When I was in the 6th grade we read about a novel about a boy living on Earth, but humans were ruled over by tripods and I think all technology had been abandoned because I remember that the main character was surprised to see another person wearing glasses.

Also at one point in the novel, the protagonist finds himself in a knight's castle and such.

This is pretty much the extent I remember of the novel. Any guesses? I wish I could remember...

Is this what you mean: The Tripods by John Christopher (http://www.gnelson.demon.co.uk/Tripods.html)

There's a shed load of info on this Here (http://www.google.co.uk/search?hl=en&hs=x15&lr=&client=firefox-a&rls=org.mozilla:en-US:official&q=related:www.gnelson.demon.co.uk/Tripods.html)

Yep that'd be it!

Actually after I made this post, I thought to myself, "Why not try googling 'tripods'?" So I did and actually found it... so really I wasted your time and felt stupid in having made this post.

Sorry!