If two people make eye contact and someone points at something (without speaking) with only their eyes,
Usually we say that the person who is "pointing" with his/her eyes is signaling in that direction (with his/her eyes). For example, "He signaled with his eyes that there were guards standing in the corner".
Other phrases that you could use are, for example:
1. He indicated that ...
2. He gazed to the left to show that ...
Feel free to use any other synonyms that are similar to "signal" or "indicate".
You might also dart a glance at someone or something, meaning that you would look at the subject for a very short time (Macmillan).