1. Unique Iris: Just like fingerprints, no two irises are identical.

2. Blind Spot: Everyone has a blind spot in each eye, located where the optic nerve meets the retina.

3. Eye Movement: Eyes move 3-4 times per second, making them the fastest moving muscles.

4. Color Perception: Some people have Tetrachromacy, seeing 100 million colors due to extra cone cells.

5. Eye Shape: Almond-shaped eyes are most common, but others have round, hooded, or monolids.

6. Pupil Size: Pupils change size 50% when looking at something pleasing.

7. Eye Contact: Humans maintain eye contact 30-60% of conversation time