It's my understanding they're both acceptable. Cross-eyed is a way to describe it for people who have never done it before.

You cross your eyes until you get into that blurred vision state. It will feel different for everybody. The term blurred vision works for me now, but when we first started, it didn't--but cross-eyed did.

It was a way to tell people how to start putting their vision into that position. A'sha at one of the first workshops I went to said something about crossing your eyes until you get to that blurred vision state.

However, there are 12 different positions for looking at codes. They each do different things--don't ask me what they are, because I don't know. But A'sha said it's something you can play around with.

However, Jo, the main thing is YOU KNOW that the blurred vision works and that it's a "way of crossing the eyes." We are given the term cross-eyed--then it's up to us to find the correct spot "for us" that  cross-eyed describes.