For normal vs. early glaucoma, the parameter with the best AROC was Nerve fiber Key Words: GDx VCC polarimetry, glaucoma, retinal nerve fiber damage. PURPOSE: To evaluate the performance of the HRT II (Heidelberg retinal tomograph) and GDx (glaucoma detection) retinal nerve fibre. Eur J Ophthalmol. Mar-Apr;16(2) Glaucoma detection using the GDx nerve fiber analyzer and the retinal thickness analyzer (RTA). Hoffmann EM(1).

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Invest Ophthalmol Vis Sci. Although previous studies have shown the same trend, this is the first study to show a statistically significant difference between the 3 technologies.

Each subject underwent a detailed ophthalmic examination, including slit-lamp biomicroscopy, gonioscopy, pachymetry, Goldmann applanation tonometry, stereoscopic examination of the optic disc, and standard automated perimetry SAP, mode, Humphrey Field Analyzer, modelHFA; Carl Zeiss Meditec, Inc. Statistical analysis gxd the damage compared to normal values.

The circles represent the nerve. At what point might you order a GDx for a glaucoma patient? GDx VCC polarimetry, glaucoma, retinal nerve fiber damage.

That is my fear. Normal control eyes had normal findings in clinical examination, an intraocular pressure IOP not gdz 21 mmHg, no history of increased IOP, normal-looking optic nerve 12 intact rim, no evidence of hemorrhage, focal rim thinning, notching, glaucomatous excavation or RNFL defects and normal visual-field results.

GDx VCC imaging was performed by one experienced operator.

The influence of low to moderate myopia on retinal nerve fiber layer as assessed by scanning laser polarimetry with variable corneal compensator. GDx Nerve Fiber Analyzer.

Have they ever tried to do a high resolution CT scan of the optic nerve, like 1 mm, or maybe an MRI, to look at the nerves? Regarding the resulting GDx VCC parameters, there was a significant difference between the various groups for each parameter under consideration. Such damage to the nerve is irreversible. Some studies have evaluated the correlations between visual field indices and structural parameters.


But both are still experimental. Conclusions GDx-VCC-measured parameters may serve as a useful tool to distinguish normal from glaucomatous eyes; in particular, NFI turned out to be the best discriminating parameter.

Our current result is in agreement with previous reports that stated that, in glaucomatous eyes, there was a significant correlation between a visual field index MD and PSD and some of the parameters yielded by GDx VCC.

Which areas are affected first by glaucoma? On Wednesday, August 23,Dr.

The HRT and clinical exams do not require dilation. The optic nerve or the nerve fiber layer — sort of two sides of the same coin. glaucomx

A comparison of HRT II and GDx imaging for glaucoma detection in a primary care eye clinic setting.

The instrument, called GDx short for glaucoma diagnosisscans the glaufoma in approximately one second, creating a map detailing the retinal nerve fiber layer thickness of the central retina, in particular in the region surrounding the optic nerve. Atypical scans are scans with an atypical birefringence i. A framework for comparing structural and functional measures of glaucomatous damage. You can manage this and all other alerts in My Account.

GDx Nerve Fiber Analyzer – Glaucoma Service Foundation to Prevent Blindness

Moreover, there were similar problems during the image selection process. Related Topics How is Glaucoma Diagnosed? Assessment of the retinal nerve fiber layer.

Whether this is important is not yet determined, as far as I know. It is not always from glaucoma, so care must be taken. In all statistical analyses, we set significance at 0.

The correlation between the resulting parameters and the outcome of visual field testing was evaluated for the different subgroups of glaucomatous eyes. More work needs to be done, and the system has some problems that need to be ironed out. He was only diagnosed once he had lost all vision in one eye, while in the second eye he had significant damage to the nerve.


The colors are a computer enhancement of the thickness. The important clinical challenges in glaucoma are the detection of early glaucomatous damage and its progression over time. Diagnostic capability of optical coherence tomography in evaluating the degree of glaucomatous retinal nerve fiber damage.

Support Center Support Center. Retinal nerve fiber layer imaging compared with histological measurements in a human eye. Sorry to be dense. Each instrument was represented by the best composite scores that optimized use of diagnostic information.

GDx – Diagnosing Glaucoma with Imaging

Results For normal vs. Are both nerves damaged in that example? In the study conducted by Resu and Lemij, 5 they reported that the sensitivity of the NFI to identify glaucoma patients with mild, moderate, and severe damage was equal to You will receive an email whenever this article is corrected, updated, or cited in the literature. This cross-sectional study included 50 normal eyes from 50 normal subjects and glaucomatous eyes from glaucoma patients.

Care must be taken when interpreting the results. Clinical gllaucoma in glaucoma. Glaucoma is the number two cause of blindness in Israel today. What is the meaning of the colors and the green circle in the GDx example above? I am looking at that printout and have no idea what I am looking at.