The Eye of Horus was used as a protective amulet and believed to have healing power. According to Egyptian Mythology Horus lost his left eye in his war with Set who tore the eye into six pieces.
These six pieces correspond to the six senses - Touch, Taste, Hearing, Thought, Sight, Smell. The eye is the receptor of input and it has these six doors, to receive data.
The construction of the eye follows very precise laws. The senses are ordered according to their importance.
Thoth, the g-d of wisdom and magic was able to reassemble the eye and returned it to Horus. Horus gave the reassembled eye to his murdered father Osiris, thereby bringing him back to life. The symbol therefore represents the power of healing and was capable of bringing the dead to life, as it did with Osiris. The ancient Egyptians used the eye as a funerary amulet for protection against evil and to guide their rebirth in the underworld.