A plate from Johannes Kepler's Ad Vitellionem Paralipomena, quibus Astronomiae Pars Optica (1604), illustrating the structure of eyes. Source: http://www
Rudolphinischen Tafeln (Tabulae Rudolphinae: quibus astronomicae ...) von Johannes Kepler (1571–1630), aus der National Oceanic & Atmospheric Administration (NOAA)