Well, yes, tea tree oil can do a good job to itchy eyes, for it contains a cosmetic product. And then, it will help itchy eyes. Besides, advance formulation of tea tree oil also contains purcelin oil and is also effective too. Also, itchy eyes can be caused by many factors, such as the allergies, and the infection. So you can just have some tea tree oil to treat it. By the way, you can try an over-the-counter eye drop. According to some experts, adding omega-3 fatty acids to your diet either in supplement form or in foods like walnuts, salmon is also good. So just have a try.