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Documenta Ophthalmologica. Advances in Ophthalmology

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https://www.readbyqxmd.com/read/27882486/vep-analysis-methods-in-children-with-optic-nerve-hypoplasia-relationship-to-visual-acuity-and-optic-disc-diameter
#1
John P Kelly, James O Phillips, Avery H Weiss
PURPOSE: Assessing vision in young children with optic nerve hypoplasia (ONH) is challenging due to multi-directional infantile nystagmus, the range of optic nerve loss, and cognitive delay. This study examined visual evoked potential (VEP) responses and averaging techniques in children with ONH. The assumption is that EEG epochs with inconsistent temporal phase would be associated with nystagmus, signal reduction due to axon loss, and visual inattention. METHODS: A retrospective chart review was performed on 44 children (average age 2...
November 23, 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27864655/imitating-the-effect-of-amblyopia-on-vep-based-acuity-estimates
#2
Sven P Heinrich, Celia M Bock, Michael Bach
PURPOSE: Acuity testing based on visual evoked potentials (VEPs) overestimates acuity in patients with amblyopia. We hypothesized that distortion and fragmentation of the stimulus in amblyopia impede recognition of optotypes, while it leaves the pattern onset response in the VEP mostly unaffected, resulting in overestimation of acuity. METHODS: Acuity VEPs were recorded in visually normal participants with the stimulus degraded by patterned polymethyl methacrylate panes, which induce distortion and fragmentation...
November 18, 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27838859/macular-function-in-preterm-children-at-school-age
#3
Hanna Åkerblom, Sten Andreasson, Gerd Holmström
PURPOSE: Macular development is a complex process that starts by mid-gestation and continues several years after birth. A preterm birth could affect this development, causing increased thickness in the central macula, but the effect of the macular function remains uncertain. The aim of this study was to investigate the macular function measured with multifocal electroretinography (mfERG), in former preterm children and compare with healthy controls. A second aim was to correlate central macular function with central macular thickness measured with optical coherent tomography (OCT), in the preterm group...
November 12, 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27832406/electrophysiological-testing-of-visual-function-after-mirror-telescope-implantation-a-case-report
#4
Jan Kremláček, Naďa Jirásková, Jana Nekolová, Radovan Šikl, Miroslav Kuba
PURPOSE: The implantation of an intraocular telescope increases life quality in patients with end-stage age-related macular degeneration (AMD). The present study monitored changes in electrophysiological markers of visual processing before and during seventeen months after a novel mirror telescope implantation in two patients (OV-male 90 years, MZ-female 70 years) with the final-stage form of AMD. METHODS: Visual evoked potentials were recorded to high-contrast pattern-reversal (PR-VEP for check size 40' and 10'), low-contrast motion-onset stimuli (in visual periphery M-VEP M20°, and in central part M-VEP C8°), and event-related potentials (ERPs) in the oddball visual paradigm...
November 10, 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27665467/variability-of-the-multifocal-electroretinogram-based-on-the-type-and-position-of-the-electrode
#5
Ángel García-García, Francisco José Muñoz-Negrete, Gema Rebolleda
PURPOSE: To evaluate and compare the wave amplitude of multifocal electroretinogram (mfERG) measurements and discomfort from Dawson-Trick-Litzkow (DTL) electrode located on the cornea (cDTL) and on the conjunctival fornix (fDTL) and ERG-jet contact lens electrode (CL). METHODS: Thirty-six patients and 18 healthy volunteers were evaluated with three different methods (cDTL, fDTL and CL). Wave amplitude, number of artifacts, number of electrode dislocations and level of discomfort obtained with each electrode were compared...
October 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27655147/a-late-foveal-response-component-of-multifocal-electroretinograms-in-healthy-subjects
#6
Gamal Tamam Ahmed Kariman, Yoshiaki Shimada, Masayuki Horiguchi
PURPOSE: To investigate the characteristics of the late foveal response component (lfrc) that presents on the first slice of the second-order kernel (K2.1) in multifocal electroretinograms (mfERGs). METHODS: mfERGs with 37 hexagonal stimulus elements were obtained from 27 healthy subjects under a stimulus intensity of 2.67 cds/m(2), base rate of 75 Hz, and a net recording time of 1 min 49.2 s, using bipolar contact lens electrodes. The responses on the centermost hexagon (with a diameter of 4...
