Yes, acid reflux can certainly cause eye pain. When we have acid reflux, we will relocate the stomach contents, I mean, food or liquid, from the stomach to our esophagus. As a result, it gives rise to tiny PH levels changes in our body and leads to body dehydration. The health harzards of dehydration of our body have been emphasized everywhere. Multiple but common symptoms are eye dryness and eye pain as our eyes have highly connected to our body and signal our body's more serious diseases. We need to take in enough liquid to guarantee our normal activities by drinking a certain amount of water. Besides, the vomiting and diarrhea can worse the condition. Well, you need to fix your acid reflux in order to relieve the eye pain thoroughly. Going to your local Eye Medical Department and asking for some medications can help immensely.