Night blindness is the inability to see well at night or in poor light. It is due to a disorder of the cells in the retina that are responsible for vision in dim light. It has many causes, including Vitamin A deficiency, myopia, glaucoma medications that work by constricting the pupil, cataracts, retinitis pigmentosa. To determine what is causing night blindness, an eye doctor will perform a thorough eye exam and may order any of a number of specialized exams. The treatment will depend upon its cause. As the lack of VA is the most common reason, you could eat more liver, carrots, cod liver oil, vegetables and fruit to supplement VA. In general, night blindness alone will not lead to eventual blindness.
Not necessarily, it just means that it is difficult for you to see at night. You should continue seeing your eye doctor for yearly tests, or any time you have changes in your vision.
I hope not because I can't see at night!