In the third case, the accuracy and stability of the image are important, binoculars astronomies are often equipped with an adapter to mount on a support ( tripod ).

The light enters the optical system with multiple objectives lenses at the end of each tube . The objectives are converging systems, the resulting images are returned (up / down) as in a telescope. To allow observation of land recovered images (right), a vehicle light is interposed in the light path. Composed of a prism system, it offers the advantage of bending the beam and reduce the overall size of the instrument. Another advantage that characterizes the optical device, optical beams, bent, remain parallel, thereby increasing the gap of the optical axes of the objectives by keeping a distance between the axes of output equal to the eye of the beholder. The consequence is the preservation of sensation of relief, increased, again, by a higher magnification of the camera unit.

Bridging, destroy, relax the wrinkle to make it disappear, techniques abound.
* Absorbable products, to be renewed after one or two years on average, but allowing a “back”. For these products, the risk of complications is limited to the time of resorption;
* The non-absorbable, which have the advantage of a lasting effect, but whose side effects late (inflammatory granulomas and small hard balls under the skin) are more frequent.