 Next example, we'll be showing the dilation lag typical of a Horner's syndrome. The lights are now turned off and you can see the right pupil dilates quite fast relative to the left. Normal pupil should dilate in about five seconds. Sympathetic defect in the left eye, you can see that it takes quite a bit longer for that pupil to overcome its defect. Another example, lights on, lights off. Notice how that right pupil springs to life and that left pupil just sort of lags behind. It takes about 10, 15 seconds to catch up. That's a nice way to document a Horner's syndrome. Here it is, lights are on. Now with the lights off, see that right pupil just spring to life and slowly that left pupil will catch up. You can also document this by taking still photographs. For example, in darkness, take a photograph at five seconds and 15 seconds and compare the degree of anisecoria. Here's another example. You can see how that left pupil just sort of springs right up. The right pupil takes a while to catch up. Lights back on. Notice how the noise adds to the sympathetic drive and accentuates the initial anisecoria. Here's both eyes in light and I'll turn one in the center of the tooth.