Well, generally speaking, constipation is a symptom of a poorly functioning digestive system. And according to some experts, when it occurs, there will be some other symptoms occurring in your body. For example, lack of energy, bad breath can be possible. Also, it will just affect your eyes, leading to some eye problems, such as dark circles under the eyes. And in some cases, yellow eyes can be possible too. So I have to say that it is kind of normal for you to have yellowing in your eyes. And for your situation, you can drink more water, for increasing the amount of water we drink will reduce the risk of the stool becoming too dry. And that can just relieve yellow eyes.