An optical adapter includes a support, which can be removably coupled to an image acquisition device. The support has a substrate made of substantially transparent material. The substrate has a proximal surface intended for facing towards the device and a distal surface located at a distance from the proximal surface and intended for facing towards an object to be observed. The support also has a lens located in a seat obtained in the substrate and facing towards the objective of the device. In addition, the support has a reflector located laterally relative to the lens and arranged for facing towards a light source integrated into the device and conveying the light emitted by the light source in a transversal direction towards the lens and past the distal surface.
