A Ganzfeld contact lens electrode.
A small piece of Ping-Pong ball material fitted to a Burian-Allen contact lens electrode provided a large field of evenly distributed light on the retina that resulted in larger electroretinographic amplitudes and more accurate measurement of b-wave latencies.
D003261:Contact Lenses; D004058:Diffusion; D004566:Electrodes; D004596:Electroretinography / Q000295:instrumentation*; D006801:Humans; D008029:Lighting / Q000379:methods; D011187:Posture