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adipose eyelid
An adipose eyelid is a transparent eyelid found in fish, that covers some or all of the eye.〔(【引用サイトリンク】title=Teleost Anatomy Ontology: Adipose eyelid )〕〔(【引用サイトリンク】title=Smithsonian Tropical Research Institute - Shorefishes of the Tropical Eastern Pacific )〕 They are most commonly found on deep sea (benthic) fish, but can also be seen on non-benthic fish. Some fish that this feature is found on include: milkfish, herring-like isospondyls, jacks, mullets, and mackerel. The overall anatomy of the eyelids plays an important role in understanding their possible purpose.
==Purpose==
Though the true purpose of these bodily structures is not known, it is generally accepted that the eyelids play some role in affecting the vision of the fish or otherwise serving to protect the fish. There are four proposed theories. The first is that the eyelids may act as a lens, increasing the fish's ability to focus on specific objects and interpreting its surroundings better.〔 The second is providing the fish the capability of seeing polarized light. The third theory is that it may block out ultraviolet light, and finally, the fourth theory is the eyelids serve as a physical barrier against foreign objects in the waters.〔 Scientists are still unsure of the biological implications for the second theory. The first theory is more practical because of the presence of this feature on deep sea fish. This ability to see better is crucial for their survival as visibility is severely reduced in the deeper parts of the ocean. The opposite however can be said for the non-benthic fish because there is more light near the surface of the ocean, so there would not necessarily be a need for a stronger sense of sight.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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