A lens would magnify the picture so it would be like looking at a large TVscreen.
透镜会把图像放大，这样就会像看大电视屏幕。
《柯林斯英汉双解大词典》
2
It is a dance routine you will be choreographing specifically to be viewed on a screen, on a computer screen, a TVscreen, in a movie theater, any screen.