Proof Reading.

I would like the facility to call a proof read mode/ button. This would enable a key, preferably right arrow key, to advance the cursor word by word and leave the text highlighted as I go along and proof read my work. Enabling at a glance which text has definately been completed. Once clicked off the highlight dissapears. I always get lost or miss some text when I have to check something or get interrupted.
If there is a method of simulating this (not select and highlight) someone please post. Thanks.