New PDF release: Symposium on Light-Coagulation: Argon Laser and Xenon Arc

By Prof. Dr. Jules François (auth.)

ISBN-10: 906193141X

ISBN-13: 9789061931416

ISBN-10: 9401026955

ISBN-13: 9789401026956

The goal of this symposium on light-coagulation isn't to teach the superi­ ority of the argon-laser-coagulation or, to the contrary, of the classical picture­ coagulation, yet really to determine, if attainable, that are the respective symptoms and contraindications for xenon-are-coagulation in addition to for argon-laser­ coagulation. So, for example, the argon-Iaser-coagulator could be extra acceptable to regard the lesions at and round the macula and the optic disc, yet for the peripheral lesions of the retina the xenon-arc photocoagulator is unquestionably as powerful. For the conservative remedy of intraocular tumours, the xenon­ arc-coagula tor is past doubt extra efficacious than the argon-Iaser-coagu­ lator. We have been more than happy to have at this symposium Professor MEYER-SCHWICKE­ RATH, the writer and the pioneer of light-coagulation, his coworker, Professor WESSING, and healthcare professional HUNTER LITTLE, one of many pioneers of the laser-therapy. We thank them very warmly for having dropped at us the result of their promi­ nent medical experiments. After normal issues on laser-photocoagulation, we are going to have a dialogue on macular changes and their remedy in addition to on peripheral retinal vascular or non vascular ailments. crucial half matters the therapy of diabetic retinopathy. ultimately the prevention of problems in argon laser retinal photocoagulation should be reviewed.

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Extra resources for Symposium on Light-Coagulation: Argon Laser and Xenon Arc

Example text

The absorption properties of retinal pigment epithelium for the argon laser wavelength make argon laser photocoagulation an excellent means to treat retinal tears, retinal degeneration, and retinoschisis. The indications for treatment of these disorders remain complex. Since GONIN first recognized that retinal detachments were caused by retinal tears (1920), the indications for prophylactic treatment of retinal tears has been questioned. MEYER-SCHWICKERATH introduced retinal photocoagulation in the form of xenon arc light making treatment more feasible than with the previously used electrocautery (1960).

Patients beyond the fifth decade developed severe loss of central vision after 2 to 3 years. Besides detachment of the pigment epithelium a few cases show circumscribed leakage spots. This however, holds true only in the very early stage of the disease. Other cases develop subretinal vascular proliferation from the choriocapillaris. In our experience the results of photocoagulation in senile maculopathy are not very convincing. The only exception are those cases with leakage spots or vascular proliferation.

6. The diameter of lesions produced in Rhesus monkey increases with increase of power settings without changing spot size or exposure time settings. All lesions produced with 50 micron diameter setting. will be larger than one produced with a lower power. A 50 micron spot with 200 miIIiwatts of power at o. I of a second will be larger than a 50 micron spot produced at 50 milliwatts of power at o. I of a second (Fig. 6). Also for similar spot size and power settings, a lesion produced with a longer time exposure will be larger than a lesion produced with a minimal time setting.

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Symposium on Light-Coagulation: Argon Laser and Xenon Arc by Prof. Dr. Jules François (auth.)


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