1. A reading device for blind or visually impaired persons for recognizing and reading text passages, comprising: an image capturing unit being configured to capture an image of an environment of a blind or visually impaired person and to output image data corresponding thereto; an image processing unit being configured to process the image data such that text is recognized and extracted from the image data and to output text data corresponding thereto; a text outputting unit being configured to output data corresponding to the text data in a form noticeable or convertible to be noticeable by the blind or visually impaired person; a housing comprising a first part and a second part, the first part having the image capturing unit attached thereto and the second part accommodating the image processing unit and the text outputting unit; and an adjusting unit coupling the first part and the second part of the housing with each other and being configured to define an operating position in which the first part of the housing is spaced apart the second part of the housing and a non-operating position in which the first part of the housing abuts against the second part of the housing to accommodate the image capturing unit, the image processing unit and the text outputting unit in the housing.