I came across an article in Austin Woman a few months back that discussed the importance of protecting your eyes from UV rays.
As explained by Ophthalmologist Dr. Zarmeena Vendal, UV rays can have damaging affects on our eyes, and can cause macular degeneration, cataracts, pterygium (also known as Surfer's Eye) and solar retinopathy.
To protect our eyes, Dr. Vandal suggests sunglasses that offers 100% UVA, UVB, and UVC protection. She also suggests looking for sunglasses that prevents the most light, "from getting to the eyes from around the frame."
You can read the Q&A article and early warning signs of skin cancer on the eyelids HERE.
Source: http://www.austinwomanmagazine.com/easy-on-the-eyes; http://www.skincancer.org/prevention/uva-and-uvb