Lately I've been using a different type of drop -- comes out as a gel/ointment. Recently I've noticed matter in my eyes at different times of the day; I can feel it, but I can't rub it out. I blink and it blurs my vision. I blink again and it goes away. I haven't been using the new drops consistently, but this new problem has arisen at about the same time that I started the new drops. Could this be the cause?