Eye fixation monitor and tracker

Details Eye fixation monitor and tracker Eye fixation monitor and tracker

1998-10-15

2000-02-22

Manuel, George

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

A61B 310

Patent

active

060272163

ABSTRACT:
Apparatus and method are provided for assessing the direction of fixation of an eye by detecting polarization-related changes in light retroreflected from the fundus of the eye. Nerve fibers in the retina of the eye are birefringent and alter the polarization state of light traversing them as a function of their orientation. The nerve fibers are arrayed in a characteristic pattern in the retina, specifically radiating outward from the fovea and converging to the optic nerve head. By assessment of polarization-related changes in rctroreflected light from multiple retinal areas either sequentially or simultaneously, characteristic birefringence signatures of portions of the retina can be identified which are used to assess the direction of fixation of the eye. In addition, interference from the corneal birefringence is reduced by using incident light having a polarization state that is substantially independent of meridional direction. Circularly polarized light or non-polarized light is used for the assessment. Interference from the corneal birefringence is reduced still further by detecting polarization-related changes that are substantially independent of the meridional direction of the corneal birefringence. This is accomplished by detecting changes in ellipticity by measuring solely the Stokes parameter S.sub.3 or by measuring any two Stokes parameters. An alternative is measuring the overall intensity of the retroreflected light when the dichroism of the lutein pigment particles in the vicinity of the fovea is used for the assessment.

REFERENCES:
patent: 3462604 (1969-08-01), Mason
patent: 3473868 (1969-10-01), Young et al.
patent: 3724932 (1973-04-01), Cornsweet et al.
patent: 4145122 (1979-03-01), Rinard et al.
patent: 4586796 (1986-05-01), Molteno
patent: 4589776 (1986-05-01), Carver et al.
patent: 4702575 (1987-10-01), Breglia
patent: 4729652 (1988-03-01), Effert
patent: 4735498 (1988-04-01), Udden et al.
patent: 4836670 (1989-06-01), Hutchinson
patent: 4854694 (1989-08-01), Hirano et al.
patent: 4856891 (1989-08-01), Pflibsen et al.
patent: 4989968 (1991-02-01), Freedman
patent: 5152295 (1992-10-01), Kobayashi et al.
patent: 5177511 (1993-01-01), Feuerstein et al.
patent: 5220361 (1993-06-01), Lehmer et al.
patent: 5268711 (1993-12-01), Poxleitner et al.
patent: 5293187 (1994-03-01), Knapp et al.
patent: 5293535 (1994-03-01), Sensui
patent: 5303709 (1994-04-01), Dreher et al.
patent: 5327191 (1994-07-01), Shindo et al.
patent: 5331149 (1994-07-01), Spitzer et al.
patent: 5345281 (1994-09-01), Taboada et al.
patent: 5382989 (1995-01-01), Uomori et al.
patent: 5442412 (1995-08-01), Frey et al.
patent: 5485229 (1996-01-01), Hare
patent: 5576780 (1996-11-01), Yancey
patent: 5583335 (1996-12-01), Spitzer et al.
patent: 5652641 (1997-07-01), Konishi
patent: 5787890 (1998-08-01), Reiter et al.
patent: 5882301 (1999-03-01), Yoshida
Robinson (1963) "A Method of Measuring Eye Movement Using a Scleral Search Coil in a Magnetic Field", IEEE Transactions on Bio-Medical Electronics 10(3):137-145.
Plesch et al. (1987) "Digital Laser Scanning Fundus Camera", Applied Optics 26(8):1480-1486.
Young et al. (1975) "Survey of Eye Movement Recording Methods", Behavior Research Methods& Instrumentation 7(5):397-429.
Collewijn et al. (1975) "Precise Recording of Human Eye Movements", Vision. Res. 15:447-450.
Cornsweet et al. (1973) "Accurate Two-Dimensional Eye Tracker Using First and Fourth Purkinje Images", Journal of the Optical Society of America 63(8):921-928.
Reulen et al. (1988) "Precise Recording of Eye Movement: The IRIS Technique Part 1", Medical & Biological Engineering & Computing 26(1):20-25.
Wornson et al. (1987) "Fundus Tracking with the Scanning Laser Ophthalmoscope", Applied Optics 26(8):1500-1504.
klein Brink et al. (1988) "Birefringence of the Human Foveal Area Assessed in vivo with Mueller-Matrix Ellipsometry", J. Opt. Soc. Am. A. 5(1):49-57.
Dreher et al. (1992) "Spatially Resolved Birefringence of the Retinal Nerve Fiber Layer Assessed with a Retinal Laser Ellipsometer", Applied Optcis 31(19):3730-3735.
Weinreb et al. (1995) "Scanning Laser Polarimetry to Measure the Nerve Fiber Layer of Normal and Glaucomatous Eyes", American Journal of Ophthalmology 119(5):627-636.
Vrabec (1966) "The Temporal Raphe of the Human Retina", American Journal of Ophthalmology 62(5):926-938.
Weinreb et al. (1990) "Histopathologic Validation of Fourier-Ellipsometry Measurements of Retinal Nerve Fiber Layer Thickness", Arch Ophthalmol 108(4):557-560.
Dodt et al. (1900) "Visually Evoked Potentials in Respense to Rotating Plane-Polarized Blue Light", Ophthalmic Res 22:391-394.
Hochheimer et al. (1982) "Retinal Polarization Effects", Applied Optics 21(21):3811-3818.
Guyton et al. (1987) "Remote Optical Systems for Ophthalmic Examination and Vision Research", Applied Optics 26(8):1517-1526.
Sliney et al. (1980) "Current Laser Exposure Limits", Chapter 8, Safety With Lasers and Other Optical Sources, Plenum Press, New York, pp. 261-283.
Blokland et al. (1987) "Corneal Polarization in the Living Human Eye Explained with a Biaxial Model", J. Opt. Soc. Am. A 4(1):82-90.
PCT International Search Report, PCT/US98/22122, dated Jan. 29, 1999.

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