Presbyopia correction through negative high-order spherical aberration
View Patent ↗Devices, systems, and methods for treating and/or determining appropriate prescriptions for one or both eyes of a patient are particularly well-suited for addressing presbyopia, often in combination with concurrent treatments of other vision defects. High-order spherical aberration may be imposed in one or both of a patient's eyes, often as a controlled amount of negative spherical aberration extending across a pupil. A desired presbyopia-mitigating quantity of high-order spherical aberration may be defined by one or more spherical Zernike coefficients, which may be combined with Zernike coefficients generated from a wavefront aberrometer. The resulting prescription can be imposed using refractive surgical techniques such as laser eye surgery, using intraocular lenses and other implanted structures, using contact lenses, using temporary or permanent corneal reshaping techniques, and/or the like.
1. A method for treating presbyopia of a patient having an eye, the eye having a cornea, a retina, and a pupil, the method comprising the step for:
defining an intra-ocular lens for implantation into the eye so as to alter the optics of the eye, the altered eye having a presbyopia-mitigating quantity of negative spherical aberration such that the altered eye forms an image, in a plane between the cornea and the retina, of a point source at a viewing distance from the treated eye, and such that the image has a central area with a central intensity surrounded by a peripheral area with a peripheral intensity, the central intensity being higher than the peripheral intensity; and
implanting the intra-ocular lens into the eye.
2. A method for treating presbyopia of a patient having an eye, the eye having a cornea, a retina, and a pupil, the method comprising:
implanting an intra-ocular lens into the eye so as to alter the optics of the eye so that the effect of presbyopia is mitigated, the altered eye having a quantity of negative spherical aberration corresponding to a range from about 0.05 to about 0.4 microns of negative spherical aberration across a 6 mm aperture such that the altered eye forms an image, in a plane between the cornea and the retina, of a point source at a viewing distance from the treated eye, and such that the image has a central area with a central intensity surrounded by a peripheral area with a peripheral intensity, the central intensity being higher than the peripheral intensity.
3. The method of claim 2 , further comprising sharpening the image using residual accommodation of the eye.
4. The method of claim 3 , wherein the negative spherical aberration is in a range from about 0.1 to about 0.3 microns of negative spherical aberration across the pupil.
5. The method of claim 4 , wherein the negative spherical aberration is in a range from about 0.15 to about 0.25 microns of negative spherical aberration across the pupil.
6. The method of claim 3 , wherein the negative spherical aberration comprises a radially symmetric negative spherical asphericity.
7. The method of claim 6 , wherein the negative spherical aberration corresponds to at least one high-order Zernike polynomial coefficient.
8. The method of claim 7 , wherein the negative spherical aberration corresponds to a plurality of high-order Zernike polynomial coefficients.
9. The method of claim 6 , wherein a combined alteration to the optical properties of the eye is imposed by the implanting of the intra-ocular lens, wherein the combined alteration corresponds to a combined prescription comprising a refractive defect-correcting prescription for the eye.
10. The method of claim 9 , further comprising
measuring refractive aberrations of the eye with a wavefront aberrometer;
determine wavefront Zernike coefficients of the measured refractive aberrations; and
defining the combined prescription for the eye by combining the wavefront Zernike coefficients with at least one high-order Zernike coefficient corresponding to the quantity of negative spherical aberration.
11. The method of claim 3 , further comprising:
identifying the quantity of high-order negative spherical aberration; and
determining a presbyopia prescription providing the identified quantity of spherical aberration;
wherein implanting the intra-ocular lens imposes the presbyopia prescription on the eye.
12. The method of claim 3 , further comprising creating the intra-ocular lens.
13. A method for treating presbyopia in a patient having an eye with a pupil, the method comprising altering refraction of the eye by implanting an intra-ocular lens into the eye so that the altered eye has a negative spherical aberration corresponding to a range from about 0.05 to about 0.4 microns of negative spherical aberration across a 6 mm aperture so that the effect of presbyopia is mitigated.