Patent ID: 8534838

Claim:
An apparatus for performing measurements on an eye, including measuring a depth of an anterior chamber, a lens thickness, a corneal thickness, retinal layer thicknesses or an axial length, wherein the apparatus comprises an interferometer that focuses at least one measurement beam into the eye along an optical axis at a focus, collects back-scattered radiation and interferometrically generates a measurement signal indicating structures of the eye by time-domain, spectral-domain or Fourier-domain coherence reflectometry; an adjustment device that laterally and/or axially shifts the focus in the eye or varies a polarization state of the measurement beam; a control device that controls the interferometer, wherein the control device generates a plurality of A-scan individual signals from the back-scattered radiation and combines the plurality of A-scan individual signals to form an A-scan measurement signal, the control device controlling the adjustment device that shifts the position of the focus or varies the polarization during collection of the back-scattered radiation from which the control device generates the A-scan individual signals; and wherein the back-scattered radiation contributes to the A-scan measurement signal in a plurality of differing positions of the focus or in a plurality of differing polarization states of the measurement radiation.