Eye lashes would be a very uncommon causes. If it were your eyelashes, you see the line, you retract your lower lid and it goes away, and you have long eyelashes then carefully trim them. I suspect that not the cause. This has been discussed many times here. There are many causes. If it was dry eyes then the line should go away after a blink or when you put in artificial tears. I cannot tell you the cause since so many: needing glasses, improper glasses, cornea problems including regular or irregular astimatism, lens problems macula problems. I cannot offer any further insights.
I have the same problem, I had IntraLasik eye surgery 6 weeks ago and after 2-3 weeks I started to see very annoying light streaks from light sources when blinking. It is especially terrible when driving at night, but I also can see them from TV or from a daytime window. The streaks disappear when I open my eyes, but every blink is terrible. Sometimes I use artifical tears and I tried many kind of tears but they just make it worse for a while and doesn't help. On the 1 month controll test my doctor said that everything is okay with my eyes, but I'm sure something is wrong because I never saw these light streaks before my surgery and I didn't notice them for 2-3 weeks after the surgery, which makes it more inexplicable. Maybe it is my eyelids because when I lift them, the streaks dissappear, but how eyelids can be related to the surgery? I hope that I will find the solution, but I read lots of people here who have this problem and none of them found it. What kind of tests or measurements could be beneficial to find the problem?
Duraityt did you have any laser treatment on your eyes sometime in the past?