The find also indicated that advanced arthropod eyes able to "tell friend or foe and detect features of the environment" had evolved very early, before the evolution of jointed legs or hardened exoskeletons. The eyes were 30 times as powerful as those of trilobites, long thought to have had the most advanced eyes of any contemporary species. With 30,000 lenses, the resolution of the 3 centimetres (1.2 in) wide eyes would have been rivalled only by that of the modern dragonfly, which has 28,000 lenses in each eye.[12][13][14]