(another migraineur chiming in here)

It's a common misconception. What you're calling "ocular migraines" are more accurately referred to as "migraines with aura without headache", sometimes called "silent migraines". You can get actual ocular migraines as well, but those affect the eye (or optic nerve), and as such, are limited to the eye. Scintillating scotomas caused by migraine auras are visible with your eyes closed, and look the same in both eyes.

The image you linked is what I'm calling "flickering". My full-blown scintillating scotoma is much more vivid and fully-formed. In the incident I'm reporting, it was a 3D physical-looking structure of triangular prisms made of white light, with zebra stripes of utter blackness sweeping rapidly along them, surrounded by an aura that looked like a cross between the sun's corona and the aurora borealis.

These links are closer to what mine look like:

https://i.imgur.com/mbW2UZY.jpg

https://optometrui.tumblr.com/image/132973031235

Your first link is exactly what it looks like to me (except pulsing/shimmering). I can usually sense it before it starts then it starts as a small aberration and gradually grows to encompass almost my entire vision. Extremely unsettling the first time it happened.

Yeah, mine are always pulsing, shimmering, whirling, or moving in some other way--most often more than one way at once. My earliest ones were like a black hole in the middle of my vision with an aurora borealis slowly radiating ouward while color changes whirled around it at high speed.

Fascinating. The first image is exactly what mine look like but I was told (by a doc) that they are ocular migraines.

I'm no expert; perhaps when I see those, I'm having an ocular migraine.

If it's actually an ocular migraine (which takes place in the eye) rather than a scintillating scotoma (which takes place in the brain), that's a possible explanation for why I could continue reading. The UK's NHS says they tend to happen in just one eye, so if I was having an ocular migraine, it might have left my vision unobstructed in the other eye.

On the other hand, if that's the explanation, then I would sort of expect to have consciously experienced seeing the book while I was reading it, and I didn't--or if I did, that's not the way I remember it.

Of course, memory is untrustworthy, and it's also possible that the vividness of the ocular migraine might have persuaded my brain to tell me I couldn't see the book even though I could.

So ocular migraine is a solid alternative candidate to explain my experience. If I have another scotoma, I'll see if I can figure out a way to determine which thing is going on. Maybe closing one eye and then the other.

One time I was at a friend's house with my laptop and lowered the screen light during the night but forgot about it. The very next day, while working, I started to get that "aura" migraine.

In general, when this occurs, I stop doing whatever I'm doing, take a ibuprofen pill and go to bed for 20 minutes. After that, I have a massive headache but no aura.

What was odd is that the very next day, I got the same migraine, again! This rarely occurs to me (two days in row).

It was later that I realized that the screen light was low and that might be an explanation about why I got two migraines in two days.

Hopefully it can help someone else here :)

I get these every couple of months!

Sometimes with accompanying headache, sometimes without. That picture is a great representation of what I see. Although I would say its usually more silvery and shiny. Dunno what triggers it, I've had it sitting watching TV, tryjng to work on computer (which becomes impossible) and just sitting in a restaurant eating lunch.

Normally lasts half an hour or so. Also sometimes I can be left feeling fuzzy and foggy for a day or so after.

Like you say reading just becomes impossible!

Have you found any good medication that helps when they trigger?

I get these at my center of vision when I focus close (less than half a meter) for a few minutes. They're annoying because I can't do work that requires me to look very close for too long, but seem to have no other symptom, and no doctor has figured out what they are.