I sometimes see parallel red lines. It's kind of weird and I don't know what it is. Has anyone else heard of this?

So every once in a while, at random times, I'll start seeing several, parallel red lines, they look like a beam from a laser. They are spaced evenly, are perfectly parallel, and run horizontally. I don't know how many rows of them there are. When I was little it happened a lot more frequently, and then it stopped happening for a few years. I had forgotten about it up until maybe a month or two ago, when I saw them again. Now it happens randomly, and usually I only see them for about a second. It's like I can see them but they aren't there, almost like a cross between thought and reality. It's just weird though because it is a structured pattern, and it is consistently the same. Plus it happens when I am not thinking about it, and I can actually see them. Anyways, does this sound like a known thing? Any informative answers are appreciated.