Seeing colors outside of a Ketamine treatment. Is it normal?

I have had a total of 10-12 ketamine sessions with healthcare. I struggle with migraines. Today I took my migraine medication and put the mask as I normally do to relax, and opened my eyes, started focusing on the darkness and suddenly I see colors moving as if I was in a session. It wasn’t as intense as I would normally feel at the clinic, but like a 5-10% of what I usually do.

How is this possible? Is it because of the migraine? I might be having a migraine with aura?

Help me understand