Visual Optics: Remarkable Image-Forming Mirrors in Scallop Eyes Eric J. Warrant  Current Biology  Volume 28, Issue 6, Pages R262-R264 (March 2018) DOI: 10.1016/j.cub.2018.01.079 Copyright © 2018 Elsevier Ltd Terms and Conditions

Figure 1 The concave mirror eyes of scallops. (A) A living scallop (Pecten maximus) with several eyes visible (yellow arrow). Photo: Ceri Jones, Haven Diving Services, with permission. (B) Eyes along the mantle edges of an unknown species of scallop. Photograph courtesy of the photographer Matthew Krummins (via a Creative Commons Attribution 2.0 Generic License). (C) The mosaic of square guanine crystals tiling the mirror. (D). The thickness of the mirror seen in cross-section, showing its many layers of guanine crystals. Scale bars in (C,D): 1 μm. Images in (C,D) courtesy of Benjamin Palmer. Current Biology 2018 28, R262-R264DOI: (10.1016/j.cub.2018.01.079) Copyright © 2018 Elsevier Ltd Terms and Conditions

Figure 2 The concave mirror eye of the scallop Pecten. (A) Light rays are weakly refracted by a gelatinous lens (l ) and are reflected by a nearly spherical concave mirror (m) lining the back of the eye. This mirror creates a focused image in a retina (r) suspended above the mirror. Image courtesy of Dan-Eric Nilsson. Current Biology 2018 28, R262-R264DOI: (10.1016/j.cub.2018.01.079) Copyright © 2018 Elsevier Ltd Terms and Conditions