A portable device for the optical signal transmission from and to the human eye, in which it is proposed that a rod-shaped housing (1) is provided, on the two end regions of which at least one emitter (3) and/or detector of electromagnetic waves is arranged and which has a holding clamp (2) in its middle region, wherein a power supply for the respective at least one emitter (3) and/or detector as well as a control unit (8), which is connected to the at least one emitter (3) and/or detector, are provided within the rod-shaped housing. The invention provides a portable device for the optical signal transmission from and to the human eye, which can be worn with a high wearing comfort in a discreet manner in the vicinity of the head and, and in particular allows the device to be worn in parallel with commercially available spectacles. Furthermore, the handling, storage and transport of corresponding devices are greatly facilitated.
