Adults can also get pink eyes. Pink eye is infectious conjunctivitis, it is an acute infectious ophthalmia, which is caused by bacteria or viruses, it is a common external eye disease. This disease can occur throughout the year, and it is more common in spring and summer. Pink eye is a contagious eye disease, such as contact with towels, wash utensils, faucets, doorknobs, swimming pool water and so on, which are used by people with pink eye. So this disease does not have a relation with your age, adult can also get pink eyes.