Eyes are finicky and if it's still a problem, you might want to see an eye doc. Sometimes it's virtually "nothing", it's just that it's hard to know yourself. Ocular migraines can cause that. They usually start with a minor blind spot, and then develop into patterns or rainbows, then wanes and a mild headache might set in. But strange vision like that can also indicate something weird going on in the retina. And you don't mess around with that because it's the part of the eye where light is projected. So if something is up there you want a doc.

So who knows?