Eye tracker for refractive surgery
First Claim
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1. A method of determining the position of the pupil of an eye, including the steps of:
- directing an eye-safe light beam having a plurality of components onto the eye, said components defining an area of incidence for the beam on the eye substantially larger than the pupil of the eye;
receiving an image of light thereafter reflected by the eye;
analysing the image by identifying which of the light beam components produces a bright eye reflection in said image;
determining the position of the pupil by further analysing image on the basis of said identification.
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Abstract
A method of determining the position or attitude of an eye, including the steps of directing a plurality of eye-safe light beam components onto the eye, said components defining an area of incidence on the eye substantially larger than the pupil; receiving an image of light thereafter reflected by the eye; analyzing the image by identifying which of the light beam components produces a bright eye reflection in said image; and determining the position or attitude of the eye by further analysing the image on the basis of said identification.
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Citations
51 Claims
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1. A method of determining the position of the pupil of an eye, including the steps of:
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directing an eye-safe light beam having a plurality of components onto the eye, said components defining an area of incidence for the beam on the eye substantially larger than the pupil of the eye;
receiving an image of light thereafter reflected by the eye;
analysing the image by identifying which of the light beam components produces a bright eye reflection in said image;
determining the position of the pupil by further analysing image on the basis of said identification. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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23. Apparatus for determining the position of the pupil of an eye, including:
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means for directing an eye-safe light beam having a plurality of components onto an eye, said components defining an area of incidence for the beam on the eye substantially larger than the pupil of the eye;
means for receiving an image of light thereafter reflected by the eye;
means for analysing the image by identifying which of the light beam components produces a bright eye reflection in said image, and for further analysing the image on the basis of such identification, whereby to determine the position of the pupil.
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40. Apparatus for facilitating determination of the position of the pupil of an eye, including:
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means for generating an eye-safe light beam;
optical means disposed to receive said light beam for splitting it into a plurality of light beam components to be directed onto an eye, said components defining an area of incidence for the beam on the eye substantially larger than the pupil of the eye; and
means for receiving an image of light thereafter reflected by the eye;
wherein said light beam defines a device comprising one or more devices selected from a pair of crossed lines, a grid of intersecting lines, and an array of light spots that respectively form said plurality of components. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 50)
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49. An apparatus for determining the position of the pupil of an eye during refractive surgery so that the aim of an ablative laser can be adjusted accordingly, including:
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laser means for producing a beam of ablative radiation;
a first infra-red light source for illuminating the pupil of said eye;
an optical system for directing said first infra-red source;
a second infra-red light source for illuminating the iris of said eye;
focussing means for focussing light reflected from surfaces of the eye;
recording means for recording images of the light reflected from said surfaces;
image processing means for determining the position of the pupil of the eye; and
controller means for directing said laser to the appropriate position on the cornea in accordance with the determined position of the pupil.
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51. A method for determining the position of the pupil of an eye during ablative laser surgery so that the aim of the ablative laser can be adjusted accordingly, including:
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directing a first beam of infra-red light from a first position onto said eye;
directing at least one second beam of infra-red light from a second position onto said eye through an optical system;
imaging light from said first and second beams reflected from said eye to form first and second images respectively; and
comparing said images to determine said position of the pupil of said eye.
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Specification
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Current AssigneeNatalie Marguerita Taylor, Paul Phillip Van Saarloos
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Original AssigneeNatalie Marguerita Taylor, Paul Phillip Van Saarloos
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InventorsTaylor, Natalie Marguerita, Van Saarloos, Paul Phillip
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Application NumberUS09/849,015Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current351/204CPC Class CodesA61B 3/113 for determining or recordin...A61F 2009/00846 EyetrackingA61F 2009/00872 CorneaA61F 9/00804 Refractive treatmentsG06T 2207/30041 Eye; Retina; OphthalmicG06T 7/73 using feature-based methodsG06V 40/193 Preprocessing; Feature extr...
