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| Launch of the GDxPRO: Look Beyond Thickness |
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We are very excited about the release of the new GDxPRO, the world’s only Scanning Laser Polarimeter. New research has indicated that Scanning Laser Polarimetry (SLP) doesn’t just measure RNFL thicknes; it also measures the structural organisation of the RNFL which may precede changes in thickness1. This quality is referred to as RNFL Integrity or RNFL-I™.
SLP works by passing polarised light through the RNFL, which creates a high resolution map of over 32,000 data points. As the polarised light passes through the RNFL, a phase shift occurs. This is because light polarised parallel to RNFL micro-structures travels more slowly than light polarised perpendicular to them. The size of the shift, termed birefringence, depends on both the thickness of the RNFL and the cumulative level of organisation of its microstructures (hence RNFL Integrity).
The practical advantage of SLP is that it has been shown to have superior performance in assessing patients suspected of having glaucoma2, which is of course why it is so valuable in the clinical setting.
 | | The GDxPRO has several advancement on it’s predecessor with the addition of a number of new features. Two features of note are the addition of Enhanced Corneal Compensation (ECC) and Guided Progression Analysis (GPA). |
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Enhanced Corneal Compensation (ECC)
ECC is a new signal processing algorithm which increases the signal-to-noise ratio of the scans, thus increasing the diagnostic accuracy of the device3 and virtually wiping out atypical scans as was seen in a small percentage of patients with the GDxVCC4.
Guided Progression Analysis (GPA)
Guided Progression Analysis (GPA) is software that helps clinicians to follow glaucoma patients and identity fast progressors in need of more aggressive treatment.
GPA identifies statistically significant, reproducible change in focal, regional, and difficult to identify diffuse global defects and the results are presented in a single-page report that can be read intuitively at a glance or exported electronically.
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| GPA Report |
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The GDxPRO replaces the very successful GDxVCC. Download a comparison Sheet (618kB).
Download a GDxPRO (1,350kB) brochure
Reference:
1. Fortune B, Cull GA, and Burgoyne CF. Relative course of retinal nerve fiber layer (RNFL) birefringence, RNFL thickness and retinal function changes after optic nerve transaction. Invest Ophthalmol Vis Sci. 2008; 49: 4444–4452.
2. Medeiros FA, Vizzeri G, Zangwill LM, Alencar LM, Sample PA, Weinreb RN. Comparison of retinal nerve fiber layer and optic disc imaging for diagnosing glaucoma in patients suspected of having the disease. Ophthalmology, 2008; 115: 1340-6.
3. Mai, T.A et al. Diagnostic Accuracy of Scanning Laser Polarimetry with Enhanced versus Variable Corneal Compensation. Ophthalmology.2007
4. Sehi, M et al Scanning laser polarimetry with variable and enhanced corneal compensation in normal and glaucomatous eyes. Am J Ophthalmol 2007;143:272-279
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Visit us at both the:
SRC | 16th – 18th May & ODMAFair | 10th – 12th July
to find out about our conference deals including special interest rates in conjunction with Investec Experien. In particular, ask us about our specials on our OCT technology; it might be more affordable than you think. |
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Editor: Matthew Wensor
Product Manager
Ophthalmic Systems
Medical Business Group
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| Ph: 02 9020 1333 |
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