You may need prescription sunglasses if you wear glasses or contact lenses to correct your vision but want clear sight and sun protection outdoors. If you experience blurry vision, difficulty seeing at a distance or up close, or have astigmatism, prescription sunglasses can help you see clearly while reducing glare and UV exposure. They are especially useful for outdoor activities and bright environments. If you're unsure, an eye exam can determine if you need them based on your prescription needs.