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Implementing ISO-Compliant IOL
Inspection in Your Production
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Precise testing of flange focal length of miniature objective lenses
OptiSpheric®
The standard for comprehensive testing of optomechanical parameters of lenses
OptiSpheric® is the industry standard for non-contact inspection of basic axial optical and mechanical parameters and is used worldwide to fully measure and qualify single lenses – as well as intraocular lenses – and optical systems. The world’s largest laboratories and major optics manufacturers rely on TRIOPTICS optical inspection systems.
They use the OptiSpheric® for reliable and reproducible axial measurement of effective focal length, back focal length, flange focal length, radius of curvature and modulation transfer function (MTF). Different product variants are available that are optimized for different applications and simplify the measuring process: manual or automated processes in different measuring ranges, the combination with OptiCentric®, measurement at further wavelengths and in-air and in-situ measurement for intraocular lenses. The easy-to-use software allows accurate measurement of the test samples at any time.
Reliable & traceable
The extensive spectrum of measured values can be determined with highest accuracy up to 0.03 %. The measuring accuracy is traceable to international standards.
User-friendly & fast
The measurement, which takes only a few seconds, is easy to start and ensures a high test sample throughput. The exact autofocus scan also makes the measurement user-independent and objective.
Efficient
The measurements can be efficiently designed through individual processes and the user-specific selection of the measurement parameters.
Product Overview
OptiSpheric® MAN
Manual measurement
The manual OptiSpheric® MAN allows easy measurement of optomechanical lens and objective properties.
- Manual focusing
- Focal length measurements of up to ±250 mm
Measurement of back focal length (BFL) as well as flange focal length (FFL) and curvature radius from ±5 mm up to ±250 mm
OptiSpheric® AF
The standard for testing lenses
The automated OptiSpheric® AF enables fast and reliable test results in automated test sequences.
- High precision autofocus
Measurement of back focal length (BFL) as well as flange focal length (FFL) and curvature radius from ±5 mm up to ±490 mm
OptiSpheric® AF 500:
- Focal lengths from -450 mm to +500 mm.
- Cut-off width, contact dimensions and radius of curvature from ±5 mm to ±490 mm
OptiSpheric® AF 1000
- Focal lengths up to ±1000 mm.
- Focal length, contact dimensions and radius of curvature from ±5 mm up to ±490 mm.
OptiSpheric® AF 1500
- Focal lengths up to ±1500 mm.
- Focal length, contact dimensions and radius of curvature from ±5 mm to ±790 mm
OptiSpheric® AF 2000
- Focal lengths up to ±1500 mm.
- Focal length, contact dimensions and radius of curvature from ±5 mm up to ±990 mm.
OptiSpheric® AF 500 INV
Measure EFL & FFL fast and accurate
The OptiSpheric® AF 500 INV is the specialist for measuring camera lenses due to its inverse design.
- Automated focusing
Focal length measurement up to +500 mm
Measurement of back focal length (BFL) as well as flange focal length (FFL) and curvature radius from +5 mm up to +490 mm
Quality control of lenses up to 300 mm long
Compressed air dampened granite table allows for measurements independent of the environment
High measurement accuracy of BFL, FFL and ROC through the use of precise length measurement
High repeatability through the use of exact linear axes
Stable and precise placement of the camera lens through the use of customer-specific bayonet connections and manual XY displacement
Fast intermediate testing of single elements via a self-centering, customer-specific and easily exchangeable holder
Compact, sturdy and independent measurement station without externally moving parts for secure handling
OptiSpheric® HR
Highly precise measurement of short EFL & FFL
OptiSpheric® HR is designed for high precision measurement of flange focal length for short focal length lenses.
Focal length measurement from 0.3 mm to 12 mm
Flange and back focal length measurement between -5 mm and +40 mm
Precise positing of the measuring head allows high measurement accuracy for flange and back focal length of ±4 µm
High repeatability of flange and back focal length of 2 µm
Reproducible positioning of the sample directly on the reference surface for FFL measurement
Easy and secure sample positioning on a customer-specific holder
Flexible software enables the configuration of individual measuring sequences
Adjustable wavelength with VIS an NIR filters
OptiSpheric® IOL R&D
Comprehensive testing of IOLs in R&D
The OptiSpheric® IOL R&D allows the testing of intraocular lenses in research and development.
