In case that any chemical products enter your eyes, the first and the most important thing to do is rinse your eyes with cold running water through. Based on different ingredients, bug spray can be either acidic or alkaline. Both of the ingredients will undertake chemical reaction. Different reactions arouse different result which may do harms to eyes. As chemical substances are not easy to react in low temperature, thus cold water shall be used to reduce the burning. Running water could take the substance adhering to eyes so that more damage could be avoided. After rinsing your eyes for about 10 to 15 minutes, if you are not sure about the ingredient of bug spray, do not use eye-drops rashly. Go to the doctor for professional guidance.