Download The Evolution of the Eye by Georg Glaeser, Hannes F. Paulus PDF

By Georg Glaeser, Hannes F. Paulus

With interesting, spectacularly appealing pictures, the publication piques readers’ interest concerning the variety of visible organs. This ebook is the results of a twin technique – clinical in addition to aesthetic. The compelling pictures are followed by means of an easy-to-read, comprehensible textual content, aimed toward either scientists and the trained public, and customarily a person drawn to the wonderful thing about nature. due to this mix, the ebook provides the remarkable variety of eyes within the animal state and gives numerous insights into the interesting mechanisms at paintings – from easy pigment cups to independently versatile, telescopic, side and lens eyes.

Educational, intriguing, pleasing until the final web page, it is a e-book for an individual who's attracted to evolution, nature and the miracle of life.

Show description

By Georg Glaeser, Hannes F. Paulus

With interesting, spectacularly appealing pictures, the publication piques readers’ interest concerning the variety of visible organs. This ebook is the results of a twin technique – clinical in addition to aesthetic. The compelling pictures are followed by means of an easy-to-read, comprehensible textual content, aimed toward either scientists and the trained public, and customarily a person drawn to the wonderful thing about nature. due to this mix, the ebook provides the remarkable variety of eyes within the animal state and gives numerous insights into the interesting mechanisms at paintings – from easy pigment cups to independently versatile, telescopic, side and lens eyes.

Educational, intriguing, pleasing until the final web page, it is a e-book for an individual who's attracted to evolution, nature and the miracle of life.

Show description

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Additional info for The Evolution of the Eye

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In part, this is accomplished by orienting the visual pigments in the separate eyes in different directions. This aids in the detection of contrast – an essential feature in underwater environments which are low on contrast to begin with. Mantis shrimp (Stomatopoda) 40 Facet eyes below the water The ancestors of contemporary arthropods originated in the ocean – and thus, it follows that facet eyes must first have evolved below the water. Many of these ancestors became extinct towards the end of the Permian – the then-omnipresent trilobites being among the species that disappeared.

Mexican dwarf orange crayfish (Cambarellus patzcuarensis sp. orange) K. Vogt The optical system of the crayfish eye (1980) J. comp. Physiol. 135: 1-19. crabs have evolved an even more clever way of seeing. In place of crystal cone lenses, they possess rectangular mirror optics, which direct incident light at the multilayer inner surfaces near the top of the rhabdom. These mirrors are positioned exactly perpendicular with respect to each other. The cornea lens is likewise rectangular, as opposed to the hexagonal design of regular facet eyes.

Crabs have evolved an even more clever way of seeing. In place of crystal cone lenses, they possess rectangular mirror optics, which direct incident light at the multilayer inner surfaces near the top of the rhabdom. These mirrors are positioned exactly perpendicular with respect to each other. The cornea lens is likewise rectangular, as opposed to the hexagonal design of regular facet eyes. With this system of mirror lenses, the animals are able to picture their surroundings with a high sensitivity to light and with a high resolution, even as their eyes stay relatively still.

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