They can see an outline of a letter, but the center is hollow. Some people see the words as a halo. The letters are shadowed. Others may see the page of text swirling. It's a little difficult to keep turning the book to follow the words.
Some people see the text shaking.
It appears that you are trying to read on a bumpy road. Others see the words as seesaws. Some people just see the page as totally blurry or out of focus. Perhaps only a few words are in focus, but the rest need some serious tracking. Yet others see the p age with little rivers flowing down it.