A fibrous membrane suspends the multifocal lens in the eyes of lampreys and African lungfishes

Journal of Morphology
Ola S E GustafssonRonald H H Kröger

Abstract

The sharpness and thus information content of the retinal image in the eye depends on the optical quality of the lens and its accurate positioning in the eye. Multifocal lenses create well-focused color images and are present in the eyes of all vertebrate groups studied to date (mammals, reptiles including birds, amphibians, and ray-finned fishes) and occur even in lampreys, i.e., the most basal vertebrates with well-developed eyes. Results from photoretinoscopy obtained in this study indicate that the Dipnoi (lungfishes), i.e., the closest piscine relatives to tetrapods, also possess multifocal lenses. Suspension of the lens is complex and sophisticated in teleosts (bony fishes) and tetrapods. We studied lens suspension using light and electron microscopy in one species of lamprey (Lampetra fluviatilis) and two species of African lungfish (Protopterus aethiopicus aethiopicus and Protopterus annectens annectens). A fibrous and highly transparent membrane suspends the lens in both of these phylogenetically widely separated vertebrate groups. The membrane attaches to the lens approximately along the lens equator, from where it extends to the ora retinalis. The material forming the membrane is similar in ultrastructure to microfib...Continue Reading

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Citations

Apr 3, 2012·Journal of Morphology·Ola S E GustafssonRonald H H Kröger
Apr 14, 2012·Journal of Fish Biology·T J LisneyN S Hart
Dec 11, 2013·Journal of Morphology·Ronald H H KrögerInga Tuminaite
Dec 25, 2012·Progress in Retinal and Eye Research·Ronald H H Kröger
Oct 12, 2012·Proceedings. Biological Sciences·Minoru UchiyamaJean M P Joss
Oct 15, 2019·The FEBS Journal·Julia LüdemannThorsten Burmester
Feb 11, 2015·FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology·François ChauvignéRoderick Nigel Finn

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