Television Fluorescein-Angiography of the Retina with On-Line Measurement of the Dilution Curves

Abstract

For a long time television techniques have been employed for the imaging of the human retina. Lidley (1950) reported as early as 1950 about the application of television systems in ophthalmology. During the last years the low light level technique has rendered possible examinations with a low light stress; and computers allow an objective evaluation of the data. Van Heuven et al. (1972), Yuhasz et al. (1973) and Wessing et al. (1974) have made recordings of retinal fluorescein angiograms with a good resolution and a tolerable light stress. Some procedures are able to measure blood flow parameters of the human retina on-line as well as off-line. The essential disadvantages of these methods — especially the on-line methods — are the very high light stress and the missing reproducibility in the evaluation of the data. This leads to the fact that none of these methods are used in clinical routine as yet. The image analyzer Mikro-Videomat 3 (Carl Zeiss AG) renders the measurement of objective data from the recorded television fluorescein angiograms possible (Jung et al., 1980; Körber and Gesch, 1982). The recording method is shown in Fig. 1.