From the download page: The Microsoft Consolas Font Family is a set of highly legible fonts designed for ClearType. It is intended for use in programming environments and other circumstances where a monospaced font is specified. This installation package will set the default font for Visual Studio to Consolas.
To give you an idea how this Consolas looks like in VS I have created a before / after screenshot comparison - here is the "before" screenshot:
And this is how it looks after installation of the Consolas font pack: