I believe the eye detects photon energy, not EM fields. If you don't like photons, then the eye responds to the average energy deposited by the EM fields. Don't forget that in the visible range these fields change direction about 1014 times a second. Did you come across this article when you searched? https://en.wikipedia.org/wiki/Photoreceptor_cell
Thanks for the quantum and wikipedia comments. Since I didn't use the word photoreceptor I wasn't successful. I guess I was too Maxwellian. That wiki article is fascinating along with the great illustrations. Now I can really appreciate my vision.