Not only is it an optical lens, it's a COLOR optical lens
yeah the corner viewfinder works too. The manual touts the waist-level viewfinder for those users who wear glasses. Funny, I wear glasses and I don't seem to have problems with viewfinders...

The front seems to be plastic, not glass so it's more like plastic covering plastic I missed out a photo of the lens cap which helpfully says CAMERA on the front, in case you weren't sure what it was.