When we open our eyes, we see images. But when we close, we also can see. During sleeps, our eyes are closed, we dream n we can see images n even 4d numbers, ha ha! So, a device that let us see when our eyes closed wouldnt be great? But might need operation to send image to our brain. Or works like the dream, or am i dreaming.
Like that we wouldnt need to open our eyes when reading books, looking at monitor, taking a short walk. More rest for our eyes to attract the opposite, esp for girls, heh heh! I got this idea while i taking a break while my hands turning the pages of a magazine. If i can see the content with that device, wouldnt it be better?