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.
The language support for the two environments is quite different. VBA projects support the VBA language, which is based on Microsoft Visual Basic 6.0. Visual Studio Tools for Office projects support Microsoft Visual Basic .NET and Microsoft Visual C#.