One of the possible reason for your blurry vision especially when trying to focus on distance objects is that you got near-sighted as well as a little astigmatism. This is probably caused by overusing eyes and eyes not getting enough rest. When people are watching things in short distance for too long, then the ciliaris has to stretch to the opposite direction when people want to see things in long distance. Therefore the ciliaris will be very fatigue, which will make itself take a longer time to stretch and adjust crystalline lense. As time goes by, it will lead to near-sight. To reduce eye fatigue, you should do some eye exercises regularly and give your eyes more relax, for example, take a rest after an hour's reading or using computer. Also, you can use some eye drops to moisten your eyeballs and retard the stretch of eye muscles. If the blurry vision is still serious, then you had better go to the doctor's for an eye examination to see whether it is a pathological changes of the eyes.
