1. A method for propagating modifications to a segmentation of optical coherence tomography (OCT) volume data comprising: a. acquiring OCT volume data; b. initially segmenting the data to identify a surface within the OCT volume; c. displaying a first slice of the OCT volume data which includes at least a portion of the surface defined by the initial segmentation; d. accepting user modifications of the surface at one or more points with respect to the displayed first slice, said user modifications overriding the initial segmentation; e. automatically modifying additional portions of the initial segmentation over a propagation zone containing additional portions of the volume data based on the user modifications to the first slice thereby providing a more accurate overall segmentation; f. displaying or storing the results of the modified segmentation or a further analysis thereof.