If you just only see some spots or halos around the bright light, it is normal, especially when you tired. I also have such experiences. Usually, the spots around the eyes are caused by the staring into bright light. It is juts line a flash going off in front of your eyes. If this sport goes away in a short time. It is OK. If it this spots always here in front of your eyes, i suggest you to visit an ophthalmologist. Since you have no knowledge about it, you'd better not decided it by yourself from reading some introduction online. Just see a doctor and take the right treatment.