It is very possible to have an eye condition and not even know it; some conditions do not even produce any symptoms. This is why it is important to see an eye doctor each year, something most people neglect to do. An eye doctor can take a thorough look at your eyes and investigate any problems he or she may find.
See an optometrist. As you get older, your eyes do not work as well as they once did. You may not have needed glasses your entire life, but its a good idea to see an optometrist every year, the same as you see a dentist every few months. An optometrist will be able to tell you how your eyes are doing, and you can get glasses if necessary.