We would highly recommend that you get yourself a good quality pair of cycling sunglasses. They are invaluable at protecting your eyes from the glare from the sun and any airborne objects such as dust and flying insects. A friend of mine narrowly missed losing an eye when a Bumble Bee at high speed hit him!
Look for the ones that are the wrap around style to give the best protection and those which have 3 interchangeable lenses, one blue smoked for low light, one yellow for dull days and one dark for sunny days.
They are easily scratched so make a habit of putting them back in their protective case when they are not being worn.