User blog comment:Monstermaster13/New Fanmade Wesens/@comment-5914541-20130220225541

Another comment, a tuatara's third eye is neither functional nor a real eye. It is known as the parietal eye and its nerve that would connect it to the brain is degenerate. The parietal eye is only visible in hatchlings and becomes covered in scales as the tuatara matures. Although, it probably did evolve from a real eye.