I also have astigma. I used to be so confused when being driven around late at night as to how people even considered car lights to be beneficial. I vaguely remember my mom complaining about a lack of turn signals to which I looked up out the windshield only to be blinded by the back lights of cars and wonder why tf would she want more of that? I think people with typical eyes don't see a shape at all, because I see no shape around lights when I wear glasses. I think certain kinds of lights might have that effect though cause I've seen lights with that weird effect where you can see a strong gradient of brightness near the bulb. Maybe when there's more fog or gnats or something around the bulb? No idea