Multitask vision architecture for refractive vision corrections
A multitask vision architecture is constructed based on multitask vision-metrics derived from wave aberration of the eye. The multitask vision metrics include at least one of the followings: vision clarity of eye that measures optical quality of an eye against those in a cohort of eyes with normal acuity, aberration-induced vision symptoms, retinal image quality for best vision and night vision, and retinal image quality for a range of focus depth. The multitask vision architectures is applied for determining a wavefront shape for an optimized vision correction, for specifying excessive aberrations in an eye, and for specifying quality of a vision product.
1. A method for determining an optimized wavefront correction, the method comprising:
obtaining at least one wave aberration of an eye;
selecting at least one performance target based on optical quality of a cohort of eyes with normal visual acuity;
determining a post-correctional wavefront by altering aberrations in the eye to meet the selected performance target;
determining an optimized wavefront correction from the difference between the obtained wave aberration of the eye and the determined post-correctional wavefront that meets the selected performance target.
2. The method of claim 1 , wherein obtaining at least one wave aberration of an eye comprises measuring at least one wave aberration of an eye with a wavefront aberrometer, including a Hartmann-Shack sensor based-aberrometer.
3. The method of claim 1 , wherein the selected performance target relates to a Modulation-Transfer Function (MTF) of an eye for at least one spatial frequency.
4. The method of claim 3 , wherein the selected performance target is a Modulation-Transfer Function (MTF) of at least one real eye that is ranked above 98 percentile in MTFs of a cohort of eyes with normal acuity.
5. The method of claim 3 , wherein the selected performance target is a relative Modulation-Transfer Function (MTF) score at or above 50 percentile rank in MTFs of a cohort of eyes with normal acuity.
6. The method of claim 3 , wherein the selected performance target is a relative Modulation-Transfer Function (MTF) score at about 15 percentile rank in a cohort of eyes with normal acuity.
7. The method of claim 1 , wherein determining a post-correctional wavefront by altering aberrations in the eye to meet the selected performance target comprises:
changing certain aberrations in the eye;
obtaining a residual wavefront from the difference between the wave aberration of the eye and the changed certain aberrations in the eye;
calculating at least one image performance parameter from the residual wavefront and comparing it against the selected performance target;
determining a post-correctional wavefront in a recursive process until the selected performance target is reached.
8. The method of claim 7 , further includes evaluation of retinal images with the determined post-correctional wavefront comprising:
calculating at least one point-spread function from the post-correctional wavefront;
calculating at least one retinal image by convolving the point-spread function of eye with at least one optical object for vision evaluation;
accepting or rejecting the optimized wavefront based on the calculated retinal image.
9. The method of claim 8 , wherein the optical object for vision evaluation is a resolution chart for acuity tests.
10. The method of claim 8 , wherein the optical object for vision evaluation is a specially designed object for diagnosing vision symptoms, including aberration-induced glare, halo, ghost image, and starburst.
11. The method of claim 7 , further comprises evaluation of vision for a plurality of pupil sizes.
12. The method of claim 7 , further comprises evaluation of vision for a plurality of focus depth with the determined post-correctional wavefront.
13. The method of claim 1 , further includes a laser vision correction procedure based on the determined wavefront shape for an optimized correction comprising:
a processor for generating an ablation pattern of laser energy for ablation of a corneal tissue of the eye so as to achieve a wavefront-guided vision correction, the ablation pattern based at least in part on the determined wavefront shape for an optimized correction; and
a laser system for directing laser energy onto the corneal tissue of the eye to achieve the generated ablation pattern.
14. The method of claim 1 , further includes a system for producing a wavefront-guided contact lenses or intro-ocular lens, based at least in part on the determined wavefront shape for an optimized correction.
15. The method of claim 1 , further includes a system for producing a wavefront-guided spectacles, based at least in part on the determined wavefront shape for an optimized correction.
16. The method of claim 1 , wherein determining a post-correctional wavefront by altering aberrations in the eye to meet the selected performance target is a recursive process comprising:
reducing a portion of aberrations in the wave aberration of the eye;
obtaining a residual wavefront by the difference between the wave aberration of the eye and the reduced aberrations;
calculating an image performance parameter from the obtained residual wavefront and comparing it against the selected performance target;
determining a post-correctional wavefront by reducing more aberrations in the eye until the selected performance target is met.
17. The method of claim 1 , further includes specifying excessive aberrations of an eye from the difference between the obtained wave aberration of the eye and the determined post-correctional wavefront.
18. The method of claim 17 , wherein the selected performance target is a Modulation-Transfer Function (MTF) of an eye for at least one spatial frequency.
19. The method of claim 17 , wherein the selected performance target is a Modulation-Transfer Function (MTF) of at least one real eye that is ranked above 98 percentile in MTFs of a cohort of eyes with normal acuity.
20. The method of claim 17 , wherein the selected performance target is a relative Modulation-Transfer Function (MTF) score at or above 50 percentile rank in MTFs of a cohort of eyes with normal acuity.
21. A method for specifying quality of a vision product including lenses and refractive surgeries, the method comprising:
obtaining at least one wave aberration of an eye with a vision product;
calculating at least one image quality parameter from the obtained wave aberration;
specifying quality of a vision product by a relative scare based on the calculated image quality parameter from the obtained wave aberration of the eye and the same parameter obtained from a cohort of eyes with normal visual acuity.
22. The method of claim 21 , wherein obtaining at least one wave aberration of an eye after a vision correction comprises measuring at least one wave aberration of an eye with a wavefront aberrometer, including a Hartmann-Shack sensor based-aberrometer.
23. The method of claim 21 . wherein the calculated image performance parameter is a modulation-transfer function (MTF) of the eye for at least one spatial frequency.
24. The method of claim 23 , wherein the specified quality of a vision product is represented by a numerical number including a percentile rank by ranking the calculated MTF of the tested eye against those MTFs of a cohort of eyes with normal acuity.
25. The method of claim 21 , wherein the calculated image quality parameter is a Strehl Ratio, or a volume under a 2-dimensional MTF of the eye up to a spatial frequency about 60 cycle/deg.
26. The method of claim 21 , further includes a vision screening comprises:
measuring at least one wave aberrations of the eye without using a vision product;
calculating at least one image quality parameter from the wave aberration without the vision product;
screening vision quality of the eye in a relative score by ranking the calculated image quality parameter from the eye against those from a cohort of eyes with normal visual acuity.
27. The method of claim 21 , further includes specification of quality of a vision product in a plurality of pupil sizes.
28. A method for specifying quality of a correction lens, the method comprising:
obtaining at least one wave aberration of an eye;
measuring at least one wavefront of an correction lens from a wavefront lensometer;
determining a post-correctional wavefront by combining the obtained wave aberration of the eye and the measured wavefront of the correction lens;
calculating at least one image quality parameter from the post-correctional wavefront;
specifying quality of a correction lens in a relative score based on optical quality of a cohort of eyes with normal visual acuity.
29. The method of claim 28 , wherein the calculated image performance parameter is a modulation-transfer function (MTF) of the eye for at least one spatial frequency.
30. The method of claim 28 , wherein specifying the image performance parameter in a relative score based on optical quality of a cohort of eyes with normal visual acuity is represented by a numerical number including a percentiles by ranking the calculated MTF of the tested eye against MTFs of a cohort of eyes with normal acuity.
31. The method of claim 28 , wherein the calculated image quality parameter is a Strehl Ratio, or a volume under a 2 dimension MTF of the eye up to a spatial frequency about 60 cycle/deg.
32. The method of claim 28 , further includes specification of quality of a correction lens in a plurality of pupil sizes.