Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Outcome of Traumatic Optic Neuropathy. Comparison Between Surgical and Nonsurgical Treatment (1999)
    Springer
    Acta neurochirurgica 141 (1999), S. 27-30 
    Details
    ISSN: 0942-0940
    Keywords:  Keywords: Traumatic optic neuropathy; visual improvement; surgical treatment; nonsurgical treatment.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary  34 patients with indirect traumatic optic neuropathy were studied to identify factors affecting outcome and surgical indications. 12 cases (13 eyes = group A) underwent surgery and 24 patients (24 eyes = group B) were managed without surgery. Age, optic canal fracture, visual acuity before treatment (initial visual acuity) and days until surgery (only group A) were employed as variables. Visual acuity improved significantly more in patients with initial visual acuity, hand movement (HM) or better than in those with initial visual acuity for light perception (LP) only or worse. When initial visual acuity was HM or better, vision improved significantly more in patients with surgery than in those without surgery (p=0.0003) by Mann-Whitney U test). Days until surgery were correlated with visual improvement in patients with visual acuity HM or better. Age and optic canal fracture did not affect visual improvement or influence the decision for or against surgery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007010050262
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Monocular and binocular evoked average potential field topography: Upper and lower hemiretinal stimuli (1983)
    Springer
    Experimental brain research 50 (1983), S. 341-346 
    Details
    ISSN: 1432-1106
    Keywords: Visual evoked potentials ; Scalp field EP distribution ; Monocular vs binocular stimuli ; Upper vs lower hemiretina
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Scalp potentials evoked by monocular and binocular 2/s checkerboard reversals with checks of 56 or 14 min were recorded from four midline electrodes between inion and 7.5 cm above inion vs a common anterior reference in 31 normals. The electrode location and latency of the evoked maximal occipitally positive potential difference between any 2 of the 5 electrodes, between 80 and 140 ms latency was determined in each run. Mean maximum locations over subjects for upper hemiretinal, binocular stimuli were more anterior than for monocular stimuli; for lower hemiretinal stimuli, inverted location differences were found. Binocular responses also had shorter latencies than monocular responses. Since area 18 is more anterior to 17 for upper, more posterior to 17 for lower hemiretinal projection to cortex, the results suggest that neurons which respond only if both eyes are simultaneously stimulated are more frequent in higher than lower order visual areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00239198
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Effects of aging on the temporal frequency characteristics determined by pattern visually evoked cortical potentials (1988)
    Springer
    Documenta ophthalmologica 69 (1988), S. 139-144 
    Details
    ISSN: 1573-2622
    Keywords: aging ; pattern reversal visually evoked cortical potentials ; Pl amplitude ; temporal frequency ; temporal tuning curve
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Pattern reversal visually evoked cortical potentials were recorded from 70 normal volunteers, aged from 4 to 70 years. Eleven reversal frequencies between 1 and 20 rev/sec were presented. The progressive reduction in the amplitude of the P100 component with age for lower frequency ranges was shown up to the age decade of 30–39 years and the temporal tuning curve became a constant pattern after 40 years. However, there was a trend that the maxima of the tuning curve shifted toward lower frequencies with age after 30 years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00153694
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Electroretinograms and pattern visually evoked cortical potentials in central areolar choroidal dystrophy (1990)
    Springer
    Documenta ophthalmologica 75 (1990), S. 33-40 
    Details
    ISSN: 1573-2622
    Keywords: central areolar choroidal dystrophy ; electroretinogram ; pattern visually evoked cortical potentials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We describe three patients with central areolar choroidal dystrophy whose electroretinograms (ERGs) and pattern visually evoked cortical potentials (VECPs) confirmed their macular dysfunction. Visual fields measured by Goldmann perimetry showed central relative scotomata corresponding to a dystrophic lesion. Dark adaptation curves were slightly abnormal either in the first curve or in the second curve, depending on the visual acuity. Color vision was disturbed irregularly. Fluorescein angiography revealed a loss of the choriocapillaries, and a hyperfluorescent border outlined the dystrophic lesion. Single-flash dark-adapted ERGs and scotopic ERGs were almost normal, while photopic and flicker ERGs showed slightly attenuated amplitudes. Conversely, VECPs to pattern reversal stimulation were greatly affected for both transient and steady-state stimuli. We conclude that, in central areolar choroidal dystrophy, pattern VECPs can provide more information on macular dysfunction than does the ERG.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00142591
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Facially distributed pattern-evoked potentials in multiple sclerosis (1987)
    Springer
    Documenta ophthalmologica 65 (1987), S. 259-269 
    Details
    ISSN: 1573-2622
    Keywords: equipotential map ; multichannel recordings ; multiple sclerosis ; pattern ERG ; pattern VECP ; skin electrodes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Among 56 established cases of multiple sclerosis in our clinic from April 1978 to March 1985, optic neuritis was found in 38; 21 cases were bilateral. We studied pattern-evoked potentials detected with 16 electrodes placed on both the scalp and the facial area. Pattern-evoked potentials (PERGs) were obtainable at the facial area in multiple sclerosis patients with optic neuritis, except in long-standing cases. However, a significant reduction of amplitude was found even in cases without optic neuritis. No correlation was found between visual acuity and amplitude or peak latency of PERGs in MS patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00149933
