It helps you to sidestep objects on the ground and avoid bumping into walls as you walk. And if you drive a car, peripheral vision can alert you that a pedestrian has stepped off the curb.
इसी की बदौलत आप दाएँ या बाएँ से आपकी तरफ आनेवाले किसी अजनबी को देख पाते हैं ।