So I clicked on this thread hoping to read there is a simple solution.
Instead I am just number 1xxx.
Got my new Macbook Air 2018 last week. Extremely blurry camera from the beginning in any app and with any user.
Previously I had a Macbook Air 2013. The quality is way better. If I copy the Air13 foto to the new mac it is still way better so the "better display makes it look worse" argument is nonesense.
Also the image received by someone Facetiming or Skyping with me is worse. WAY worse.
I am also having a problem with battery that is doing nowhere near as long as promised (also less long than the 5 year old Macbook Air, whose battery never got changed) and guess I have to return it.