The pilot of a Cessna TR182 stated that he became momentarily distracted by the sun while on final approach, which resulted in a fast approach. After landing he realized he was unable to stop on the runway, and applied power to go-around, but was too late. While on the ground, the airplane traveled off the departure end of the runway, down a hill, and came to rest in a cornfield. The pilot did not report any mechanical failures or malfunctions to the airplane or any of its systems prior to the accident.