- Quick testing of single lenses in just 12 seconds
- ISO-compliant measurement of hydrophobic and hydrophilic lenses in air or in a heatable in situ eye model according to ISO 11979
Power measurement with an accuracy of 0.3 % for all types of intraocular lenses
Power (sphere, cylinder und addition)
Effective focal length (EFL)
Modulationtransferfunction (MTF and 2D-MTF)
Pointspreadfunction (PSF and LSF)
Orientation of the cylinder axis, orthogonality of the optical axis and deviation of the markers from the optical axis
Radius of curvature (in air)
Back focal length (BFL, in air)
MTF focus scan („Through Focus Scan“)
Energy distribution (MTF area)
Streh ratio
Visual inspection
The measuring systems are universally applicable for all types of intraocular lenses (monofocal, spherically aberrated lenses (EDOF), multifocal, trifocal, toric and aspherical IOLs (each diffractive, refractive or sector lens)) and allow the traceability of the measurement results to international, independent testing institutes such as NPL and NIST.
OptiSpheric® IOL PRO 2
Fully automated IOL measurement
OptiSpheric® IOL PRO 2 enables the inspection of intraocular lenses in production.
High throughput with up to 100 lenses per tray
- ISO-compliant measurement of hydrophobic and hydrophilic lenses in air or in a heatable in situ eye model according to ISO 11979
Power measurement with an accuracy of 0.3 % for all types of intraocular lenses
Power (sphere, cylinder und addition)
Effective focal length (EFL)
Modulationtransferfunction (MTF and 2D-MTF)
Pointspreadfunction (PSF and LSF)
Orientation of the cylinder axis, orthogonality of the optical axis and deviation of the markers from the optical axis
Radius of curvature (in air)
Back focal length (BFL, in air)
MTF focus scan („Through Focus Scan“)
Energy distribution (MTF area)
Streh ratio
Visual inspection
The measuring systems are universally applicable for all types of intraocular lenses (monofocal, spherically aberrated lenses (EDOF), multifocal, trifocal, toric and aspherical IOLs (each diffractive, refractive or sector lens)) and allow the traceability of the measurement results to international, independent testing institutes such as NPL and NIST.
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Software
OptiSpheric® Software
Simple and intuitive operation
The proven OptiSpheric® software meets the requirements of optical manufacturing in terms of simple and intuitive operation. It fulfills the highest demands for measurement speed and precision while providing consistent, reliable measurement results. The standard measuring sequences are supplemented by the possibility of configuring individual measuring sequences.
The software is convincing in many respects:
- Comprehensive, reliable functionalities that can be used both in production and in research and development
- Optimization of the test sequence through customer-specific programming of measurement and analysis sequences using script tooling – ideal for R&D laboratories
Fast working thanks to optional automated positioning of the appropriate reticle for the current application
Usage for IOL measurement
The software has been specially adapted for use in the field of IOL measurements.
