well, yes, yellow eyes can be a sign of dehydration. we can say that dehydration can cause yellow eyes. First, you should know that dehydration has many symptoms, such as muscle cramps, nausea, heart palpitations, and lightheadedness. When you have dehydration, your eyes will stop making tears in extreme cases. In other words, it could cause the eyes to dry out. Of course, yellow eyes are also possible. To treat it, you should keep drinking more water. Also, you can mix water, orange juice, sugar, salt, and tea water together, and then drink them for a time. That can be very beneficial for your symptom. anyway, you can have a try.