Apparatus and method for operating a real time large diopter range sequential wavefront sensor

• US 9,107,608 B2
• Filed: 11/07/2013
• Issued: 08/18/2015
• Est. Priority Date: 01/20/2006
• Status: Expired due to Fees

• Current Assignee: Clarity Medical Systems, Inc.
• Original Assignee: Clarity Medical Systems, Inc.
• Inventors: Zhou, Yan, Chew, Bradford, Shea, William
• Primary Examiner(s): MAI, HUY KIM
• Application Number:
  US14/074,125
• Publication Number:
  US 20140063457A1
• Time in Patent Office: 649 Days
• Field of Search: 351/205, 351/209, 351/210, 351/212, 351/246
• US Class Current: 1/1
• CPC Class Codes: A61B 3/0025 characterised by electronic signal processing, e.g. eye models
• CPC Class Codes: A61B 3/1015 for wavefront analysis
• CPC Class Codes: A61B 3/102 for optical coherence tomography [OCT]
• CPC Class Codes: A61B 3/1035 for measuring astigmatism testing astigmatism A61B3/036
• CPC Class Codes: A61B 3/112 for measuring diameter of pupils
• CPC Class Codes: A61B 3/113 for determining or recording eye movement
• CPC Class Codes: A61B 3/132 in binocular arrangement
• CPC Class Codes: A61B 3/14 Arrangements specially adapted for eye photography apparatus or arrangements for taking photographs per se G03B
• CPC Class Codes: A61B 3/152 for aligning
• CPC Class Codes: A61F 2009/00848 based on wavefront
• CPC Class Codes: G01J 1/0414 using plane or convex mirrors, parallel phase plates, or plane beam-splitters
• CPC Class Codes: G01J 1/0437 using masks, aperture plates, spatial light modulators, spatial filters, e.g. reflective filters
• CPC Class Codes: G01J 2003/064 Use of other elements for scan, e.g. mirror, fixed grating
• CPC Class Codes: G01J 9/00 Measuring optical phase difference devices or arrangements for controlling the phase of light beams G02F1/01; Determining degree of coherence; Measuring optical wavelength spectrometry G01J3/00

Abstract

An wavefront including a light source for providing a light beam to illuminate a subject eye and a beam deflecting to deflect the light beam to compensate transverse movement of the subject eye. A second beam deflecting element scans the beam around a small portion of the retina to dissipate energy.

Claims

1. A wavefront sensor comprising:

a light source configured to output a light beam for illumination of a subject eye;

a first beam deflecting element configured to intercept the light beam and direct the light beam toward the subject eye; and

a controller, coupled to the light source and beam deflecting element, configured to control the beam deflecting element to compensate transverse movement of the subject eye.

2. The wavefront sensor of claim 1 further comprising:

an image detector configured to output an image of the subject eye; and

with the controller coupled to the image detector and further configured to process the image to determine the transverse movement of the subject eye.

3. The wavefront sensor of claim 2 with the controller further configured to control the first beam deflecting element to track the transverse movement of the subject eye.

4. The wavefront sensor of claim 1 where the light source is a superluminescent diode.

5. The wavefront sensor of claim 1 where the beam deflecting element is a micro-electromechanical system (MEMS) reflector.

6. The wavefront sensor of claim 1 further comprising:

a second beam deflecting element configured to receive the light beam and direct the light beam toward the subject eye;

and with the controller further configured to control the second beam deflecting element to scan the light beam around a small portion of the retina of the subject eye while controlling the first beam deflecting element to compensate transverse movement of the eye.

7. The wavefront sensor of claim 6 further comprising:

a first focusing element to focus the light beam to a small area;

and with the controller further configured to increase peak power of the light source when the light beam is scanned around the small portion of the retina.

8. The wavefront sensor of claim 1 further comprising:

a second lens having a back focal plane positioned at the first beam deflecting element and configured to direct and focus the light beam to the subject eye so that compensating by the first beam deflecting element does not cause movement of SLD beam on the retina of an emmetropic subject eye.