Okay, so i've had this problem for a while and no opthamologist or optomotrist can find out what it is. What i can confirm is that it most likely doesnt have anything to do with eye strain, dry eyes, optic nerve or tear duct as they have all checked these. The problem is my eyes feel irritated almost 24 seven now. Its the feeling as if your eyes were focusing on a knife really close to your face but that feeling occurs when looking at anything. I can tell you its at its worst when im very tired at night. But I also found out when i place my fingers on a certain part of my eye, i feel a very fast pulse going through. Id rather call it a very fast but faint vibration going through very small and certain parts of my eyes, more specifically, through my eyelid. It may be a seperate problem but sny info can help me. Thanks ;)