Well, of course, yes, hayfever can lead to eye infection. As we know that when you have a cold which is caused by the virus, it is possible to have hay fever. in that way, your eye immune system can be weak, and then the virus will invade into your eyes, leading to eye infection. And at this moment, your eyes will turn to red and bloodshot, in some degree, it can be itchy too. To treat your bloodshot eyes, you should take some measures to heal your high fever. For example, you can drink hot beverages. According to some studies, a hot drink provides immediate and lasting relief of cold symptoms such as runny nose, cough, sneezing, and sore throat. And also, you should eat a diet rich in fresh fruits and vegetables. You should know that these foods provide lots of antioxidants, which may help boost your immune system, especially vitamins A and C. in this way, I think it can do a help to your eyes.