Teasel in the sun

I nearly burned my eyeball out taking this shot. It was a bit windy and the Teasel kept moving out of the way of the sun which burned out my eyeball. I'm assuming the lens didn't help at all.

Model: Canon EOS DIGITAL REBEL XT

Lens: Canon 24-105mm f/4L
ISO: 200
Exposure: 1/640 sec
Aperture: 4.0
Focal Length: 105mm
Flash Used: No