There are a number of technologies that can assist in conveying the information on a web site to those who have difficulty viewing or reading the text.
One specific type of technology, which can be used on this web site, is screen reading technology. This technology can be used to read out loud the textual content of a web site.
There are a number of pieces of software that will speak aloud the content of a web page or text that has been selected. This software comes in the form of specialised browser, browser plug-ins and stand alone software.
Such software comes as commercial software, for which there is an associated cost or a free software. This software comes with varying features.
There are also a number of commercial pieces of software available at varying cost.
You can go to the BBC’s website for more detail on screen readers.