Through the eyes you can find out the emotional state of a person, mood, thoughts. If you carefully monitor the direction of your gaze, the size of the pupils, there is an opportunity to know in advance where the conversation vector will be directed.
An attentive interlocutor will be able to determine his mood by the eyes of a partner, even read his thoughts. But for this you need to be not only observant, but also show empathy.
Pupil size
When a conversation is being held, the interlocutors meet with glances, look at each other. If the conversation partner often avoids looking into the eyes, either he is not interested in continuing the topic, or is hiding something.
A squint is often used to convey interest. In most cases, it is accompanied by a slight squint and raising eyebrows. But if there is anger in the eyes, this is a sign of hostility or suspicion.
Well, if the conversation is conducted in daylight. Then you can observe the pupils. They fully convey the mood of a person. If the interlocutor is in a good mood, the pupils dilate four times. With a decrease in mood, they decrease to "beads."