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The lens of the eye is no optical homogenous medium. There is a gradient of optical density falling from higher values in the centre to lower values in the periphery. With multiray-interferometry the resulting isoindicial curves ofGullstrand could be demonstrated for the first time on thin sections of the lens. There are still difficulties in the preparation of the slices to overcome as they must be neither deformed nor denaturated. If they are solved, the lens may be measured much more accurately with this method than with the formerly used refractometer ofAbbe .