1. A method of selecting a stereoscopic pair of images, comprising the steps of: (a) selecting a first image; (b) aligning at least one cursor overlaid on the first image with at least one image feature of the first image; (c) shifting the or each cursor laterally by a predetermined amount; and (d) selecting a second image which contains the feature and in which the or each cursor is overlaid on the second image and is substantially aligned with the or each feature.