 2: A perfect grid pattern is imaged through the sample into the image plane The OptiSpheric IOL measures the MTF on axis. It uses a single illuminated slit as object which is imaged on the focal plane of the sample. Due to diffraction and aberrations, there will not be a perfect slit image in this plane but a broadened slit, the so called Line Spread Function (LSF). The Fourier analysis of the LSF, giving the contribution of each spatial frequency, corresponds to the MTF of the sample. Alternatively to a slit it is also possible Transmission of object Optics / Sample Intensity in the image plane Contrast Diffraction limit Measured MTF Fig. 4: The image of a narrow slit is called "Line Spread Function" Cut off frequency Line Pairs/ mm Fig. 3: MTF = Contrast vs. spatial frequency. This figure shows the MTF of a diffraction limited optics and a measured MTF 5
6 OptiSpheric IOL OptiSpheric IOL OptiSpheric IOL Quality Check According to ISO OptiSpheric IOL is TRIOPTIC s established solution for the measurement of power and MTF of single IOLs. The instrument measures all kinds of IOL lenses. Key Features Measurement set-up and principle according to ISO Traceability to NPL and NIST international standards Measurement of monofocal, spherical and aspherical lenses Measurement of bifocal IOLs: diffractive, refractive, sectors Measurement of trifocal IOLs Measurement of polyfocal or adaptative IOLs Hydrophobic and hydrophilic measurements in air or in situ in model eye according to ISO Automated and accurate autofocus Automated target changer Flexible software with easy production mode or advanced users script programming Measured Parameters OptiSpheric IOL for the measurement of single lenses Back Focal Length (BFL) Through focus scans Relative transmission Energy distribution and Strehl ratio Upgrades and Accessories The OptiSpheric IOL can be delivered with the following accessories: When measuring in air, the IOL is placed in a suitable holder designed for different kinds of IOL sample diameters and haptic shapes. OptiSpheric IOL measures the following parameters: 6 Effective Focal Length (EFL) Power, Add power, Cylinder Modulation Transfer Function (MTF) Point Spread Function (PSF) Cylinder axis, orthogonality and toric marks recognition Radius of curvature Self-Centering Lens Holder for Measurements in Air
7 OptiSpheric IOL 3mm Aperture Saline Water n = T = 35 C 7 8 IOL under Test 9 Image Plane Model Cornea (Achromatic Doublet) Parallel Plates (BK7) Fig. 5: Model Eye for Measurements in Situ Standard Model Eye The aperture of typically 3 mm can be adjusted to diameters from 1 to 6 mm. The IOL holder is clamped by a self-centering mount equipped with accurate centering adjustment. When measuring in situ, the IOL lens is inserted into a model eye simulating the effect of the human eye. Two types of model eyes are available, both are compliant to the ISO Standard. The IOL is placed in saline solution between two parallel plates on a sample holder including the aperture stop. An achromatic doublet simulates the eye cornea. The model cornea can be easily exchanged allowing the use of different cornea designs, e.g.cornea with spherical aberrations. The advanced model eye contains a heater for measurements at 35 C. Furthermore it offers the following advanced adjustment features: Translation in X and Y directions of the sample inside the model eye Translation in X and Y directions of the complete model eye regarding to the optical axis Aperture size modification with the use of different lens holders Easily removable cornea lens with sliding holder Possibility to tilt the IOL holder up to 5 to simulate the behaviour of a tilted IOL when inserted in the eye The standard model eye used with the Opti- Spheric IOL single lens instrument includes a threaded cornea which can be easily removed for Power measurements or put back for MTF measurement. It is fixed with the selfcentering mount. Advanced Model Eye 7
