Measuring oscillatory potentials: Fourier analysis

K van der Torren, G Groeneweg, G van Lith

    Research output: Contribution to journalArticleResearchpeer-review


    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.

    Original languageEnglish
    Pages (from-to)153-9
    Number of pages7
    JournalDocumenta ophthalmologica. Advances in ophthalmology
    Issue number2
    Publication statusPublished - Jun 1988


    • Adult
    • Aged
    • Diabetic Retinopathy/physiopathology
    • Electroretinography/methods
    • Fourier Analysis
    • Humans
    • Middle Aged
    • Photic Stimulation/methods
    • Reference Values


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