Geometrical optics of a galatheid compound eye

Gaten, E.

doi:10.1007/bf00191846

Cited by 12 publications

(16 citation statements)

References 47 publications

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“…Some eyes were dissected and whole crystalline cones were removed for observation using an interference microscope (Zeiss, Jamin‐Lebedeff) in order to demonstrate the refractive index profile within the crystalline cone (see Gaten 1994).…”

Section: Methodsmentioning

confidence: 99%

Eye morphology and optics of the double‐eyed mysid Euchaetomera typica

2002

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 AbstractGaten, E., Herring, P. J. and Shelton, P. M. J. 2002. Eye morphology and optics of the double-eyed mysid Euchaetomera typica . -Acta Zoologica (Stockholm) 83 : 221-230The structure and optics of the mesopelagic double-eyed mysid crustacean Euchaetomera typica Sars, 1884 are described for the first time. The lateral eye is a typical refracting superposition eye with a wide field of view (172 ° ) and low resolution (interommatidial angle of 7.3 ° ). The antero-dorsal part of the eye is elongated due to the extension of the clear zone. This dorsal eye has a restricted field of view (33 ° ) but much higher resolution (1.5 ° ). The dorsal eye also uses refracting superposition optics, although the optical array is unusual as many of the peripheral ommatidia lack crystalline cones. The centre of curvature of the cornea is in front of the flattened rhabdom layer whereas the axes of the crystalline cones are centred on a point about twice as deep as the rhabdom layer. This results in a well-focused eye, free of spherical aberration. There is a remarkable similarity in eye structure between this species and some mesopelagic double-eyed euphausiid crustaceans.

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Section: Methodsmentioning

confidence: 99%

Eye morphology and optics of the double‐eyed mysid Euchaetomera typica

2002

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“…The eye is atypical among decapods with superposition optics in its lack of spherical symmetry, the distinctive kidney shaped eye being oval when viewed from the lateral aspect. However, this region uses apposition optics and more likely has a special function in relation to viewing the brighter downwelling light (Gaten, 1994;Tokarski and Hafner, 1984). The corneal facets are square except for a small region close to the dorsal margin of the eye where the facets are hexagonal.…”

Section: Eye Structurementioning

confidence: 99%

“…The distribution of bright eyeshine thus appears to coincide with the regions of both greatest interest and least light. Rhabdoms and fragments of cornea were isolated from lightly fixed eyes and the RI measured using the technique described in Gaten (1994) .10 Photographs of eyeshine in an isolated, dark-adapted Nephrops eye, at 45 intervals from dorsal to ventral (D to V) and from anterior to posterior (A to P). Determining the path of light within the eye requires knowledge of the refractive indices (RIs) of the active optical components of the eye.…”

Section: Opticsmentioning

confidence: 99%

The Reniform Reflecting Superposition Compound Eyes of Nephrops norvegicus

Gaten¹,

Moss²,

Johnson³

2013

Advances in Marine Biology

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The large reniform eyes of the reptant, tube-dwelling decapod Nephrops norvegicus are described in detail. Optically these reflecting superposition compound eyes are a little unusual in that they are laterally flattened, a feature that may enhance their sensitivity in that region, albeit at the expense of resolution. Electrophysiological and anatomical investigations suggest that the eyes are tuned to appropriate spectral and temporal sensitivities in the long and short term through movement of proximal pigments and possibly rhabdom adaptation. Although exposure to ambient surface light intensities is shown to cause damage to the retinal layer, especially in deeper living animals, there is no evidence yet that demonstrates an impact of eye damage on their survival. It is suggested that experimentation on marine decapods, with sensitive eyes, requires that particular attention is paid to their light environment.

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“…In this situation, a narrow aperture would result in the greatest change in the response of the ommatidium, from a maximum (the unattenuated downwelling light) to a minimum (the silhouette of the object). The retention of apposition optics in the dorsal part of the eye thus makes optical sense (Gaten, 1994).…”

Section: Development Of Superposition Opticsmentioning

confidence: 99%

Morphology of the reflecting superposition eyes of larval oplophorid shrimps

Gaten

Herring

1995

Journal of Morphology

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The eyes of larval and juvenile oplophorid shrimps are described for the first time. Variations in eye development occur depending on whether the zoeal stages are lecithotrophic or planktotrophic. In those genera where the first free-living stage is planktonic, the eyes are of the transparent apposition type seen in other decapod zoeas. However, where the eggs hatch after completion of the lecithotrophic zoeal stages, the eyes are laready developing the superposition optics found in the adult. In Oplophorus spinosus the changeover from hexagonal to square facets, indicative of superposition optics, proceeds from anterior to posterior. In Systellaspis debilis the square facets appear first on the lateral face of the eye. Eventually, in both species, only the most dorsal ommatidia retain apposition optics. © 1995 Wiley-Liss, Inc.

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Geometrical optics of a galatheid compound eye

Cited by 12 publications

References 47 publications

Eye morphology and optics of the double‐eyed mysid Euchaetomera typica

Eye morphology and optics of the double‐eyed mysid Euchaetomera typica

The Reniform Reflecting Superposition Compound Eyes of Nephrops norvegicus

Morphology of the reflecting superposition eyes of larval oplophorid shrimps

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