Known popularly as the "windows of the soul," the eyes are used a lot in tattoo themes because they are something deep and very particular to each person, since each human being expresses himself in a unique way.
The eye, as a symbol, appears in various cultures around the world with varied meanings. Here are some examples:
Eagle Eyes ? Clarity, bravery, vision, focus, overcoming obstacles, resilience
Greek Eye ? remove evil, remove envy and evil eye
Crying Eyes ? Memory of a loved one, imprisonment for murder
Alice in Wonderland ? The eyes of the Cheshire cat are fluorescent, hypnotic, frightening and enigmatic
Gatsby's Eyes ? Image from the book "The Great Gatsby", symbolizes God's ever-watchful eyes and the death of the American dream
Third Eye ? Religious symbol, spiritual eye, eye of the soul, intuition, ability to foresee the future, enlightenment
Eye of Providence ? Eye of God, ?Father, Son and the Holy Spirit?
Tiger Eye ? strength, will to survive, focus, patience, instinct
Eye of Horus ? Protection, surveillance
Realistic Eyes ? spirituality, clairvoyance, human soul
Meaning of Eye Tattoo:
- Mystery
- Occultism
- Ancient Wisdom
- Puzzle
- Window of the Soul
- Murder
- Death
- Spirituality
- Surveillance
- Protection
- Focus
- Eye of God
- Lighting
- Warding off evil
- Memory
Here are some images of Eye tattoos:
English 
Portuguese 
German 
French 
Spanish 
Polish