1. Method for contactless measurement of a three-dimensional object, said three-dimensional object being translucent or transparent to visible light, said method being characterised in that: by way of the Snell-Descartes laws relating to the propagation of visible light through the object, an equation is established that associates the optogeometric parameters of the object with the result of an observation performed directly on an image of the object, said image being acquired by observing said object with the visible light, by single-view optical shadowgraphy, this image of the object is acquired, the observation is performed, and at least one geometric or optical parameter of the object is determined using the equation, the radius of the light ring and the result of the observation.