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  The cornea as an optical element in the cetacean eye

Kröger, R., & Kirschfeld, K. (1992). The cornea as an optical element in the cetacean eye. In J. Thomas, R. Kastelein, & A. Supin (Eds.), Marine Mammal Sensory Systems (pp. 97-106). New York, NY, USA: Plenum Press.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0006-0480-4 Version Permalink: https://hdl.handle.net/21.11116/0000-0006-0481-3
Genre: Conference Paper

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https://link.springer.com/content/pdf/10.1007%2F978-1-4615-3406-8_5.pdf (Publisher version)
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 Creators:
Kröger, RHH1, 2, Author           
Kirschfeld, K1, 2, Author           
Affiliations:
1Former Department Comparative Neurobiology, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497800              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: In the human eye about two-thirds of the total refractive power resides in the cornea. The large difference in the refractive index between air (1.0) and corneal tissue (ca. 1.38) makes the anterior corneal surface the principal refracting element, although the curvatures of the surfaces of the crystalline lens are stronger. This is due to the fact that the lens is immersed in aqueous humor (n = 1.33) which is not very different in refractive index from the surface of the lens (n = 1.36). If a diver submerges in water, the effect of the cornea is almost completely cancelled since the refractive index of water (ca. 1.33) is about the same as the index of the cornea. Humans are therefore extremely hyperopic (farsighted) under water. The refractive power of the lens alone, even if fully accommodated, is insufficient to focus light on the retina. Humans have to wear a mask that reinstates an air-cornea interface in order to see well in water.

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 Dates: 1992
 Publication Status: Issued
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.1007/978-1-4615-3406-8_5
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Title: Symposium on Sensory Systems of Aquatic Mammals 1991
Place of Event: Moskva, Russian Federation
Start-/End Date: 1991-10-16 - 1991-10-19

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Title: Marine Mammal Sensory Systems
Source Genre: Proceedings
 Creator(s):
Thomas, JA, Editor
Kastelein, RA, Editor
Supin, AY, Editor
Affiliations:
-
Publ. Info: New York, NY, USA : Plenum Press
Pages: 773 Volume / Issue: - Sequence Number: - Start / End Page: 97 - 106 Identifier: ISBN: 0-306-44351-1