1. A method for in vivo imaging of corneal tissue, comprising the steps: (a) providing a laser beam having a substantially planar configuration; (b) directing said laser beam through a cross-sectional portion of said corneal tissue, so as to illuminate said cross-sectional portion and cause said laser beam to be scattered by molecules in said corneal tissue; and (c) detecting at least a portion of said scattered laser light so as to form a cross-sectional image of said corneal tissue.