I'm not sure what it is. I'm coming from a 15" notebook, but I don't think that the physical size is the problem. Is it possible that the more dense resolution is what's causing it? A lot of times after using the MacBook my eyes just randomly blur out. It's getting pretty annoying. Sometimes when I look at it it's too bright, but it's on the lowest brightness setting. If anyone has any tips I'd appreciate it. Thank you.