In a darkened room at Toronto's Hospital for Sick Children, a baby, its head dotted with electrodes, sits in its mother's lap and watches flashing black and white checkerboards and stripes on a television screen. Soon after the test, doctors will know if the child can see and how well it can see. The testing procedure, which involves measuring brain wave activity prompted by visual stimuli (also called visual evoked potentials or VEP's) has been perfected by Drs. Barry Skarf of the Department of Ophthalmology and Moshe Eizenman of U of T's I ....