There is a bendable optical sensor:

http://spectrum.ieee.org/tech-talk/semiconductors/devices/sony-creates-curved-cmos-sensors-that-mimic-the-eye

Regards,

Joachim

You can legitimately use a camera as an eye surrogate for testing real/virtual registration in AR.  You will, however, have to model the position of the camera in the same manner you would have to model the position of the eye.  Keep in mind that in optical-see-through AR the combination of real and virtual elements happens (optically) before the light reaches the eye, so if the optical center of the camera is known and is placed in a reasonable eye position, the camera's view of the AR scene should be roughly equivalent to that of forward-looking eye in the same position.  I'm going to try to attach some photos of a setup I did years ago for calibrating real/virtual registration in an OST-AR display.  I hope this is helpful.