Pattern electroretinogram (PERG) results recorded in different laboratories from patients with unilateral traumatic transections of the optic nerve have led investigators to opposite conclusions about the sources of this response. There was no absolute demonstration of complete transection in any of these studies. In the present study, PERGs and flash ERGs were recorded from a patient who, 30 m...

AIM To investigate the effect of pseudophakia on visual electrophysiology. METHODS Right eyes of 60 pseudophakic (study group) age- and sex-matched 60 phakic (control group) volunteers were included. Subjects without any ocular and systemic disease, who had visual acuity of more than 9/10 underwent full-field electroretinogram (ERG), pattern electroretinogram (PERG), pattern visual evoked pot...

Retinal dopamine depletion in monkeys using either systemic MPTP or 6-OHDA results in attenuated electroretinographic (ERG) responses to peak spatial frequency stimuli. Diverse dopamine receptors have been identified in the primate retina. ERG studies performed using Haloperidol (a mixed antagonist), L-Sulpiride (D2 antagonist) and CY 208-243 (a D1 agonist) cause spatial frequency dependent div...

PURPOSE To document the existence of idiopathic bilateral optic atrophy (BOA) in rhesus macaque monkeys and to characterize the structural and functional consequences of this condition. METHODS In vivo assessment of retinal and optic nerve structure included fundus biomicroscopy and stereophotography. Functional analyses included transient pattern-reversal electroretinography (PERG) and full-...

Explosive blasts associated with even mild traumatic brain injury can lead to substantial but delayed visual deficits, even in the absence of overt clinical presentation. There are two major challenges for these patients: lack of sensitivity in diagnostic testing to reveal the visual deficit and a dearth of viable treatment options to restore lost vision. In this issue of IOVS, Dutca et al. ind...

PURPOSE Effects of haloperidol on K(+) currents (IKs) of rat retinal ganglion cells (RGCs) were examined, with the hypothesis that its alteration of IKs explains alterations in the pattern electroretinogram (PERG). METHODS Fast blue was injected into superior colliculi of rats (3-8 days old) to identify RGCs under epifluorescence illumination after retrograde transport to retinas. Retinas wer...

در این پژوهش تقویت باریکه لیزر تپی فمتوثانیه Ti:sapphire ­کننده بازتولیدی با آرایش هندسی Z براساس روش تپ چیرپ بررسی شده است. برای انتقال ورودی اولیه به داخل کاواک و استخراج از دو سلول پاکل استفاده زمان شکل‌گیری برحسب انرژی دمش مطالعه روند تحول مورد قرار گرفته مدت تولید بدون حضور 80 نانوثانیه فرایند 38 نرخ تکرار 10 هرتز طول موج مرکزی 800 نانومتر بیشینه 2 میلی‌ژول بعد 17 رفت برگشت 15 میلی ژول 532...

The contrast transfer function (CTF) of the pattern electroretinogram (PERG) depends on temporal frequency. For transient stimulation it is fully linear; at faster stimulation rates it becomes strongly non-linear with an accelerated shape. In this study we investigated a range of stimulus parameters with the aim of studying the influence of temporal and spatial frequencies, as well as contrast ...