There are numerous text to speech apps available from the Google Play online store.  The benefit of such apps is that large documents can now be read to an individual, which may alleviate any strain caused by reading such documents. Some of these apps rely on a good internet connection to work.  This link will take you to the Easy Text To Speech app download.  You may find this suitable or you may find one of the other numerous text to speech apps more suitable to your requirements.