Anything that makes it easier for people with dyslexia to read has got to be a good thing.  I have been using the Kindle for many years and did not know that it had this function on.  I am really pleased that these companies are trying their best to help people with learning disabilities.

The Kindle is designed to make it easier for individuals with dyslexia to read, and many people with dyslexia agree they do actually find it more accessible.

The font used is called, ‘OpenDyslexic’. The typeface, includes standard font styles, such as regular, bold, italic, etc.

Go to the settings page, pick out ‘font’, and you will see ‘OpenDyslexic’ on the right-hand side.

If you have older Kindle’s, you can get an update here:
Kindle Update v5.7.2 Adds Open Dyslexic Font, New Home Page (Screenshots) | The Digital Reader