First of all, the vision in my left eye is fine but the vision in my right eye is pretty blurry if my left eye is closed. I usually only need my glasses in school because my vision is fine if both eyes are open, but I am near sighted and I need to see the board in school. A few days ago, I woke up and my vision was more blurry than usual. I thought it was just sleep crust or something in my eyes since I had just woken up, but I took a shower and a few hours later my vision was still blurry. I've been wearing my glasses every day since then but my vision hasn't changed. What's going on?