The busy professional is subject to the possibility of eye strain brought about by a number of reasons including but not limited to prolonged periods in front of computers.
Some simple suggestions to reduce eye strain include:
Blink often
Ensure you have adequate lighting
Take frequent breaks when working
Sit correctly - with your seat well positioned and your eyes in line with your computer
When reading hold your book at least 30cm away from your face
Wear good sunglasses that provide adequate UV protection