1. An apparatus for measuring the eye comprising: an optical coherence tomography (OCT) system having a radiation beam which is scanned over the eye; a line-scan ophthalmoscope (LSO) for generating an image of the eye by scanning a line of light across the eye; and a processor for controlling the OCT and LSO, said processor for capturing image data from the LSO corresponding to a position of the line of light on the eye and comparing the image data to a reference image to determine if the eye has moved and using that information to correct the positioning of the radiation beam used by the OCT.