The Brazil U-17 footballers here yesterday were seen improving their peripheral vision, which is unusual in football practice sessions. Peripheral vision is the ability to see objects and movement outside the direct line of vision. It's a side vision. It is, "the work of the rods, nerve cells located largely outside the macula (the centre) of the retina," says medicinenet.com.

A Brazilian player places a black piece of paper in front of teammate yesterday. Pic/Kashinath Battacharjee