My Vision!!!

Dear Diary, I have been having headaches later in the
day. It is usually after I have been working on my
job. I thought maybe its the strain on my eyes or
having to be at the computer desk for too long. Now I
am going to break up my routine and focus my eyes on
things other than the screen so I can relax. Hopefully
I dont need glasses. What you think? Have any of you
been having problems with your computer vision ?