It could be an infection or something caused by the glass shattering. Did/do you have the bulb inside the cage??

Also, the pads on its head don't look as full as they should...could be not enough water or not enough fat stores.
See how these ones protrude more?...
http://www.chameleonsonly.com/Pictures/Glorfindel's Son - 5 mo. old in our colony.JPG
http://www.fotosearch.com/CRT150/15304-55fl/
http://www.fotosearch.com/CSP098/k0981918/