Intraocular lens visualization and tracking system

1. An ophthalmic visualization system, comprising:

a rear illumination system, to generate and to project a rear illumination light onto a retina of an eye that has an intraocular lens (IOL) implanted into the eye, so that the rear illumination light reflects from the retina as a reflected illumination light, wherein

a central portion of the reflected illumination light propagates through the IOL to form an IOL-focused illumination light, and

a peripheral portion of the reflected illumination light propagates around the IOL to form a peripheral illumination light;

an optic, to receive the IOL-focused illumination light and the peripheral illumination light from the eye, and to transmit the received illumination lights;

an aperture stop, to stop the transmitted peripheral illumination light, and to allow the IOL-focused illumination light to pass through; and

an imaging system, to form an isolated IOL image based on the transmitted IOL-focused illumination light.

2. The ophthalmic visualization system of claim 1 , the rear illumination system comprising:

an illumination light source, positioned off an optical path of the optic, to generate the rear illumination light; and

an illumination light beam splitter, to redirect the generated rear illumination light from the illumination light source into the optical path of the optic.

3. The ophthalmic visualization system of claim 1 , wherein:

the rear illumination light source is configured to generate one of a red and an infrared rear illumination light.

4. The ophthalmic visualization system of claim 1 , wherein:

the aperture stop is positioned at a location where the peripheral illumination light and the IOL-focused illumination light are spatially separated.

5. The ophthalmic visualization system of claim 1 , wherein:

the aperture stop is positioned at a location where the peripheral illumination light forms an annulus around and distinct from the IOL-focused illumination light.

6. The ophthalmic visualization system of claim 1 , the imaging system comprising:

a camera, to determine a location of the IOL from the isolated IOL image in an optic reference frame.

7. The ophthalmic visualization system of claim 6 , the camera comprising:

an image processor, to track a shift of the location of the IOL in the optic reference frame.

8. The ophthalmic visualization system of claim 7 , wherein:

the image processor is configured to track the shift of the location of the IOL by determining a cross-correlation using an image of a disk as a kernel.

9. The ophthalmic visualization system of claim 1 , the imaging system comprising:

a binocular microscope, to form the isolated IOL image.

10. The ophthalmic visualization system of claim 9 , wherein:

the optic is configured to form, from the reflected illumination light,

a first eye stereo beam for a first eyepiece of the binocular microscope, and

a second eye stereo beam for a second eyepiece of the binocular microscope; and

the aperture stop is positioned at a location where the peripheral illumination light and the IOL-focused illumination light of one of the first eye stereo beam and the second eye stereo beam are one of partially spatially shifted, and fully spatially shifted.

11. The ophthalmic visualization system of claim 1 , wherein:

an object plane of the imaging system is within a 3 mm vicinity of a plane of the IOL implanted in the eye.

12. The ophthalmic visualization system of claim 1 , wherein:

an object plane of the imaging system is within a 1 mm vicinity of a plane of the IOL implanted in the eye.

13. The ophthalmic visualization system of claim 1 , comprising:

a treatment light source, positioned off an optical path of the optic, to generate a treatment light; and

a treatment light beam splitter, to redirect the generated treatment light from the treatment light source into the optical path of the optic.

14. The ophthalmic visualization system of claim 13 , wherein:

the treatment light source is configured to generate an ultraviolet treatment light for adjusting an optical property of the implanted IOL.

15. A method of tracking an intraocular lens, the method comprising:

rear-illuminating an eye that has an implanted intraocular lens (IOL), with an ophthalmic visualization system by

generating a rear illumination light with a rear illumination system and projecting the rear illumination light with an optic onto a retina of the eye, so that a portion of the rear illumination light reflects from the retina as a reflected illumination light, wherein

a central portion of the reflected illumination light propagates through the IOL to form an IOL-focused illumination light, and

a peripheral portion of the reflected illumination light propagates around the IOL to form a peripheral illumination light;

receiving and transmitting the IOL-focused illumination light and the peripheral illumination light by the optic;

stopping the transmitted peripheral illumination light by an aperture stop;

allowing the transmitted IOL-focused illumination light to pass through by the aperture stop; and

forming an isolated IOL image based on the transmitted IOL-focused illumination light by an imaging system.

16. The method of claim 15 , comprising:

determining a location of the IOL from the isolated IOL image with an image processor of the imaging system, in an optic reference frame.