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Scheimpflug photograph of a 51 year-old lens with the boundaries of the Zones of Optical Discontinuity outlined. Zones which appear light in the figure are those which scatter light back to the observer while the dark zones are more transparent. The modified Vogt and Oxford nomenclatures for the various zones are shown. A scale is included to allow assessment of the sizes of the features. The slit lamp photograph was kindly supplied by Dr M Dubbelman.
