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Some children with CVI are sensitive to bright light ; others require more light ( Groenveld , Jan & Leader , 1990 ) . Visual displays should be simple in form and items should be presented separately or with adequate space between them , since children with CVI seems to have special difficulty discriminating between foreground and background information ( Groenveld , Jan & Leader , 1990 ) . ( Groenveld , Jan & Leader , 1990 ; Morse , 1990 ) . These may trigger a seizure in some children ; consult the child 's physician before introducing these ( Groenveld , Jan & Leader , 1990 ) . ( Groenveld , Jan & Leader , 1990 ) .