Results 141 to 150 of about 2,391 (172)

The s-Wave of the Multifocal Electroretinogram in Cats

Japanese Journal of Ophthalmology, 2006
To characterize the s-wave of the multifocal electroretinogram (mfERG) in cats, and to determine the contribution of the inner retina to the s-wave by examining the effects of tetrodotoxin (TTX) and N-methyl D: -aspartate (NMDA) injected into the vitreous cavity.mfERGs were recorded from 15 eyes of 15 male cats under general anesthesia.
Hiroyuki, Miyamoto, Yutaka, Tazawa, Akira, Hayasaka, Junfuku, Nitta, Isao, Egawa, Daijiro, Kurosaka   +5 more
openaire   +2 more sources

The effects of pupil size on the multifocal electroretinogram

Documenta Ophthalmologica, 2004
This is an investigation of the effect of changing the pupil diameter on the P1 amplitude and latency of the multifocal electroretinogram (mfERG). MfERGs were recorded using a custom built wide field electrophysiological system. An array of 61 empirically scaled hexagons was used to stimulate the visual field.
P, Gonzalez, S, Parks, F, Dolan, D, Keating   +3 more
openaire   +2 more sources

The multifocal electroretinogram in age-related maculopathies

Documenta Ophthalmologica, 2000
To measure and compare the multifocal electroretinogram in control group and patients with age-related maculopathies, 17 eyes of control subjects, 9 eyes of wet-form ARMD, 8 eyes of dry-form ARMD and 14 eyes of idiopathic macular hole were tested with VERIS Sciences 4.0.
S, Huang, D, Wu, F, Jiang, J, Ma, L, Wu, J, Liang, G, Luo   +6 more
openaire   +2 more sources

Aging-related changes in the multifocal electroretinogram

Journal of the Optical Society of America A, 2002
The multifocal electroretinogram (MERG) was recorded in the central 36 degrees-diameter field in 26 young (19-30 yr) and 20 old (60-74 yr) adults in normal retinal health according to a fundus grading scale. The mean amplitude densities of the first-order and second-order responses in this retinal region were lower for old adults compared with young ...
Gregory R, Jackson, JulioDeLeon, Ortega, Christopher, Girkin, Carol E, Rosenstiel, Cynthia, Owsley   +4 more
openaire   +2 more sources

Multifocal Visual Evoked Potentials and Multifocal Electroretinograms in Papillorenal Syndrome

Archives of Ophthalmology, 2002
A17-YEAR-OLD patient who had received a renal transplant was evaluated for possible glaucoma. Visual acuity was 20/20 at distance with 6/6 AO/HRR color plates correctly identified in each eye. The Humphrey 24-2 visual fields displayed binasal field loss (Figure 1). There was no relative afferent pupillary defect.
Candice S, Chen, Jeffrey G, Odel, Julie S, Miller, Donald C, Hood   +3 more
openaire   +2 more sources

Foveal amplitudes of multifocal electroretinograms are larger following full-field electroretinograms

Documenta Ophthalmologica, 2018
The clinical standards for multifocal electroretinograms (mfERG) call for adaption to normal room lighting before the mfERG begins. They specify that any assessments where bright lights are used, should be done after the mfERG to prevent excess stimulation of retinal cells. However, full-field electroretinograms (FFERG) are performed prior to mfERGs in
Wendy Harrison, Kaila Osmotherly, Nathan Biancardi, Jamison Langston, Russell Gray, Taylor Kneip, Reese Loveless   +6 more
openaire   +2 more sources

Lateral spread of adaptation as measured with the multifocal electroretinogram

Visual Neuroscience, 2001
We examined whether lateral spread of adaptation can be observed in the electroretinogram in humans. Specifically, we tested whether the luminance level of a surrounding, nonmodulated annulus affects the multifocal electroretinogram (ERG) response of a modulated central area.
W, Seiple, T S, Vajaranant, D R, Pepperberg, J P, Szlyk   +3 more
openaire   +2 more sources

Effects of unsteady fixation on multifocal electroretinogram (mfERG)

Graefe's Archive for Clinical and Experimental Ophthalmology, 2006
To investigate the effect of unsteady fixation on the multifocal electroretinogram (mfERG) measurement in normal subjects.The mfERGs of 20 subjects with normal vision (mean age=23.5 years) were recorded with different levels of voluntary eye movements made to mimic unsteady fixation.
Patrick H W, Chu, Henry H L, Chan, Susan J, Leat   +2 more
openaire   +2 more sources

Imaging localized retinal dysfunction with the multifocal electroretinogram

Journal of the Optical Society of America A, 1996
Conventional electroretinographic techniques do not permit efficient mapping of retinal responsiveness for the detection of small dysfunctional areas. This study explores the application of a new technique that makes such mapping possible. It utilizes a multifocal electroretinogram technique based on binary m sequences that simultaneously tests a large
M A, Bearse, E E, Sutter
openaire   +2 more sources

[Investigation of multifocal electroretinogram in amblyopia].

[Zhonghua yan ke za zhi] Chinese journal of ophthalmology, 2007
To investigate the changes of the multifocal electroretinogram (mfERG) in amblyopic eyes. Methods The mfERG of 28 anisometropic amblyopic cases (28 eyes), 25 strabismic amblyopic cases (25 eyes), 14 isometropic amblyopic cases (28 eyes) and 54 normal control eyes were tested.The N1 wave and P1 wave amplitude densities of mfERG first order kernel and ...
Hong, Ju, Kan-xing, Zhao, Nan, Zhou, Wei, Zhang   +3 more
openaire   +1 more source