I see there has been at least one other thread on this but I would like to ask a few questions.
Are the Pi camera lenses glass or plastic?
Do they have any UV protection?
One of my Pi's primary duties is so I can see in front of my home while I am working to watch for deliveries and to make sure nobody is coming by for a visit if my dogs are out. As such, my pi spends 2-5 hours in direct sunlight every day (indoors, on my window sill behind double pane glass). The view out it seems to be getting steadily less focused or blurry. If it simply cant hold up over long periods of time, fine I can make other arrangements. This Pi has been in that window since early 2015. Its due for a case replacement as it is.