Viewing colorful sunsets, taking in the sights of a new city, watching your kids grow older — your vision is one of your most precious senses. You only have one pair of eyes, and keeping them healthy should be a priority. Recognizing the symptoms of a vision problem early could prevent permanent damage or blindness. Don't take your sight for granted — learn how to spot the warning signs of these 14 diseases of the eye, and how to protect your vision.