Normally when I'm outside if i look up at the sky i see a small curved line in the bottom left corner of my left eye. But when i look up i see it then it goes away. Then if i look somewhere else i see it again then it goes away again. I also see floaters in my right eye when it is bright outside. I have been to the optometrist and had my eyes dilated but nothing was found. Any idea what this might be?