Device for measuring the eye length

Abstract

With regard to the problem of specifying a device that permits a simple and robust measurement of the eye length, in particular without hardware modification on a camera, an optical device for use in an apparatus (13) for carrying out optical coherence tomography (OCT), comprising a cylindrical optical channel (1) for guiding and refracting light, which has a first diameter (1a) and a first length (1b), is characterised in that the first channel (1) is, in some sections, surrounded annularly and concentrically by a second optical channel (2) for guiding and refracting light, the second channel (2) having a larger diameter (2a) but a shorter length (2b) than the first channel (1).

Dependencies are inferred from the claim text.