I went to a local dealership and sat in a Prius EV. Nice car. When I did a rear vision check I could delineate some objects behind the split glass/spoiler but was left wondering - "why do they need to make that split piece of glass darker? I think the tonneau cover was under that piece of smoked glass so I can't think it was for security purposes?
Headlight glare is also my best guess. It does a pretty good job of limiting glare. The spoiler is also at just the right height for me to block most rear headlights so that I don't get bright lights shining in my eyes in the rear view mirror. Many ppl complain about this design, but I really appreciate it.
My only complain for this glass is it's colour. It would be better if it could be better matched with rest of the windows. Maybe neutral gray? Colour aside - I like it. Except in winter (lot of salt on roads) where this part of rear window is just unusable.
My car was purchased from the dealership with dark tint already on it and that area is tinted as well. It's literally only useful during daylight hours. At night, I can't see anything out of it. It's not a major issue right now because I drive the highway at night but going out in the city and parallel parking would scare me into purchasing an aftermarket back up camera as I do not have one
