Emission of the photons with the highest energy produces gamma rays, and you would not want to get any of those in your eye. I don't know what color sensation they might produce, if any, but it could be the last color sensation you would ever experience with that eye.
WITHIN the range of wavelengths/frequencies perceptible to the human visual system, the highest-energy photons are the ones associated with the last color you can see on the VIOLET end of the rainbow.
