The present invention relates to a smart
hearing aid, a main body of which is a pair of glasses that can project keywords and
key images onto lenses. The pair of glasses comprises a frame and two lenses integrated therewith. A control apparatus is provided inside a side portion of the frame, and the control apparatus comprises a smart
chip and a
projector. The smart
chip can receive external speech, and determine and select keywords therefrom, and the
projector is then used to project the "keywords" and "
key images" onto the lenses, so as to allow a hearing-impaired user to accelerate their comprehension of others' speech by using the
hearing aid in conjunction with the visually
observable "keywords" and "
key images" when the user fails to understand the meaning of others' speech using the
hearing aid alone. Moreover, the smart
chip can convert the received external speech into synthesized sound and transmit the synthesized sound to the user's hearing aid, so as to provide clear and
noise-free dialogue sound, thereby further helping the user understand others' true intent, and facilitating the real-time communication between the user and others.