Why the eyes?
For now, Luke wasn't quite sure either.
It was like how he couldn't explain the unusual change in his eyes after the increase in his Mental Strength.
However, most hypnosis techniques had to do with sight and hearing.
These were the easiest means by which human beings received information and perceived the outside world.
That was probably why Mental Communication could be activated via the eyes.
Later, Luke might try activating Mental Communication with words, or a combination of words and eyes; both were possibilities.
While he was mulling over the ability he had just acquired, Selina suddenly said, "It's here."
Almost at the same time, Luke focused his attention on Kris. Her breathing and heartrate had suddenly sped up.
Luke sighed inwardly with relief.