Yes, dehydration can cause yellow eyes. First, you should know that dehydration has many symptoms: muscle cramps, nausea, heart palpitations, and lightheadedness. Also, the eyes can stop making tears in extreme cases. So that it could cause the eyes to dry out. In some cases, it will become bloodshot eyes. Of course, yellow eyes are also possible. In this situation, first, you should keep drinking more water. Also, there is an effective way which you can have a try. 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.