Maybe we can convince @ambermalika to put on her physiology detective hat again and do a deep dive on this one? 
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Well, I blew my theory yesterday. I prehydrated with 500ml water and electrolytes, 2 weetabix and cocopops pre-ride, 2 bananas during ride and approx 1,500ml water during ride. 30km, 900m climbing, 3.5 hours MTB. And I had fuzzy eyes and headache for the rest of the day 
Maybe its low blood sugar as mentioned above 
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Generally just water and some oatmeal or toast
I suffered bad from migraines as a kid (circa 25 years ago) that would at best cause me to vomit and at worst blackout. It all culminated with a period of epileptic fits. Then my eye sight started to fail and I began wearing glasses; it might be a coincidence but that seemed to stop things.
I occasionally get headaches now but thankfully no migraines and dehydration is usually the cause.
I’m going to take a different tactic here and suggest this may be exertion headache related to neck position. I got them when I used to squat, especially higher rep sets, if I looked up during the set. My gp explained something about this, but this http://www.apexllc.org/articles/exertion-headaches/ puts it well.
Could be totally off base, but worth a look.
I’m very similar in that I get ocular migraines sometimes after more intense workouts/rides. It’s not just cycling but hard runs can trigger them as well. Only seem exercise related.
As others have said it does seem related to hydration/fuelling as I would notice them more if I’d had a boozy weekend and trained in a Monday or if I had not eaten/drank enough before or particularly after the ride i.e waited an hour for a main meal rather than having something straight after.
I think they have reduced somewhat since really focussing on the possible cause but still get them every now and again. Usually a couple of Aspirin as soon as I feel the symptoms and some carby/sugary food really reduces how bad they are and doesn’t stop me training the day after one which they used too.
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