Patent ID: 8857985

Claim:
An ophthalmic measurement device comprising: a light source configured to emit a beam of light; a reference optical path; a detector configured to output an intensity signal indicating the intensity of a beam of light received at the detector; at least one optical coupling device configured to receive the beam of light, couple a first portion of the beam of light to the reference optical path, direct a second portion of the beam of light as an illumination beam to the eye of a patient, couple a returned beam from the eye of the patient with a reference beam from the reference optical path to form a low coherence interference beam and direct the low coherence beam to the detector; a scanning element, positioned to intercept the illumination beam, configured to direct/scan the illumination beam to/on the eye of the patient; a large diopter range real time wavefront sensor with the large diopter range real time wavefront sensor initially calibrated for predetermined distances to selected anatomical features and configured to output wavefront measurements of the eye of the patient; a controller, coupled to the light source, to the scanning element, to the large diopter range real time wavefront sensor, and to the detector, with the controller configured to control the scanning element to cause reflection(s) of the illumination beam from one or more selected anatomical feature(s) of the eye of a patient to form the returned beam returned to the optical coupling device, to process the intensity signal output by the detector when the low coherence interference beam is used to determine the distance to the selected anatomical features using low coherence optical interferometry techniques and to compensate axial movement of the patient eye for the wavefront measurement.