Gnats
In the mountains of Pennsylvania the most troublesome insects I found were the tiny gnats that persist in flying into one's eyes in a very exasperating fashion. They swarm in a cloud in front of your face as you walk and make constant dashes at your eyes, although to reach their goal brings instant death.
It is not much trouble to get one of these gnats out of your eye when it once gets in. All that is necessary is to take the eyelashes of the upper eyelid between your thumb and first finger, and draw the upper eyelid down over the under eyelid. The under eyelashes sweep the upper lid clear, and the rush of tears that comes to the eye washes the insect out.