Here it offers:
- Simple operation through predefined measurement processes for various IOL types
- Easy system setup with just a few clicks to start the fully automated alignment and measurement of batches with up to 100 IOLs
- Flexible, modular menu navigation that can be set up for different users (R&D, production, administrator)
Easy-to-understand measurement results with graphics displays and depiction of the camera image in real time
Software-based correction of the refractive power in the event of temperature differences, defocusing and/or spherical correction
Efficient data input and output by means of database communication and optional link to barcode reader
Different modes permit, for instance, the preparation of individual measurement scripts
Technical Data
| Parameter | OptiSpheric® Manual focusing, automated measurement | OptiSpheric® Auto Focus 500 automated measurement | OptiSpheric® Auto Focus 1000 automated measurement | OptiSpheric® Auto Focus 1500 automated measurement | OptiSpheric® Auto Focus 2000 automated measurement |
|---|---|---|---|---|---|
| Lens diameter | 3 mm ... 35 mm optional: 5 mm ... 75 mm | 3 mm ... 35 mm optional: 5 mm ... 75 mm | 5 mm ... 75 mm optional: 3 mm ... 35 mm | 5 mm ... 75 mm optional: 3 mm ... 35 mm | 5 mm ... 75 mm optional: 3 mm ... 35 mm |
| Clear aperture | 28 mm | 28 mm | 48 mm | 48 mm | 48 mm |
| EFL (Effective Focal Length) | +5 mm … +250 mm -5 mm … -250 mm | +5 mm … +500 mm -5 mm … -450 mm | +5 mm … +1,000 mm -5 mm … -1,000 mm | +5 mm … +1,500 mm -5 mm … -1,200 mm | +5 mm … +2,000 mm -5 mm … -1,500 mm |
| Measurement range BFL and radius | ±5 mm … ±250 mm | ±5 mm … ±490 mm | ±5 mm … ±490 mm | ±5 mm … ±690 mm | ±5 mm … ±1,000 mm |
| MTF | absolute MTF-Test: 5 mm … 50 mm EFL | absolute MTF-Test: 5 mm … 50 mm EFL | absolute MTF-Test: 5 mm … 50 mm EFL | absolute MTF-Test: 5 mm … 50 mm EFL | absolute MTF-Test: 5 mm … 50 mm EFL |
| Parameter | OptiSpheric® AF 500 INV |
|---|---|
| Lens diameter 1) | 5 mm … 75 mm |
| EFL (Effective Focal Length), relative MTF: range | +5 mm … +500 mm 3) |
| EFL, relative MTF: measurement accuracy 2) | 5 mm … 25 mm: 0.1 % … 0.3 % 25 mm ... 500 mm: 0.03 % … 0.1 % 500 mm … 1000 mm: 0.05 % … 0.3 % |
| EFL, relative MTF: measurement time | First measurement: 5 s … 8 s consecutive measurements : 3 s … 5 s |
| BFL, FFL, radius: range | +5 mm … +490 mm |
| BFL, FFL, radius: repeatability 2) | 0.02 % ... 0.2 % |
| BFL, FFL, radius: accuracy 2) | 0.03 % ... 0.3 % |
| MTF up to 150 lp/mm: range | 5 mm … 75 mm EFL (Effective Focal Length) |
| MTF up to 150 lp/mm: test mode | Axial MTF measurement automatic auto focus |
| MTF up to 150 lp/mm: spatial frequency | 0 lp/mm … 500 lp/mm |
| MTF up to 150 lp/mm: repeatability 2) | 1 % |
| MTF up to 150 lp/mm: accuracy 2) | 2 % |
| Wavelength | 546 nm 4) |
| Dimensions (h x w x d) | 1,950 mm x 1,205 mm x 700 mm |
| Weight | 280 kg |
| Type | Stand alone device |
1) Sample holder for other lens diameters upon request
2) Depending on NA of sample; higher NA reduces accuracy; sample NA should be smaller than NA of the measurement head
3) Negative measurement range upon request
4) Other wavelengths (e.g. 480 nm, 658 nm) upon request
| Parameter | OptiSpheric® HR |
|---|---|
| EFL measurement range | 0.3 mm to 12 mm |
| EFL measurement accuracy 1) | +0.5 mm … +3 mm: ±5 μm +3 mm … +12 mm: 0.2 % |
| EFL repeatability 1) | +0.5 mm … +3 mm: < ±5 μm +3 mm … +12 mm: < 0.2 % |
| FFL measurement range | -5 mm to +40 mm |
| FFL measurement accuracy | ±4 μm (2 sigma) |
| FFL repeatability | 2 μm |
| BFL measurement range | -5 mm to +40 mm |
| BFL measurement accuracy | ±4 μm (2 sigma) |
| BFL repeatability | 2 μm |
| MTF measurement range | up to 150 lp/mm |
| MTF measurement accuracy 1) | ±2 % MTF |
| MTF repeatability 1) | ±1 % MTF |
| Dimensions (W x H x D) | approx. 500 mm x 1100 mm x 570 mm |
| Weight | 40 kg |
| Type | Tabletop device |
1) For NA < 0.28; Depending on NA of sample: higher NA reduces accuracy
| Parameter | OptiSpheric® IOL R&D | OptiSpheric® IOL PRO 2 |
|---|---|---|
