Visual disturbance can be associated with migraine, and can be with OR without accompanying headache, so your mention of the headaches, coupled with the apparently short-lived nature of it (How long is “a while”?) makes me wonder if it might be that.
Colour distortion can also be associated with optic neuritis (a very common symptom of MS), yet I would expect it to last longer, if it was that.
I sometimes have colour distortion in very limited circumstances, such as viewing certain fonts, on the computer.
Once or twice, I’ve been amazed that someone had taken great pains to send me an email in different red and green fonts, alternating from letter to letter, before realising it was in fact normal black and white, and my eyes were seeing false colours. Yet even looking at a different font, somewhere else, did not replicate the problem.
Looking round the room, colours appeared completely normal.
I’ve no idea why I should have colour distortion only with certain fonts, or you ONLY when looking at Lissy!
For peace of mind, I think you need to report this to your neuro, GP, or MS nurse, as I doubt anyone here will be able to give you a definite answer.
I reported my issue with the fonts to my neuro, but although it went in my notes, nobody seemed that bothered about it. I suspected ON, naturally, but the funny thing is, I’ve never been diagnosed with that. VEPs were normal, when I was first diagnosed, and subsequent routine visits to the optician have found nothing, even though I’ve highlighted that I have MS, and that ON could be a possibility. Optician seemed quite dismissive. When I told him I have MS, he almost snapped: “Well, there’s nothing we can do about THAT!”
I wasn’t expecting him to: I just thought if he was testing my eyes, he might find a few “funnies”, and should be warned I have a chronic underlying condition.
Please do report it, but I can’t guarantee you will get answers, or even that the so-called experts won’t just shrug, and say: “Well, you have got MS, after all…”