8 OptiSpheric IOL PRO 2 OptiSpheric IOL PRO 2 Fast and Automated IOL Batch Testing According to ISO OptiSpheric IOL PRO 2 for automated batch testing OptiSpheric IOL PRO 2 is a fully automated optical test station designed and optimized for use in production. All measurements are done in compliance with the ISO standard, for all types of IOLs: monofocal, multifocal (diffractive, refractive), trifocal, toric, aspheric. Key Features High throughput batch measurement with up to 100 lenses per batch Motorized model cornea for automated testing with up to three different corneas Aperture changer with multiple aperture sizes Automated objective changer Measurement of toric lenses independent of the orientation Hydrophobic and hydrophilic measurements in air or in situ in model eye tray according to ISO Traceability to international standards NPL and NIST Stand-alone instrument with small foot print (90x90 cm) including all accessories and the computer Flexible software with easy production mode or advanced users script programming Measured Parameters The following parameters of monofocal, multifocal, toric and aspherical lenses can be measured: Effective Focal Length (EFL) Power, Add power, Cylinder Modulation Transfer Function (MTF) Point Spread Function (PSF) Cylinder axis, orthogonality and toric marks recognition Radius of curvature Back Focal Length (BFL) Through focus scans Relative transmission Energy distribution and Strehl ratio Upgrades & Accessories 8 TRIOPTICS offers trays for in situ and in air measurement. The in situ tray is designed in compliance with ISO and contains up to 100 lenses per batch.
9 OptiSpheric IOL PRO 2 It is also possible to make single lens testing with the OptiSpheric IOL PRO 2. As the motorized cornea is already included with the instrument, only a simple wet cell is necessary. It is located on an adapted tray automatically centered on top of the motorized model cornea. This model eye can be provided with a heater in order to measure at 35 C. In situ tray with batch of 100 lenses OptiSpheric IOL PRO 2 with model eye for single lens testing OptiSpheric IOL PRO 2 testing a batch of IOLs in air Single seat model eye for OptiSpheric IOL PRO 2 OptiSpheric IOL PRO 2 testing a batch of IOLs in situ 9
10 Software OptiSpheric IOL / IOL PRO 2 Software for OptiSpheric IOL and OptiSpheric IOL PRO 2 The advanced software is designed to work with Windows operating systems for easy and intuitive operation. Its flexible interface allows users with different experience working comfortably with the software. It offers a high level of speed and accuracy and provides consistent, reliable results. All aspects of data acquisition, data calculation and data display are under software control. The software package provides menu-driven operator guidance and advanced data management following the requirements of the Food and Drugs Administration (FDA) for Electronic Records. Key Features of the OptiSpheric IOL Software Flexible and modular friendly user interface adaptable to different users Predesigned measurement sequences depending on the IOL type Only a few clicks to start a fully automated alignment and measurement of batches of 100 IOLs High accuracy and repeatability Real-time camera and graph display (MTF, Through Focus, LSF, PSF) Advanced result correction (temperature C, defocus) Database communication, bar code reader, dynamic tolerancing Multi language support Fully automated hardware control Automatic search of the focal planes Advanced user mode allowing for user defined scripts describing the measurement process 10 Fig. 6: OptiSpheric IOL Software with a production oriented interface
11 Software OptiSpheric IOL / IOL PRO 2 Fig. 7: OptiSpheric IOL Software with an advanced user interface showing the script and graphs Overview Technical Data Power Accuracy 0.05D OptiSpheric IOL OptiSpheric IOL PRO 2 Power Range With model cornea: -200D to +150D Without cornea: -50D to -2.5D and +3D to +125D Power resolution 0.005D MTF Accuracy ±2% (0-300 lp/mm) MTF Range With cornea: -200D to +150D Radius and BFL Accuracy 10 µm <5 µm Apertures diameter Measurement time (Monofocal with model cornea) 1 to 6 mm with steps of 0.5mm 12 sec for one IOL 12 Min for 100 IOLs 11
12 TRIOPTICS GmbH. Optische Instrumente Hafenstrasse Wedel / Germany Phone: Fax: info@trioptics.com TRIOPTICS GmbH. All rights reserved
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