As I have gotten older my eye sight seems to have deteriorated and I found that I needed glasses for reading a book to watching TV. After a while I had a pair of reading glasses in every room in the house just in case. Heaven forbid I should forget them when going shopping. In fact a couple of times when I forgot I ended up buying another pair of reading glasses! What a waste of money.
I then discovered a program that Dr. Williams Bates developed to help school children absorb more knowledge without putting a strain on their eyes. I found it fascinating that he proved that when you have to read a lot of material at once your mind gets tired and as a result your eyes start to strain.