Well, generally speaking, according to some experts, peripheral vision is very important in sports performance. And also, you should know that peripheral vision goes into your brain 25 percent faster than your central vision. By the way, about 20 percent of your peripheral nerves aid your ability to remain balanced. In common, you can try some exercises to relax and improve your peripheral vision. For example, you can concentrate on looking as far out to the side as you can while slowly taking deep breaths. In this way, this peripheral expansion exercise will relax the visual system. Also, you can try a form of meditation called Hakalau which was used by the ancient Hawaiians to practice focusing on peripheral vision. Anyway, just have a try.