hello, I'm a 17 year old girl. i wear glasses and have astigmatism. lately I've been noticing that i can't see well at night. do i have to get checked for that or is it something that can't be fixed? I've also noticed that i see darker out of my right eye during the night. and out of my left eye i see just fine. it's just that out of my right eye everything just looks black and i can't see a thing. why is this? thank you!(: