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This is of particular importance in fish, where the value may decrease from as high as 3.6 to 2.3, 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.
- 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.
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