Yes, the ultraviolet light in the sun light is very harmful to the eyes. A long time of exposure to the sun can do damage to the cornea, the conjunctiva, the retina, and the crystalline lens.Your eyes get red after exposure to the sun may be caused by the harm of the ultraviolet light in the sunshine to your conjunctiva. And the harm is accumulated as well as permanent. The ultraviolet light can cause the degeneration of the the conjunctiva, which can leads to palpebral fissure. The ultraviolet light can also increase the speed of the crystalline lens muddy, which will lead to cataracts. And ultraviolet light can affect the retina and lead to the macular degeneration. Therefore, you should do good sunscreen of your eyes when you are outside in the sun. First of all, wear a pair of sunglasses of which the colors of dark brown and deep green are the best. If you are interested in the sunglasses, you can refer to the following website for further information.