Sacred Eyes - Windows of the Soul
The Evil Eye
The image of the evil eye, which is typically blue in color is to deflect harm or evil intent.
Third Eye - AKA the brow chakra
The Brow Chakra is associated with the color indigo. It is also often referred to as the "third eye" or the "mind center." It is our avenue to wisdom - learning from our experiences and putting them in perspective.
The Eye in the Hand
This page has collected a large number of these interesting images. It also lists the meanings from various cultures.