- If you experience eye fatigue quicker than usual when you're doing some activity that you normally do, like working on a computer;
- If your eyes get tired earlier in the day-say you can't read in bed anymore, though you used to read before you fell asleep;
- If it takes your eyes a little longer than normal to recover to bright lights you see at night (say 7 to 10 seconds as opposed to 3). This is especially evident when you're driving.
Find out more about this book:YOU: The Owner's Manual, Updated and Expanded Edition: An Insider's Guide to the Body that Will Make You Healthier and Younger