Spiders have 8 eyes, so he has 8 lenses, for cosmetic reasons only. He is still human under the mask. Also, he wears Vibram shoes, as they provide better grip when climbing.
I love the eight extra lenses, it's a very nice touch. It definitely has a bit of an Amazing Spider-Man vibe going to it, it looks a lot like the film costume, which is the only thing I liked about the movie!