Isn't this opposed to Lovecraft's claim that nothing he could describe would be as scary as the unknown / the reader's fears?
As well, there are a lot of shock pictures out there that were worse than what I could imagine before having seen them, and looking at them is worse than remembering them. If "worse" refers to subjective experience, then it seems obvious that closing your eyes can help.
Here's the new thread for posting quotes, with the usual rules: