Conficker Eye Chart - Baylor Mirror
basically, if all the picture show up, that means you don't have conficker or it's just normal.
2nd one is if 3 of the pictures on the top row, you possibly have Conficker C variant.
3rd is if one the left and right one on the top row are not showing, you might have conficker A/B variant.
This isn't mine by the way. The link isn't though. I just wrote the rest.