You have to have good peripheral vision and you have to really concentrate.
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(ROOT (S (S (NP (PRP You)) (VP (VBP have) (S (VP (TO to) (VP (VB have) (NP (JJ good) (JJ peripheral) (NN vision))))))) (CC and) (S (NP (PRP you)) (VP (VBP have) (S (VP (TO to) (VP (ADVP (RB really)) (VB concentrate)))))) (. .)))
It takes extreme focus and a strong awareness of your visual surroundings.
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(ROOT (S (NP (PRP It)) (VP (VBZ takes) (NP (NP (JJ extreme) (NN focus)) (CC and) (NP (NP (DT a) (JJ strong) (NN awareness)) (PP (IN of) (NP (PRP$ your) (JJ visual) (NNS surroundings)))))) (. .)))