One of the great things about riding in the summer are the long sunny days, and getting to enjoy the warmth. However, with the summer fun also come the bugs. And bugs tend to get in your eyes.
My current bike path takes me by some fields and the fields are generally FILLED with bugs and as I am riding past the fields, the bugs seem to always find their way into my eyes. If you have not had that pleasure, I can tell you it stings. On top of the stinging, it is a distraction and we want to avoid distractions especially when we are sharing the road with cars.
Therefore, in order to avoid bugs in the eyes, I recommend sunglasses. I like the kind that are fairly aerodynamic. They do the best at minimizing the probability of bugs still getting into your eyes. However, any type of sunglasses works, just get something that is comfortable and sturdy.
As soon as fall and winter come, my glasses strategy totally changes and I find riding sans glasses much better. I find that they fog up to easily, and are more of a hindrance than a help. Additionally, as the days grow shorter, I need as much light as possible to see the roads well.
Tell me what you think, good luck and have fun riding J