PURPOSE To characterize the topographic response of the healthy human retina to acute oxygenation changes in vivo, using multifocal electroretinography (mfERG). METHODS Ten eyes in 10 subjects were examined while they breathed 21% oxygen (normoxia), 10% oxygen (hypoxia, with 90% nitrogen), or 100% oxygen (hyperoxia). Capillary oxygenation was monitored by percutaneous infrared oximetry. RES...

PURPOSE To investigate how the multifocal electroretinogram (ERG) is altered in conditions of blocking, light scattering, or distortion of the stimulus that are seen in ocular pathologies. METHODS A central 40 degree-diameter stimulus pattern consisting of 61 hexagons was presented on a cathode ray tube monitor at a rate of 75 Hz according to the pseudo-random binary M sequence by the Veris c...

PURPOSE To identify local retinal abnormalities in diabetic patients with and without retinopathy, by using the multifocal electroretinogram (M-ERG). METHODS Electroretinograms were recorded at 103 discrete retinal locations in each eye of eight persons with nonproliferative diabetic retinopathy (NPDR) and eight diabetic persons without retinopathy, using VERIS (EDI, San Mateo, CA). The ampli...

PURPOSE The time-dependent effect of anesthetics on the retinal function is debated. We hypothesize that in anesthetized animals there is a time-dependent decline that requires optimized multifocal electroretinogram (mfERG) recording procedures. METHODS Conventional and four-frame global-flash mfERG recordings were obtained approximately 15, 60, and 150 minutes after the induction of propofol...

PURPOSE The aim of this study was to obtain a better understanding of the cellular contributions to the porcine global flash mfERG by using a pharmacologic dissection method, together with the method using variation of stimulus contrast which has been used to demonstrate mfERG changes in human glaucoma. METHODS Global flash mfERGs with different stimulus-contrast settings (99%, 65%, 49% or 29...

Перенести в английский вариант Purpose. To assess the effect of adequate laser coagulation (LC) peripheral vitreochorioretinal dystrophy (PVCRD) on clinical and functional state retina microcirculation macular region. Material methods. Ganzfeld electroretinogram (ERG), multifocal ERG (mfERG), optical coherent tomography with a function angiography (OCTA) were performed for 22 patients (37 eyes)...

purpose: to study recordings of oscillatory potentials (ops) of the electroretinogram (erg) in diabetic eyes that have no visible fundus alterations, to ascertain whether changes in sensitivity are evident when compared with recordings from age-matched controls. methods: ops of the erg were measured from 68 eyes of 34 patients with diabetes without retinopathy and from 30 eyes of 15 normal subj...