Final answer:
NS cataracts progress slowly, causing the lens to become cloudy and leading to blurred vision and sensitivity to glare.
Step-by-step explanation:
NS cataracts, or nuclear sclerosis cataracts, are a type of cataract that affects the center of the eye's lens. They typically progress slowly over time. As the cataract progresses, the lens becomes increasingly cloudy, leading to blurred vision and difficulty seeing clearly. In advanced stages, the lens may turn yellow or brown, and the person may experience increased sensitivity to glare.