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| ATLAS 9000 Corneal Topographer |
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The ATLAS 9000 corneal topographer collects high quality data using Placido-ring technology. Two unique applications include assisting in the selection of aspheric IOLs using corneal wavefront analysis and automatically classifying corneas into clinical categories.
Corneal Wavefront analysis
The ATLAS 9000 features corneal wavefront analysis that can be used to choose the correct aspheric IOL for each particular patient’s needs. It does this by measuring the amount of each patient’s corneal spherical aberration so that the surgeon can correct for it by choosing the most appropriate aspheric IOL. See the following Presentation by Dr. Warren Hill for a detail description.
*Please note that Carl Zeiss IOLs are not sold in the U.S, and therefore are not mentioned in this U.S-based presentation.
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PathFinder II Corneal Analysis software
One of the most interesting and useful aspects of the ATLAS 9000 corneal topographer is the PathFinder II Corneal Analysis software. PathFinder II compares the measured corneal topography to an extensive clinical database and provides a probability that the topography exam falls into specific categories. This is an extremely useful aid to interpretation but how does it work?
In mathematical terms, PathFinder II incorporates a Support Vector Machine (SVM) algorithm that uses a clinical database to perform classification by constructing “multi-dimensional hyperplanes” to optimally separate the various corneal conditions to which it is trained. In other words, the SVM looks for common patterns in corneal topography maps compared to those in the clinical database and rates the likelihood it falls within predefined clinical categories.
Support Vector Machines have received widespread recognition for their ability to discover hidden relationships in complex datasets and have been implemented in numerous applications including image analysis and decryption. PathFinder II evaluates 12 different corneal parameters to classify the cornea into five categories: normal, suspect keratoconus, post-myopic laser vision correction, post-hyperopic laser vision correction or “other” corneal conditions.
The clinical database is made up of 369 eyes of 332 subjects and is made up of both normal and “abnormal” corneas. Thus it is referred to as a clinical database rather and a normative database.
Downloads:
Brochure: ATLAS 9000 (2,395kB)
Article: Novel Applications of ATLAS Corneal Topography for the Cataract Surgeon (234kB)
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ZEISS Symposium:
Innovations in Cataract and Refractive Surgery at AUSCRS 09
Date: 2 Jul 09
Time: 11:00am - 1:30pm
Venue: Mantra on the Esplanade, Darwin
Click here for full details
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Editor: Matthew Wensor
Product Manager
Ophthalmic Systems
Medical Business Group
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