In general, night blindness, whose symptoms are that people are unable to see things clearly when they are in dark at night or in environments with dim light. It is usually caused by the lack of vitamin A, malnutrition or pathological changes of the retina rhabdocyte cells. And some are inborn hereditary night blindness. As for cataracts, this kind of eye disease is caused by lens phacoscotasmus because of aging, inheritance, metabolic disturbance, trauma, radiation, poisoning, topo-malnutrition, and so on and so forth, which lead to the damage of lens phacoscotasmus peplos or degeneration of the proteins in the phacoscotasmus, making lens opacity. The main measure to treat the cataracts is to take a surgery to remove the bad lens phacoscotasmus, and sometimes people can use artificial phacoscotasmus to take place of the old one.
Cataract is the serious eye problem which makes your cornea look not clear. Once you get cataracts, you may not see things that clearly. You may see things in the blurry state. You may also get night blindness. I suggest you to take more vitamin A to cure the night blindness to get the right vision. You should also have good rest for the eyes, not sitting in front of the computers for a long time.
All right, it seems that you know little about cataracts, anyway, it is one of the most serious problems with our eyes. Cataract could make your crystalline lens blurry and thus prevent light from getting into your eyes fully. However, there is no definite relationship between them, but I shall remind you that cataract is usually accompanied by night blindness. You just have to take immediate medical care and treatment.