October 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27655146/towards-an-electroretinographic-assay-for-studying-colour-vision-in-human-observers
#7
Jan Kremers, Deepak Bhatt
PURPOSE: To determine whether electroretinograms (ERGs) to heterochromatic stimulation can detect and quantify hereditary colour vision deficiency. METHODS: ERGs were measured to counterphase modulation of red and green stimuli. The total modulation depth of the red and green stimuli was constant. The ratio of red to green modulation was varied, and the responses were measured at two temporal frequencies: 12 and 36 Hz. Subjects were 13 protanopes, 19 protanomalous trichromats, 38 deuteranopes, 16 deuteranomalous trichromats and 22 normal trichromats...
October 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27562839/comparison-of-photopic-negative-response-measurements-in-the-time-and-time-frequency-domains
#8
Hansa Kundra, Jason C Park, J Jason McAnany
PURPOSE: To compare measurements of the full-field photopic negative response (PhNR), as well as intra-subject variation in the PhNR, using time and time-frequency domain analyses. METHODS: Full-field ERGs were recorded from 20 normally sighted subjects (aged 24-65 years) elicited by a long-wavelength pulse (3 cd s m(-2)) presented against a short-wavelength adapting field (12.5 cd m(-2)). Three to 10 waveforms were obtained from each subject, and each waveform was analyzed using standard time domain analyses of the PhNR, as well as a discrete wavelet transform (DWT) to extract time-frequency components that correspond to the PhNR...
October 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27553815/successful-scleral-buckling-of-late-onset-visual-decrease-in-eye-with-retinal-folds
#9
Yuri Nakayama, Satoshi Katagiri, Tadashi Yokoi, Makiko Ui, Sachiko Nishina, Noriyuki Azuma
PURPOSE: To describe the outcome of scleral buckling to treat radial retinal folds (RFs) that caused a late-onset and sudden visual decrease with impairment of the fovea. METHODS: This is an observational case report. Ophthalmic examinations were performed preoperatively and postoperatively and included measurement of the best-corrected visual acuity (BCVA), fundus examination, fluorescein angiography, focal macular electroretinography (FM-ERG), and spectral-domain optical coherence tomography (OCT)...
October 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27510912/transfer-characteristics-of-subretinal-visual-implants-corneally-recorded-implant-responses
#10
K Stingl, K U Bartz-Schmidt, A Braun, F Gekeler, U Greppmaier, A Schatz, A Stett, T Strasser, V Kitiratschky, E Zrenner
PURPOSE: The subretinal Alpha IMS visual implant is a CE-approved medical device for restoration of visual functions in blind patients with end-stage outer retina degeneration. We present a method to test the function of the implant objectively in vivo using standard electroretinographic equipment and to assess the devices' parameter range for an optimal perception. METHODS: Subretinal implant Alpha IMS (Retina Implant AG, Reutlingen, Germany) consists of 1500 photodiode-amplifier-electrode units and is implanted surgically into the subretinal space in blind retinitis pigmentosa patients...
October 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27488106/54th-iscev-symposium
#11
(no author information available yet)
No abstract text is available yet for this article.
August 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27443562/iscev-standard-for-clinical-visual-evoked-potentials-2016-update
#12
J Vernon Odom, Michael Bach, Mitchell Brigell, Graham E Holder, Daphne L McCulloch, Atsushi Mizota, Alma Patrizia Tormene
Visual evoked potentials (VEPs) can provide important diagnostic information regarding the functional integrity of the visual system. This document updates the ISCEV standard for clinical VEP testing and supersedes the 2009 standard. The main changes in this revision are the acknowledgment that pattern stimuli can be produced using a variety of technologies with an emphasis on the need for manufacturers to ensure that there is no luminance change during pattern reversal or pattern onset/offset. The document is also edited to bring the VEP standard into closer harmony with other ISCEV standards...
August 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27431284/54th-iscev-symposium-singapore-august-13-2016-august-18-2016
#13
(no author information available yet)
No abstract text is available yet for this article.
