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Biomedical subjects

W Heider

Publications and source records attributed to W Heider.

31 records · Page 2Linked to original sources
PubMed1987

[A differential diagnostic test for optic neuritis].

A temporary lowering of body temperature by means of cold drinks, tried on a group of 18 patients with acute optic neuritis, led in 14 cases to a significant improvement in the 30 degree visual field, which the authors tested with the Octopus 201 automatic perimeter. In a group of 11 patients (17 eyes) who had previously had optic neuritis an improvement in the visual field was only seen in 8 eyes; in the other 9 eyes there was a deterioration. A slight deterioration in the 30 degree visual field after lowering body temperature was demonstrated in a group of 7 patients (12 eyes) with various diseases of the optic nerve as well as in 5 other healthy subjects. The temporary improvement in the patients with acute optic neuritis was probably caused by a reversible increase in the conductivity of the demyelinated nerve fibers as a result of lowering body temperature.

Body Temperature Regulation↗
PubMed1986

[Defective artificial lenses].

The authors found the following defects in sterile-packed intraocular lenses, ready for implantation: the positioning holes had sharp edges; the lens surfaces were scratched from polishing and drilling; the lens loops were distinctly deformed. Following a description of these defects the possible clinical complications are discussed.

Humans↗
PubMed1985

ERG and VECP in chronic progressive external ophthalmoplegia (CPEO).

Eleven patients suffering from chronic progressive external ophthalmoplegia (CPEO) were investigated by means of electroretinograms (ERG) and visually evoked cortical potentials (VECP) to flash and checkerboard-reversal stimuli. One patient exhibited a Kearns syndrome, in two patients fundoscopy revealed pigmentary retinopathy, and the other eight patients had normal fundi. In the three patients with pigmentary retinopathy the ERGs were slightly disturbed or normal, the P100-latencies in the VECPs being normal. Three out of eight patients without pigmentary changes had reduced ERGs indicating unsuspected retinopathy. This nonpigmentary retinopathy was only detected by means of ERG and may be the electrophysiological correlate of a reduced visual acuity. One patient had a considerably prolonged P100-latency in the pattern-reversal VECP of one eye, which may indicate lesions of the visual pathway along with CPEO.

Adult↗
PubMed1985

[The pattern and light electroretinogram in occlusions of the retinal vessel branches].

Electroretinograms to brightness stimuli (H-ERG) and pattern reversal (M-ERG) were recorded in patients with branch occlusion of the retinal artery (8 cases) and retinal veins (6 cases). While the H-ERG exhibited essentially normal curves, the M-ERG was regularly disturbed. With central fixation the amplitude of response was markedly decreased. With eccentric fixation (14 degrees) exposing most of the diseased part of the retina the M-ERG was nonexistant.

Adult↗
PubMed1984

[Pattern and light electroretinograms in branch occlusions of the central retinal artery].

Electroretinographical responses to brightness (H-ERG, Ganzfeld illumination) and pattern reversal (M-ERG, illuminating an area of 20 degrees) were recorded in two cases of occlusion of the temporal inferior branch of the retinal artery. While the H-ERG exhibited essentially normal responses, the M-ERG was markedly disturbed. With central fixation the amplitude of response to pattern was decreased by more than 50 percent. With peripheral fixation (14 degrees) exposing most of the diseased part of the retina, the M-ERG was extinguished, whereas in the fellow eye pattern responses were present. The findings strongly support the notion that the M-ERG at least partly reflects the activity of retinal ganglion cells.

Arterial Occlusive Diseases↗
PubMed1984

[ERG and VECP in chronic progressive external ophthalmoplegia].

Eleven patients suffering from chronic progressive external ophthalmoplegia (CPEO) were examined by means of electroretinography (ERG) and the visually evoked cortical potential (VECP) with flash and checkerboard-reversal stimuli. One patient exhibited a Kearns-Sayre syndrome, and in two patients fundoscopy revealed pigmentary retinopathy; the fundi of the other 8 patients were normal. In 3 of the patients with pigmentary retinopathy the ERG was slightly disturbed or normal, the P100 latency in the VECP being normal. In three out of 8 patients without retinal pigmentary changes the ERG indicated retinopathy. In 2 cases this was the only finding offering an explanation for the reduced visual acuity. One patient exhibited a considerably prolonged P100 latency in the pattern-reversal VECP of one eye, which might have been indicative of lesions of the visual pathway associated with CPEO.

Adult↗
PubMed1984

[Binocular functions in unilateral pseudophakia].

71 patients (average age 64 years) were examined for binocular vision after unilateral posterior chamber lens implantation. Average visual acuity in the pseudophacic as well as the phacic eyes was 0.8. Intact stereoscopic dose-up and long-distance vision was found in 85% of the cases. Patients with vertical phorias or moderately decreased visual acuity more often presented impaired binocular functions. Further investigations will be carried out.

Aged↗
PubMed1984

[Aniseikonia in unilateral pseudophakia].

The authors report on a study of 20 patients (average age 56 years) with postoperative visual acuity of more than 0.8 in each eye. The patients had all undergone surgery for unilateral cataract with implantation of a posterior chamber lens. The aniseikonia was measured subjectively, and determined objectively by mathematical means. The quality of stereopsis was not influenced by the degree of aniseikonia (the maximum was 12.2%). The power of intraocular lenses for unilateral cataract should be chosen to produce not only slight aniseikonia but also minimal anisometropia.

Adult↗