| Power range | • Water labelled, measured in air: -16.5 D ... -1 D and +1 D ... +41 D • Water labelled, measured in water: -50 D ... -2.5 D and +3 D ... +125 D • Water labelled, measured with model cornea: -200 D ... +150 D | • With model cornea: -200 D ... 0 D and 0 D ... +150 D • Without model cornea: -50 D ... -2.5 D and +3 D ... +125 D |
| Power accuracy | 0.3 % | 0.3 % |
| MTF range | • Water labelled, measured in air: +7 D ... +41 D • Water labelled, measured in water: +20 D ... +125 D • Water labelled, measured with model cornea: -45 D ... +45 D | • With model cornea: -200 D ... 0 D and 0 D ... +150 D • Without model cornea: -50 D ... -2.5 D and +3 D ... +125 D |
| MTF accuracy | ±2 % (0 ... 300 lp/mm) | ±2 % (0 ... 300 lp/mm) |
| Apertures diameter | 1 mm ... 6 mm with steps of 0.5 mm | 1 mm ... 6 mm with steps of 0.5 mm |
| Radius and BFL accuracy | 20 µm | 10 µm |
| Max. batch size | 1 | 100 |
| Sample positioning | Manual | Automatic |
| Dimensions (h x w x d) | 1,120 mm x 560 mm x 580 mm | 1,850 mm x 860 mm x 860 mm |
| Weight | 45 kg | 300 kg |
| Type | Table top device | Stand alone |
Upgrades & Accessoires
Lens holders
- Self-centering holders for lenses with an outer diameter from 3 mm to 35 mm with X-Y shifting device
- Self-centering holder for lenses with an outer diameter from 5 mm to 75 mm with X-Y sliding device
Measuring range and referencing
- Further optical attachments for the extension of the measuring ranges
- The OptiSpheric® is also available as a module for the OptiCentric®.
- Reference lenses
Illumination
- Additional light source for simplified BFL, FFL and curvature radius measurement
- Filter for measurement at further wavelengths
Self-centering seat for lens holder for measurement in air
Lens holder with various aperture sizes (3 mm standard, 1 mm – 6 mm optional)
Advanced model eye including replaceable model cornea, heating, X-Y displacement for cornea and lens, tilting adjustment by up to 5° to simulate a tilting positioning after implantation
Tray with self-centering holder for the measurement of single lenses and glass reference lenses in air
Tray for the measurement of 100 lenses in air
Model eye for in situ testing of single lenses with a tray
In situ tray for the measurement of 100 lenses
SortStation IOL for simple, fast and safe execution of all work steps upstream and downstream of the measurement:
- Loading of the trays:
The ideal positioning of the lenses is easily visible thanks to optimum illumination. - Sorting of the lenses after the measurement:
The test results are automatically transferred to the display and made visible directly at the location of the samples. The fulfilment of the pass/fail criterion is displayed in a green/red color scheme and the reliable assignment of each lens is made possible.
WorkStation IOL
The Workstation IOL is a complete workplace in which the Sortstation IOL is integrated. With its storage space for unused trays and other accessories, the Workstation IOL keeps everything in order. Drawer inserts support safe and organized storage. With the corresponding holder, the in-situ trays can be easily and safely set up for drying.
Customized lens holder
Others:
- Heating for model eye
- Corneas of various designs, e.g. with spherical aberration
- High-performance LED (light source)
- Customized lens holder for tray
- Filters for measurements at various wavelengths and photopic lighting
- High-resolution camera
Knowledge Base
Measurement of ophthalmic lenses
Measurement of power, add power and cylinder in compliance with ISO 11979
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 11979 standard.
More knowledge for experts
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Power measurement principle
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.
Setup for in-situ measurement
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.
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 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.
The image of a narrow slit is called “Line Spread Function”
A perfect grid pattern is imaged through the sample into the image plane
MTF