Matthiessen's ratio

Type of optic ratio

In optics, Matthiessen's ratio is the ratio between the distance from the centre of the lens to the retina, versus the lens radius.^[1]

This is of particular importance in fish, where the value may decrease from as high as 3.6 to 2.3,^[1] decreasing the focal ratio of the lens. A higher focal ratio is thought to compensate for the relatively high Matthiessen's ratio brought about by constraints of small eye size during early development. This provides a means for larval fish to focus images from different distances, before the ability to accommodate is gained.^[1]

See also

Digital Fish Library
Fish development
Operculum papillare
Photophore
Sensory systems in fish
Stylophthalmine trait
Vision in fish
Visual perception

References

^ ^a ^b ^c Shand, J.; K. B Døving; S. P Collin (1999). "Optics of the developing fish eye: comparisons of Matthiessen's ratio and the focal length of the lens in the black bream Acanthopagrus butcheri (Sparidae, Teleostei)". Vision Research. 39 (6): 1071–1078. doi:10.1016/S0042-6989(98)00215-6. ISSN 0042-6989. PMID 10343827. S2CID 8525655.

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