Try holding the text further away from your eyes and practice reading as many words as you can in one block or section of the text. Try to increase the number of words you read at each try. Your brain will eventually be trained to retain more of what you read. Increasing the number of words will take concentration and requires a lot of effort and time to learn, but the more you practice, the faster your reading will become.
Practice reducing the time you concentrate on each section while still retaining the information. According to Mindtools, a block or section of text may be read in up to 0.25 seconds. If you urge yourself to practice reducing fixation time, you will be surprised at how quickly you will be able to retain what you read.
A tool to keep yourself from re-reading what you have just read (otherwise known as "skip-back"), find something to point with, whether it be a pen, pencil or your own finger. Run the pointer underneath the words as you read them. Avoid returning to what you've just read. This technique will cause the flow of your reading to become smoother because you are not skipping back. The faster you move the pointing device, the faster you will read, while reducing skip-back.