can we retain our eye sight

Look into Lutein. Its a supplement to help your vision. www.puritanspride.com should be able to give you more information, or possibly even webmd.com. Lots of luck to you and I hope you find something that works well.

You can increase the amount of vitamin A that you eat! try carrots and squash for two good sources. Also it is important to blink often, and maybe eye drops can help! Otherwise, I will say to turn off the computer and do something else! Take a break every so often to rest your eyes. Just close your eyes wherever you are, except while driving or walking, of course then keep them open! reading can strengthen your eyes so it is good to read books, not just online but real books!