It often happens to me that after learning the whole day and reading lots of text especially with small letters I feel my eyes very tired. Who knows good set of exercises that don't takes lot of time, that helps to prevent eyes tiring.
Here is a link to WikiHow on Eye Exercise to reduce eye strain: http://www.wikihow.com/Exercise-Your-Eyes
A Google search for "exercises to reduce eye strain" yielded many helpful results.
Please let us know if you have tried any of these and how they work.