Instrument (10) comprising a squared board (40) on which are squares (41, 44) corresponding to the keys of ordinary keyboards of a computer (11), each provided with a phototransistor (42) that by means of electronic circuits comprising an electronic motherboard (50) equivalent to that associated to the keys of ordinary keyboards for computers (11), connected through an electronic daughter board (51), upstream to the squared board (40) and downstream to the computer (11), transmits to this latter pulses equivalent to those that it would receive by compression of the keys corresponding to said squares (41, 44), as soon as the phototransistors (42) receive a beam (75) of concentrated light from an emitter (70) fixed to a device (60) that can be worn like spectacle frames on the head of a handicapped person (15).
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