herons and bitterns

• Encyclopedia of Life (original) (raw)

2008 California Academy of Sciences cc-by-nc-sa-3.0

• number of public records in bold
• corneal eyes
  • URI: https://eol.org/schema/terms/corneal_eyes
  • Definition: Because of the difference in refractive index between air and water (or corneal tissue), a curved cornea is an image-forming lens in its own right. Its focal length is determined by the radius of curvature of the cornea. Many corneal eyes (eg: in land vertebrates) also have lenses, but the lens is flattened and weakened compared with an aquatic lens; most of the refractive power is provided by the cornea. Corneal eyes cannot focus in aquatic habitat.
  • Attribution: https://www.britannica.com/science/photoreception/Single-chambered-eyes#ref278820
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