There are many ways to aid reading, and one that many dyslexic individuals have found useful is to change the background colour. This can be by using coloured paper, or it could be by changing the background colour on the screen. There are several says to do this.
By changing browser setting - this can override the website colours, and can be accessed through browser Tools/Options.
By changing preferences in programs such as Microsoft Word and Acrobat.
By download programs such as T-Bar, a simple tool that you can make bigger and small, and choose any colours you wish.
The last is the best I have found, and it is free.
And how do you know what is right for you? Try www.wdnf.info/colours/en/