Periscope Glasses Let you Spy on Your Own Television
Periscope glasses let you watch TV (or read) without facing the television directly. If you get into being a super spy you can pretend not to be watching television at all while seeing everything in the periscope glasses. Just watch for channel changers trying to sneak up and put on some other TV show.
Watching Television While in Bed
I like to watch television while I'm in my bed. I find just the right position with my head comfortable on the pillow, my back supported just right and my arms sorted out so neither of them is in the way or in danger of becoming all pins and needles. But, I can't always see the television once I get all perfectly settled in. So, it starts over again. Or, I decide to just not watch television in bed tonight - there wasn't anything much on anyway... I just like the quiet noise of conversation to distract my brain from thinking about all the stuff I should be doing, or could be doing, if I weren't trying to get to sleep.
But, sometimes there actually is something I want to watch but I'm too cold to stay up or I just want to be more comfortable. Other times I watch television when I'm sick, sometimes in the front room. Either way, I find the comfortable position and then I can't always see the television.
So these odd looking glasses could be just the thing. You can spy on your own television - seeing the screen even if you are not quite face to face with it. Periscope glasses let you watch the TV even if you are flat on your back and facing the other way from it. Especially nice because you can avoid the glare of the screen on your face.