Yes, of course you can. It has been proved safe by many pioneers like Galileo. If it had been bad for eyes, Galileo would have been blind or developed eye problems. As a matter of fact, he became the first human to look at the moon through telescope and watched the universe.
Suggestions:
If you want to watch the moon clearly enough, you may need 20 times of Magnification telescope. You can see the details of crater on the moon slightly.The best magnification will be 40 times, as details are clearly showed and it won't be affected by the air.