The causes of macular edema are numerous and different causes may be inter-related. It is commonly associated with diabetes. Chronic or uncontrolled diabetes type 2 can affect peripheral blood vessels including those of the retina which may leak fluid, blood and occasionally fats into the retina causing it to swell.
Visual C++. Visual C++ is known as a native development language, as it talks directly to the hardware for the Windows Mobile device, with no intervening layers (unlike Visual C#, for example). Programming using C++ can be challenging, as it is not a trivial language to learn.
But Python isn't only a web language. Python is the primary language used for the massive cloud computing project OpenStack, powering private and public clouds in data centers all over the world. It's also used to write desktop software, like Calibre, OpenShot, and the original client for BitTorrent.