Someone's used their noggin, and put together a simple test for whether your machine has Conficker or not. Since Conficker blocks certain websites, such as those of anti-virus vendors, a web page with inline images from those sites will look wrong. This
"Conficker Eyechart" tests that, so you can see at a glance whether you have an infection or not. (I checked the HTML source: it's just a simple web page, no active content of any kind.)