1. Method for contactless measurement of a hollow spherical object or hollow cylindrical object, said hollow spherical object or hollow cylindrical object being translucent or transparent to visible light, said method being characterised in that: performing, with visible light, an observation directly on the object to acquire an image thereof, the image comprising a light ring and based on single-view optical shadowgraphy; determining the radius of the object from the image of the object; by way of the Snell-Descartes laws relating to the propagation of visible light through the object, establishing an equation that associates optical parameters and geometric parameters of the object with the result of the observation, the equation containing the radius of the light ring; determining at least one geometric or optical parameter of the object using the equation, the radius of the light ring and the result of the observation, and displaying the geometric or optical parameter.