I don’t experience this every day but quite often.
The only way I can explain it is that it feels as though the back of my eyeball has dried out and is sore and kind of stinging, it really doesn’t feel as though it’s from the front of my eye. It’s something I will usually wake up with and very rarely is it in both eyes although I do experience it in either one eye or the other just not at the same time.
Eye drops don’t appear to help and all my sight tests are always ok.
Any idea what could cause this?