Abstract
The authors tried to quantify, through photoelastopodometry, the distribution of pressures within the forefoot of individuals with their foot stationary. The technique used for the purpose is derived from photoelastopodoscopy; its principle consists in arranging for a beam of polarised light to travel through a birefringent material and then to be reflected, so that it travels back through the birefringent material and the polariser. The polarised rays are delayed with respect to each other by the deformations during their passage through the birefringent material. This optical phenomenon is visualised on a mirror in the form of isochromatic fringes, and is recorded on photographic plates.
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