In an eye field tester, a vidicon camera observes the eye being tested and relays the resultant low light level image to the periphery of a digital display. The digital display contains both an image of the eye on the periphery and the plot of the visual field of the eye under test in the center. The...http://www.google.fr/patents/US4739410?utm_source=gb-gplus-shareBrevet US4739410 - Superimposed analog video image on plotted digital field tester display
Superimposed analog video image on plotted digital field tester display
