Transient pattern electroretinograms (PERGs) and visual evoked potentials (VEPs) were recorded with checkerboard pattern reversal and equiluminance stimulus onset-offset, elicited by a high quality moving mirror stimulator. Different sized checkerboard patterns (0.35-4.2 c/deg) were used as stimulus patterns. The wave forms of the equiluminance stimulus onset responses were similar to ERGs evok...

Objective: This work aims to evaluate whether glaucomatous visual ®eld defects could be related to an impaired retinal function, to a delayed neural conduction in postretinal visual pathways, or both. Methods: Visual ®eld by Humphrey perimeter (central 24-2 threshold test) and simultaneous recordings of visual evoked potential (VEP) and pattern electroretinogram (PERG) were assessed in 21 subje...

Aim: To characterise and monitor abnormal fundus autofluorescence (AF) in patients with retinitis pigmentosa (RP) who have good visual acuity. Methods: 21 patients with a clinical diagnosis of RP were examined. All had rod-cone dystrophy (ISCEV standard electroretinograms (ERGs)), visual acuity of 6/9 or better, and manifested a parafoveal ring of high density fundus AF. Repeat AF imaging was p...

PURPOSE Optimal screening for ocular toxicity caused by chloroquine and hydroxychloroquine is still controversial. With the multifocal pattern electroretinogram (mfPERG), a new electrophysiological technique has recently become available to detect early changes of ganglion cells. In this study this new technique is applied to a series of 10 patients seen consecutively receiving long-term chloro...

Focal electroretinograms (FERG), pattern electroretinograms (PERG), and visual evoked potentials (VEP) were studied in a group of 30 aphakic patients with cystoid macular oedema (ACME). When compared with a control group of age-matched aphakics, 35% of patients were found to have abnormal FERG responses and 53%--over half of whom had normal FERG responses--showed abnormal PERG amplitudes. Altho...

P/E ratios are one of the tools most widely-used by analysts and the key variable in many value strategies. PEG ratios, an increasingly-popular valuation tool among analysts, improve upon P/E ratios by adjusting the latter by growth. This article proposes a new tool, the PERG ratio, that adjusts P/E ratios by both growth and risk, or, similarly, PEG ratios by risk. The evidence reported shows t...

PURPOSE To assess whether a correlation exists between optic nerve fiber layer (NFL) thickness and the retinal or visual pathway function in multiple sclerosis (MS) patients previously affected by optic neuritis. METHODS Fourteen patients with a diagnosis of definite MS were examined. All had been affected by optic neuritis (MSON) with complete recovery of visual acuity (14 eyes included in s...

The retinal response to particular orientations might start a signaling cascade of events that help modulate eye growth and respond myopia control treatments. purpose this study was investigate the electrical activity in grids different spatial orientations. multifocal (mfERG) pattern (PERG) ERG responses nine eyes (spherical equivalent −0.45 ± 1.15 D; mean age 32.9 7.7 years) were recorded wit...

Hereditary retinal dystrophies are most often disorders of photoreceptors and/or the retinal pigment epithelium. Structures secondary to the photoreceptor layer such as bipolar, horizontal, amacrine and ganglion cells are secondarily involved. In later stages of the disease a mild to moderate loss of inner retina occurs, but the second and third neurons remain surprisingly viable even in late a...