"Eye of the Butterfly"

Eye of the Butterfly
Nikon 55mm f/2.8 AI-S Macro @ f/4 | 1/320s | ISO 250

I believe this is a "Common Buckeye" (Junonia coenia.) Anyone know for sure?
Taken at The Tropical Butterfly House in the Pacific Science Center in Seattle, WA.

This Nikon lens, by the way, I'd heavily recommend. It's less than $200 and it's really really sharp. So sharp it's dangerous. Only wish it was higher focal length at times, but an APS-C sensor you get around an 80mm field of view, so that helps a bit!