There are many creatures with vestigial eyes.
http://en.wikipedia.org/wiki/Blind_Mole
The mole rat lived underground like the mole, so they do not need eyes at all. They have small eyes that are covered by skin making them blind.
http://en.wikipedia.org/wiki/Blind_Mole
The blind mole also lives underground and has its eyes covered by skin making it blind.
http://en.wikipedia.org/wiki/Olm
The Olm is a blind amphibian that lives in deep dark caves underwater and has eyes that are under-developed and are covered by skin. It is a close relative to salamanders.
http://en.wikipedia.org/wiki/Grotto_Salamander
The Grotto salamander is a blind salamander. The blind salamanders have eyes with retinas and lenses, yet the eyelids grow over the eye, sealing them from outside light. They are also closely related to other salamanders.
http://www.tpwd.state.tx.us/huntwild/wild/species/blindsal/
The Texas blind salamander has no eyes only two black dots. It has eye sockets but no eyes.
http://en.wikipedia.org/wiki/Mexican_tetra
The blind cave Mexican tetra is also blind. When they are born, they have eyes, but as they grow older skin grows over them and their eyes degenerate, because there is no need for sight in the waters of a pitch-black cave. The eyes of the blind Mexican tetra has a lens, a degenerate retina, a degenerate optic nerve, and a sclera, even though the tetra cannot see.
It is a close relative of the Mexican Tetra which can see.
All this makes perfect sense in light of evolution. These species adapted to live in the dark and so did not need their eyes any more. Many of them lost their eyes, have degenerate eyes, and/or have their eyes covered up by skin. Since the eyes are useless in the dark, mutations that destroyed the eye function would not be selected against by natural selection.
Since these eyes are disease-prone exposed fleshy patches on the face, they were covered by skin to protect them. And that is why they look so similar to close relatives with eyes (e.g. Mexican Tetra). The ancestors of the blind Mexican tetra were related to the ancestor of the Tetra but evolved to lose their eyes. The same goes for the blind salamanders, and blind moles.
According to creationists, this would have to be an instance of speciation since these species did lose their eyes to evolution and developed independent species. This would be to admit that significant evolution is possible.
If creationists try to contend that God make them eyeless, the question is why? Why would God give them eyes at all if these eyes are never going to be used? Why make these creatures look as if they evolved to be eyeless? Is God trying to trick us?
This is evidence of evolution.
