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  • 1
    Electronic Resource
    Electronic Resource
    Measuring oscillatory potential during the course of an arterial occlusion: a method based on Fourier analysis (1988)
    Springer
    Documenta ophthalmologica 70 (1988), S. 199-203 
    Details
    ISSN: 1573-2622
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Recently we developed a quantitative method of measuring the Oscillatory Potentials (OP's) for a clinical study in diabetic patients. Several problems were experienced in interpreting the results obtained with digital filtering. The main dilemma was the separation of the first OP from the a-wave, since their frequencies are within the same range. The fast Fourier transform (FFT) was applied for this purpose. From the FFT response the power of the OP's was calculated and expressed in microwatts. The advantage of this method is clearly demonstrated in the case of a patient with central retinal arterial occlusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154454
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The standing potential of the eye in retinal detachments (1981)
    Springer
    Documenta ophthalmologica 50 (1981), S. 337-342 
    Details
    ISSN: 1573-2622
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To investigate the standing potential and its light rise in retinal detachments, a group of 33 patients was examined preoperatively. The group was divided into 3 subgroups according to the extent of the detachment. Apart from practical interest, this investigation was carried out to answer the question whether contact between the pigment epithelium and the receptor layer is necessary for the generation of the standing potential. This appeared not to be the case, on the contrary the standing potential was often higher. The EOG light rise, on the other hand, was more disturbed in comparison with the extent of the detachment. Various features of the EOG may be explained, if we assume an inhibitory action of the retina on the generator of the standing potential under normal conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00158018
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Measuring oscillatory potentials: Fourier analysis (1988)
    Springer
    Documenta ophthalmologica 69 (1988), S. 153-159 
    Details
    ISSN: 1573-2622
    Keywords: diabetic retinopathy ; electroretinogram ; Fourier analysis ; oscillatory potentials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Studying the oscillatory potentials in diabetic retinopathy, the authors experienced several problems interpreting results of digital filtering. The main problem was the separation of the first potential from the a-wave, since their frequencies are within the same range. To improve the procedure of measuring implicit times and of calculating amplitudes, the filtering was started with a finite impulse response filter and followed by a fast Fourier transform. The power of the oscillatory potential was calculated by determining the dominant frequency in the Fourier transformed response and expressed in microwatts. A group of normal subjects was compared with a group of early diabetic retinopathy patients. It appears that even in pathological circumstances a quantitative expression of the oscillatory potential is possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00153696
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    ERG and VECPs in retinal detachments (1981)
    Springer
    Documenta ophthalmologica 50 (1981), S. 291-297 
    Details
    ISSN: 1573-2622
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In retinal detachments the scotopic ERG is generally more disturbed than the photopic ERG; both are more disturbed than would be expected from the visibly detached retina. The disturbance is characterized by a reduction of both the a-wave and the b-wave. Furthermore, the photopic responses are clearly delayed when the detachment extends over more than half of the retina, giving a typical, even pathognomonic, wave form when the detachment covers more than three quarters of the retina. Even in total detachments, such a response, though very small, can usually be obtained, as well as a VECP after strong light flashes. Most likely they are responses of the detached retina.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00158012
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Treatment of amblyopia in strongly anisometropic eyes (1985)
    Springer
    Documenta ophthalmologica 59 (1985), S. 99-104 
    Details
    ISSN: 1573-2622
    Keywords: unilateral high myopia ; anisometropia ; aniseikonia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Following a hypothesis concerning the image-size on the retina the problem is discussed as to which of the various correction methods is to be preferred in the case of severe anisometropia. We treated nine anisometropic patients for amblyopia using contact lens correction. After amblyopia treatment we measured the aniseikonia in all the subjects by means of Phase Difference Haploscope. The aniseikonia appears to be less serious than might have been expected. Perhaps a more physiological situation can be created by means of early contact lens correction and as little aniseikonia as possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00162017
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Oscillatory potentials in early diabetic retinopathy (1989)
    Springer
    Documenta ophthalmologica 71 (1989), S. 375-379 
    Details
    ISSN: 1573-2622
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To study the oscillatory potentials in early diabetic retinopathy the authors developed a new power measurement based on the fast Fourier transform. Three groups totalling 46 patients were examined, varying from nonvisible to preproliferative diabetic retinopathy. The oscillatory potentials expressed in microwatts were measured under scotopic and photopic conditions. The data of the three groups are compared with those of a group of 22 normal individuals. The oscillatory potential power measurement appears to be a reliable method in detecting diabetic retinopathy at an early stage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152764
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    Paper (German National Licenses)
    Fulltext
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