There are cases where no amount of magnification, contrast or colour manipulation can enhance an image in order to make it “visible” to the user, even where such a user still has some sight left. Naturally, in a case where the user has no light perception at all, sight is unavailable and the solution requires other inputs. In both of the above descriptions, we are faced with a blindness scenario.
A blindness solution relies on two primary features namely audio and tactile. We define audio as the use of speech, real or synthetic, to read information to the user. Tactile on the other hand is the use of either braille or tactile graphics to represent information or images to the user.