Many Visual Studio users have reported blurry fonts in the text editor. I had this problem and was very annoyed by it. By accident, I found a fix. I hope it works for you, too:

  1. Close all instances of Visual Studio.
  2. Open regedit.
  3. Open the tree HKCU\Software\Microsoft\VisualStudio\14.0\Text Editor\Global Options.
  4. Examine the DWORD key TextView/ZoomLevel (yes, that's really the name). This is the percentage value by which VS scales the text editor font.
  5. If the value is anything other than 100 (decimal), set it to 100.
  6. Close regedit.
  7. Reopen Visual Studio and (I hope) enjoy the clean font that's (finally) the same as the one displayed in the "Sample:" window in tools/options/environment/fonts and colors!

This fix might also apply to other versions of VS, but I haven't tried it.