It's funny how sometimes my right eyes will just go "Nope!- I'm out".
It is seriously annoying. I'll been trying to read something or focus on something and it'll seem like there's a hair or something directly in front of the right eye. But it's not, when I close my left eye I can see white-ish in the dead centre of my vision. I notice it even more when I'm wearing my glasses. So much that it generally triggers a headache.
Even though I know that it happens, I still keep rubbing in my eye instinctively as though there is something in it. Deeply frustrating.