The objective of this study was to evaluate the relations among electroretinogram (ERG) parameters (cone a-wave, cone b-wave, and 30 Hz flicker), retinal thickness, and retinal volume in 16 patients with central retinal vein occlusion and macular edema. The amplitude and implicit time of the ERG parameters were extracted from the ERG traces. Retinal thickness and volume were measured by optical...

We say that a symmetric matrix A is copositive if vTAv ≥ 0 for all nonnegative vectors v. The main result of this paper is a characterization of the cone of feasible directions at a copositive matrix A, i.e., the convex cone of symmetric matrices B such that there exists δ > 0 satisfying A + δB being copositive. This cone is described by a set of linear inequalities on the elements of B constru...

We call A ⊂ En cone independent of B ⊂ En , the euclidean n-space, if no a = (a1, . . . , an) ∈ A equals a linear combination of B \ {a} with non-negative coefficients. If A is cone independent of A we call A a cone independent set. We begin the analysis of this concept for the sets P(n) = {A ⊂ {0, 1}n ⊂ En : A is cone independent} and their maximal cardinalities c(n) max{|A| : A ∈ P(n)}. We sh...

AIM The short wavelength sensitive (S) cone electroretinograms (ERGs) were examined in two patients with Oguchi's disease to study S cone function. METHODS Ganzfeld colour flashes under bright white background illumination were used to elicit S cone, and mixed long (L) and middle (M) wavelength sensitive cone ERGs. RESULTS The S cone ERG b-wave was normal with short wavelength stimuli with ...

The effects of pharmacological blockade of the proximal retinal activity by N-methyl-D-aspartate (NMDA) on the V-log I function of the ERG b- and d-waves were studied in dark and light adapted frog eyes. The effects of NMDA depended on the type of photoreceptor input. In rod-dominated ERG the b-wave amplitude was decreased by NMDA, but that of the d-wave remained unchanged. In cone-dominated ER...

The human cone electroretinogram (ERG) to flash trains and double flashes at different interflash intervals was studied. A double ganzfeld stimulator was used in which computer controlled flashes were presented independently in the presence of strong rod saturating backgrounds. Corneal ERGs were examined at different frequencies of flash train presentations. Flash trains with individual flashes...

Microtubule-associated protein 1 b (MAP1 b) is expressed at especially high levels in neurons actively extending axons, and although it appears to be required for axon growth, the nature of its role is unknown. We reasoned that a detailed description of the localization of MAP1 b in growing axons would help define how MAP1 b participates in axon growth. Therefore, we have stained cultured sympa...