Scanning laser polarimetry (SLP) was developed to provide objective assessment of the retinal nerve fiber layer (RNFL), a birefringent tissue, by measuring the total retardation in the reflected light. The birefringence of the anterior segment of the eye, mainly the cornea, is a confounding variable to the RNFL measurement. Anterior segment birefringence varies over a wide range among individua...

PURPOSE To determine the correlations between structural parameters of the optic nerve head and the retinal nerve fiber layer (RNFL) obtained by using a Heidelberg Retina Tomograph II (HRT II), optic coherence tomography (OCT), and laser polarimetry (GDX-VCC) and the perimetric indices of standard automated perimetry (SAP) in normal, ocular hypertensive and glaucomatous subjects. METHODS Thre...

AIMS To establish whether the structural parameters provided by the Heidelberg retina tomograph (HRT) and the laser diagnostics glaucoma scanning system (GDx) can be used to reflect functional damage in the visual field. METHODS 62 patients with primary open angle glaucoma underwent examination with the HRT, GDx, and Humphrey field analyser. The relations between the topographic parameters, r...

PURPOSE To evaluate the ability of scanning laser polarimetry with variable corneal compensation to detect progressive retinal nerve fiber layer (RNFL) loss in glaucoma patients and patients suspected of having the disease. METHODS This was an observational cohort study that included 335 eyes of 195 patients. Images were obtained annually with the GDx VCC scanning laser polarimeter, along wit...

AIM To compare the results of scanning laser polarimetry (GDx) with variable corneal compensation (VCC) and enhanced corneal compensation (ECC) when applied to myopic glaucomatous eyes. METHODS Forty glaucoma eyes with moderate myopia (between -3 and -6 D) and 35 glaucoma eyes with high myopia (-8 D or greater) were enrolled in this study. GDx VCC, GDx ECC and standard automated perimetry (SA...

In 2001, a team of researchers at IBM published a paper in IJCAI which reported on the first experiments that systematically studied the interactions of human traders and software-agent traders in electronic marketplaces running the continuous double auction (CDA) mechanism. IBM found that two software-agent strategies, known as GD and ZIP, consistently outperformed human traders. IBM's results...

Perinatal exposure to testosterone (T), which can act upon both the androgen receptor (AR) and, via aromatization of T into estrogens, upon estrogen receptors, organizes many adult behaviors in rodents. We compared behaviors in wild-type (WT) male rats and AR-deficient rats with the testicular feminization mutation (Tfm), which on the day of birth were either gonadectomized (Neo-Gdx) or sham op...

OBJECTIVE To evaluate morphological parameters of optic disc and retinal nerve fiber layer (RNFL) examined with confocal laser tomography (HRT3) and laser polarimetry (GDx-VCC) in a normal population, and analyze correlations of these parameters with demographic variables. PATIENTS AND METHODS Cross-sectional study in the context of a glaucoma screening campaign in the primary care center of ...

PURPOSES To evaluate the retinal nerve fiber layer using GDx in chronic alcohol and tobacco users. METHODS Twenty-three chronic alcohol and tobacco users were studied (study group). As a control group, sixteen volunteers without use of alcohol and tobacco with similar characteristics (age, gender and race) were included. Both eyes were tested for analysis of the retinal nerve fiber layer with...