For quite some time, this was the info on the website of Cardiac regarding Knightvision:

Knightvision is an artists that does not appear that much on a label. But when she creates music, you know it has something special. This mysterious lady is labelmanager of Enzyme K7. In the past she created a lot of classic hardcore tunes. Her tracks are always easy to recognize because of the special atmosphere she creates. The identity of Knightvision is hardcore’s best kept secret.

On October 27th 2017 Patrick van Kerckhoven confirmed in a video on his facebook page that Knightvision was indeed an alias of himself, DJ Ruffneck. He also claims the rumors about it being some mysterious lady were not started by him.