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Comparison of automated perimetry and pattern visually evoked cortical potentials in optic neuritis (1988)
    Springer
    Documenta ophthalmologica 69 (1988), S. 263-269 
    Details
    ISSN: 1573-2622
    Keywords: Octopus perimetry ; optic neuritis ; pattern visually evoked cortical potential ; program Delta ; program Sargon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Twenty-one eyes of thirteen patients suffering from optic neuritis were examined with the Octopus automated perimeter and pattern visually evoked cortical potentials. All eyes had visual acuity of 0.2 or better. Visual field examination was measured by program 31 or 33, which tests the central 30-degree fields in a 6-degree grid. Pattern evoked potentials were obtained by reverse checkerboard stimulation of 3 rev/sec. A prolonged P100 latency was related to at least one abnormal point in the central nine points of program 31. All seven eyes with one abnormal point in the center had a delayed peak latency. The patients with either the normal central nine points of program 31 or normal peak latency had visual acuity of 0.6 or better. The graphs of visual acuity by Octopus compared with pattern evoked potential were very similar. With program Delta, the sensitivity loss ratio, i.e., the ratio of the mean loss at eccentricity of less than 10 degrees over less than 30 degrees, was related to the peak latency in optic neuritis caused by multiple sclerosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154407
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Pattern electroretinograms recorded with a skin electrode in pigmentary retinal degeneration (1985)
    Springer
    Documenta ophthalmologica 61 (1985), S. 33-39 
    Details
    ISSN: 1573-2622
    Keywords: flash electroretinograms ; pattern electroretinograms ; pattern visual evoked cortical potentials ; pigmentary retinal degeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In 24 patients suffering from pigmentary retinal degeneration the electro-retinograms to pattern stimulation (PERG) were recorded with a silver-cup electrode placed on the center of the lower eyelid skin referred to an electrode on the earlobe. The results were compared with the responses to flash stimulation (FERG) and pattern visual evoked cortical potentials. None of patients showed normal FERGs. Nineteen of 48 eyes showed subnormal FERGs. The PERG was recorded from those 19 eyes. In the remaining 29 eyes with flat FERG, 8 eyes showed clear PERGs. The peak latency of the first positive component of PERGs was found to be prolonged in these patients. PERGs seemed to be recordable in the patients whose visual acuity and central visual field were relatively well preserved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00143213
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Check size and defocusing effects on equipotential maps of pattern-evoked electroretinograms (1987)
    Springer
    Documenta ophthalmologica 65 (1987), S. 367-375 
    Details
    ISSN: 1573-2622
    Keywords: check size ; contrast ; defocusing ; equipotential map ; facial distribution ; pattern electroretinogram ; skin electrode
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The spatial distribution of the pattern-evoked potentials on the face was studied with a simultaneous 16-channel recording system. The potentials had the first positive component at a peak latency of approximately 55 msec, which was much earlier than the latency of the response picked up from the scalp. The maximal potential value in the maps was found at the region around the stimulated eye. This configuration of the equipotential map was not influenced by defocusing and check size of the pattern, but was altered by changing the contrast. Our results of equipotential maps constructed at around 55 msec after pattern reversal proved that the responses recorded in the facial region originated in the retina and were not a reflection of the scalp potentials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00149943
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Evaluation of pattern visual evoked cortical potentials for prescribing spectacles in mentally retarded infants and children (1987)
    Springer
    Documenta ophthalmologica 66 (1987), S. 253-259 
    Details
    ISSN: 1573-2622
    Keywords: mentally retarded infants and children ; pattern visual evoked cortical potential ; prescription of spectacles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We found that refractive errors were present in about 80% of 650 mentally retarded infants and children. The appropriate spectacles were prescribed for 75%. Evaluation of the effectiveness of wearing spectacles was based on the observation of their daily behavior and visually evoked cortical potentials to pattern stimuli (PVECP). Despite difficulties, we are able to record PVECPs in 160 subjects, of whom PVECPs were detectable in 140 (87.5%). The amplitudes of PVECPs with spectacles were larger than those without spectacles in 55.2% of the 105 subjects whose PVECPs were examined both with and without spectacles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145239
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Visuell evozierte corticale Potentiale (VECP) bei Siderosis retinae (1974)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 191 (1974), S. 299-306 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Durch Ableitung der visuell evozierten corticalen Potentiale (VECP) im EEG wurde die Funktion des Zapfen- und Stäbchenapparates im zentralen Netzhautbereich eines Patienten mit Siderosis retinae untersucht. Der Patient steht seit 4 Jahren unter klinischer und elektroretinographischer Kontrolle, und die Erkrankung zeigt eine Maculabeteiligung. Die Spektralsensitivität des Tagesapparates war für Blau (451 nm) am stärksten, für Rot (650 nm) mäßig und für Grün (550 nm) am geringsten herabgesetzt. Noch deutlicher gestört war die Aktivität des Dämmerungsapparates.
    Notes: Summary The cone and the rod system of a patient with siderosis retinae was investigated by recording the visual evoked cortical potentials (VECP) in the EEG. The patient had been under clinical observation including electroretinography (ERG) for 4 years and showed macular intrusion. Under photopic conditions the spectral sensitivity was more depressed in the blue (451 nm) than in the red (650 nm), and least in the green (550 nm). Even more pronounced was the disturbance of the rod system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00410095
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...