Player Preferences Resolution Question

Hi there!

I use this code to set the resolution I need.

PlayerPrefs.SetInt(RESOLUTION_PREF_KEY, currentResolutionIndex);

I use this code to find out what the previous resolution was for next time I load the build.

currentResolutionIndex = PlayerPrefs.GetInt(RESOLUTION_PREF_KEY, 0);

The issue I have is that when you load the build and change the resolution it still thinks it's the resolution that was set in the code. So if I left it at 800x600 when I last played, but this time I want to load it at 1900x1600 it still thinks its 800x600. Is it possible to find out the resolution chosen when you start the build? Thanks!