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Matthiessen's ratio

Type of optic ratio From Wikipedia, the free encyclopedia

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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]

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