A device for vision testing comprises a viewing position (6) and an image surface (5). The distance between the viewing position (6) and the image surface (5) is enclosed. The relation between the resolution of the image surface and the distance between the viewing position (6) and the image surface...http://www.google.fr/patents/US8061839?utm_source=gb-gplus-shareBrevet US8061839 - Device and method for vision test
