Contact lens would help cosmetically. Regarding exercises: Every 20 mins take a break for 20 seconds and look at a distant object that is atleast 20 feet away. Due to work we tend to blink our eyes a lot less. Don't concentrate so hard on the screen that you blink very less. Keep blinking consciously. Constant sitting in an air conditioned office room cause dry eye. Use humidifier in your room. Eat amla, carrots, yellow and green fruits and vegetables, fish, etc. Keep yourself adequately hydrated.