That seems silly to me. Talk about random thing, ask "No image at all/Dim and vague; flat/Moderately clear and lively/Clear and lively/Perfectly clear and lively as real seeing", average results. I mean... you could ask this once with prompt "How vivid is your visual imagery" and you will probably get the same result.
Those are made up categories for a made up disorder.
That's like "depression". There is no one kind. How depressed are you? Very? Not so much?