10 December 2001 Formerly novel optics: a collection of optical tidbits
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Thefirst birefringent optical element was the calcite trilobite eye, 540,000,000 years ago. One type was a hexagonal array of from one to several thousand lenslets of calcite crystals, oriented to produce no double images. At each molt new eyes were grown. Some trilobite eyes were calcite with spherical aberration correction resulting from a gradient index. (Some trilobites were blind.) Reference: Richard Fortey, Trilobite!, Knoff, New York, 2000
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Douglas S. Goodman, "Formerly novel optics: a collection of optical tidbits", Proc. SPIE 4442, Novel Optical Systems Design and Optimization IV, (10 December 2001); doi: 10.1117/12.449963; https://doi.org/10.1117/12.449963

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