Is there a way to reduce computer-use related eye strain and still use a computer 6-8 hrs a day?

Yes! First, make sure your glasses are appropriate and the clearest they can be. Adjust your ambient lighting for least glare. Use artificial tears if necessary and practice the 20/20 rule: at least every 20 minutes, look up at something 20 feet away for at least 20 seconds.
Yes. Our eyes are designed to see things in 3d. When you look at a computer/book etc for a long time (a 2d surface) you can strain your eyes or get dry eyes. Every 20 minutes rest your eyes for 20 seconds by looking at something at least 20 feet away.