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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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. The circles represent the nerve. Although previous studies have shown the same trend, this is the first study to show a statistically significant difference between the 3 technologies.
In addition, repeating measurements every few months to years enables us to monitor disease progression.
A comparison of HRT II and GDx imaging for glaucoma detection in a primary care eye clinic setting.
Permission to republish any abstract or glauucoma of an abstract in any form must be obtained in writing from the ARVO Office prior to publication. No, they just give different information about the same thing: The correlation between the resulting parameters and the outcome of visual field testing was evaluated for the different subgroups of glaucomatous eyes. Blaucoma, it is inevitable to suffer from an image selection bias in the context of a technical imaging study.
Open in a separate window. Does the HRT measure thickness at all?
Although we chose our glaucoma group according to an experienced doctor, it is inevitable that these patients were identified on the basis of particular patterns of structural and functional abnormalities that met gxx notions, which may result in a biased outcome of the comparison.
Eytan Blumenthal, and is provided to help glaucoma and cataract patients better understand their condition. The evaluation of glaucomatous visual field defects was made based on the following liberal criteria: Notice that the thickness is greater at the top and bottom of the nerve.
This is a test that has promise. National Center for Biotechnology InformationU. The machine provides, beyond actual thickness measurements, also a statistical analysis that indicates the level of damage in each area of the retina.
The NFI was the best discriminating parameter when it comes to differentiating normal from glaucomatous eyes.
Glajcoma evaluation of the optic nerve head. Add a Comment click here to cancel reply. GDx VCC imaging was performed by one experienced operator.
It may be most gvx in following patients over time to see if they are losing tissue at a rate faster than they should. Glaucoma detection using scanning laser polarimetry with variable corneal polarization compensation. Regarding the resulting GDx VCC parameters, there was a significant difference between the various groups for each parameter under consideration.
Do you need to have your eyes dilated for this? I think that the technicians are fine, but you just have to be careful.
It may be fine, but I would rather look at things like the area of the rim. Do you happen to know how the database for this program was set up? Methods This study included 44 normal eyes and glaucomatous eyes.
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. Discussion The important clinical challenges in glaucoma are the detection of early glaucomatous damage and its progression over time.
GDx Nerve Fiber Analyzer – Glaucoma Service Foundation to Prevent Blindness
All subjects underwent were assessed by means of the GDx VCC imaging technique within 3 months of the clinical examination and visual field testing. The nerve fiber layer is important because it is the tissue that the optic nerve is made of. Therefore, unfortunately, a significant number of patients are diagnosed in the advanced stages of the disease, after many years of damage to the optic nerve due to untreated elevated intra-ocular pressure.
A method of comparing the areas under receiver operating characteristic curves derived from the same cases. The area under the receiver operating characteristic AROC curve was used to assess the gddx of each parameter to differentiate normal eyes from glaucoma eyes, for each of the established glaucoma subgroups.
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Slope of the peripapillaty nerve fiber layer surface in glaucoma. Scanning Laser Polarimetry Measurements GDx VCC measurements were carried out by the same trained and experienced person that performed the visual field tests. They may be better than photos or fields for this, but the work to prove this is ongoing.
Inclusion criteria for the glaucoma groups included an intraocular pressure above 22 mmHg, an open angle, and a reproducible glaucomatous visual field defect in the absence of any other abnormalities that could explain that defect.
Glaucoma & Cataract, Prof. Eytan Blumenthal | Imaging the optic nerve in glaucoma
Third, the sample size is not large enough. Invest Ophthalmol Vis Sci, 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 gd to Graefes Arch Clin Exp Ophthalmol. Articles from Journal of Optometry are provided here courtesy of Elsevier.
Which areas are affected first by glaucoma? Many imaging technologies have been introduced for the objective assessment of the RNFL, such as scanning laser polarimetry GDxwhich estimates RNFL thickness by measuring the joint retardation of a polarized scanning laser beam.
Here, in the present work, we conducted a comparative study to evaluate RNFL thickness in normal eyes and in glaucomatous eyes in differing stages of the disease.
Glaucoms thinning may show up earlier than with a field test, but remember that until there is a field defect, you are unaware of a problem.