Do eyeglasses really help bad night vision?

Yes. At night, your pupils dilate. This (along with a few other changes that occur at night) may cause a temporary change in your glasses prescription leading to "night myopia" or slight nearsightedness at night. This makes many people feel as though they have "bad night vision" but really a small glasses prescription to be worn at night particularly while driving can help night vision.
Yes. At night, most people become slightly nearsighted, so glasses can be quite helpfulseeing in the dark. Also, since humans are not naturally nocturnal, glasses help us see better for night driving. Driving in the rain at night is the most difficult for people due to glare and reflections. This is even worse if a person has cataracts, which adds even more glare.