I'm not sure if you are aware of these products, so I figured I'd let you know in case you aren't. Since you mentioned you have eye fatigue due to working in front of screens all day, there are a variety of glasses specifically designed to reduce eye strain from looking at monitors and tv screens. I'm not familiar with all the brands, nor have I tested them nor am I familiar with how good they actually work. But it might be worth researching. Here is the most well known brand: http://www.gunnars.com/shop/Advanced-Computer-Eyewear/

If you have a CRT or LCD monitor, you might consider investing in an LED monitor. Although more expensive, these monitors will strain your eyes less. If you have a CRT and cannot afford an LED, at least upgrade to an LCD.

Here is another article you might find useful: http://www.allaboutvision.com/cvs/computer_glasses.htm