There is some powerful signal processing going on in the brain so we can see and hear. That's how you can hear someone talking in a noisy bar - if you record the conversation and play it back later, you won't be able to understand what the other person was saying.
There are a number of reasons why something like your experience can happen. Meditation, certain drugs, a brain tumor are some that come to mind, but I am not a specialist and no expert.
If it's a one off, I wouldn't worry, but you might want to see your doctor if it starts to happen regularly.
I've had a couple of weird visual experiences riding with a mirrored visor on a sunny day. It's like applying an Instagram filter - my colour perception somehow changes. Quite pleasant but I can snap out of it immediately. My vision is still fine when it happens.
I usually ride with a light smoke visor now, which has never had the same effect unfortunately!
Last edited by NZ_R1; 08-25-2018 at 02:13 PM.