1. An optical imaging apparatus for obtaining depth profile information from a transparent object, comprising: a spectral optical coherence tomography (OCT) apparatus for generating a sample beam for transversely scanning said object; a dual port coupler for combining the sample beam returned from the object with a reference beam to produce respective output beams at a pair of output ports; a spectrometer coupled to one of said output ports for producing spectral OCT data from light from said sample beam returned from said object along at least one line extending in a longitudinal direction; a confocal detector coupled to the other of said output ports for producing an en-face image of the object in a transverse plane from said light from said sample beam returned from said object; a processing unit generating OCT image data along said at least one line from said spectral OCT data; said processing unit being configured to display said en-face image; a selection device for selecting a point or line on said en-face image; and said processing unit being configured to display a portion of said OCT image data corresponding to said point or line of said en-face image.