August 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27431283/iscev-symposium-programme-listing-chronological-order
#14
(no author information available yet)
No abstract text is available yet for this article.
August 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27431282/iscev-symposium-author-index
#15
(no author information available yet)
No abstract text is available yet for this article.
August 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27394667/effect-of-shorter-dark-adaptation-on-iscev-standard-da-0-01-and-da-3-skin-ergs-in-healthy-adults
#16
R Hamilton, K Graham
PURPOSE: To quantify dark-adapted (DA) skin ERG changes during 20 min of dark adaptation. METHODS: Sixteen healthy adult subjects were dark-adapted for 20 min during which ISCEV standard dim (0.01 phot cd s m(-2)) white flash ERGs were recorded at 1, 2, 3, 4, 5, 10, 15 and 20 min, and bright (3 phot cd s m(-2)) white ERGs were recorded at 2, 5, 10, 15 and 20 min without mydriasis and using skin electrodes. Amplitudes and peak times were normalised to 20 min values...
August 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27378278/the-effect-of-cilostazol-on-electrophysiologic-changes-in-non-proliferative-diabetic-retinopathy-patients
#17
Hoon Dong Kim, Si Hyoung Lee, Yoon Kyoung Kim, Jong Rok Oh, Young-Hoon Ohn
PURPOSE: To evaluate the effects of cilostazol, an antiplatelet and vasodilation agent, on the retinal function of patients with non-proliferative diabetic retinopathy (NPDR) using a full-field electroretinogram (ffERG). METHODS: A total of 20 eyes from 20 patients were enrolled as the cilostazol-treated group, and 16 eyes from 16 patients were enrolled as the control group to assess the functional effects of cilostazol. Ophthalmologic examinations including fundus fluorescein angiography (FFA), fundus color photography, optical coherence tomography (OCT), and ffERG responses were recorded at baseline and after 1 year of cilostazol treatment...
August 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27369766/abnormal-8-hz-flicker-electroretinograms-in-carriers-of-x-linked-retinoschisis
#18
J Jason McAnany, Jason C Park, Frederick T Collison, Gerald A Fishman, Edwin M Stone
PURPOSE: To evaluate rod-isolated, cone-isolated, and combined rod and cone flicker electroretinograms (ERGs) as a possible means to identify electrophysiological abnormalities in carriers of X-linked retinoschisis (XLRS). METHODS: Full-field ERGs were recorded from six carriers of XLRS (aged 34-66 years) and eight normally sighted subjects (aged 27-59 years) under rod-isolated (ERGR), cone-isolated (ERGC), and combined rod and cone (ERGR+C) conditions. ERGs were obtained using a four-primary LED-based ganzfeld photostimulator and standard recording techniques...
August 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27312134/exploring-the-methods-of-data-analysis-in-multifocal-visual-evoked-potentials
#19
L Malmqvist, L De Santiago, C Fraser, A Klistorner, S Hamann
PURPOSE: The multifocal visual evoked potential (mfVEP) provides a topographical assessment of visual function, which has already shown potential for use in patients with glaucoma and multiple sclerosis. However, the variability in mfVEP measurements has limited its broader application. The purpose of this study was to compare several methods of data analysis to decrease mfVEP variability. METHODS: Twenty-three normal subjects underwent mfVEP testing. Monocular and interocular asymmetry data were analyzed...
August 2016: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/27290699/electrophysiological-and-clinical-tests-in-dry-age-related-macular-degeneration-follow-up-differences-between-mferg-and-oct
#20
Emilio González-García, Concepción Vilela, Amparo Navea, Emma Arnal, Maria Muriach, Francisco J Romero
BACKGROUND: Age-related macular degeneration (AMD) is one of the major causes of progressive and debilitating visual impairment in developed countries and has become a growing health and social issue that needs to be addressed. Imaging techniques and functional tests are useful to assess the degree of macular dysfunction and AMD progression. However, given the slow progression of the disease, it is necessary to identify which techniques are more sensitive for the diagnosis and monitoring of patients with AMD...
August 2016: Documenta Ophthalmologica. Advances in Ophthalmology
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