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A new instrument for the measurement of choroidal blood flow in the fovea is presented. It is based on the laser Doppler method and a confocal optical system with an indirect detection of the Doppler shifted light. METHOD: The intensity of the laser beam (785 nm) at the cornea is 90 ?W. Measurements were obtained from a normal population of 21 subjects under resting conditions without dilating the pupil. RESULTS: The reproducibility of the choroidal blood flow, based on 5 measurements of 10 sec each in 5 randomly selected subjects, is 9%. The minimum detectable change for a statistical significance of p{243}0.05, based on a population of 21 subjects and 10 sec measurements, is 9%. CONCLUSION: This new compact instrument appears to be suitable for the investigation of the physiology and pharmacology of choroidal blood flow and the effect of age-related macular degeneration. (French)SA
M.H. Geiser, Institut de Recherche en Ophtalmologie, Av. Grand-Champsec 64, CH-1950 Sion; Switzerland
6.11 Bloodflow measurements (Part of: 6 Clinical examination methods)