Compound modulation transfer function for laser surgery and other optical applications
Methods, devices, and systems establish an optical surface shape that mitigates or treats a vision condition in a patient. An optical surface shape for a particular patient can be determined using a set of patient parameters for the specific patient by using a compound modulation transfer function (CMTF). The compound modulation transfer function can include a combination of modulation transfer functions (MTF's) at a plurality of distinct frequencies.
1. A method of evaluating an image quality provided by a vision treatment shape, the method comprising:
obtaining a plurality of through-focus compound modulation transfer function (CMTF) values for the vision treatment shape;
comparing the plurality of through-focus CMTF values to a CMTF threshold value; and
evaluating the image quality based on the comparison between the through-focus CMTF values and the CMTF threshold value.
2. The method according to claim 1 , wherein the plurality of through-focus compound modulation transfer function (CMTF) values are based on a point spread function.
3. The method according to claim 2 , wherein the point spread function is a polychromatic point spread function.
4. The method according to claim 1 , wherein the CMTF threshold value is 0.1.
5. The method according to claim 1 , wherein the CMTF threshold value is greater than 0.1.
6. The method according to claim 1 , wherein the CMTF threshold is about 0.3.
7. A method of determining a compound modulation transfer function (CMTF) threshold value for a CMTF spatial frequency set, the method comprising:
obtaining a plurality of through-focus CMTF values for a vision treatment shape, wherein the CMTF values are based on the CMTF spatial frequency set;
obtaining a plurality of through-vergence convolved images based on the vision treatment shape and a point spread function; and
determining the CMTF threshold value for the CMTF spatial frequency set based on the plurality of through-focus CMTF values and the plurality of convolved images.
8. The method according to claim 7 , wherein the plurality of through-vergence convolved images comprises a plurality of through-vergence convolved eye chart letters.
9. The method according to claim 7 , wherein the point spread function is a polychromatic point spread function.
10. A system for evaluating an image quality provided by a vision treatment shape, the system comprising:
an input that accepts a plurality of through-focus compound modulation transfer function (CMTF) values for the vision treatment shape;
a module comprising a tangible non-transitory medium embodying machine-readable code that compares the plurality of through-focus CMTF values to a CMTF threshold value; and
a module comprising a tangible non-transitory medium embodying machine-readable code that evaluates the image quality based on the comparison between the through-focus CMTF values and the CMTF threshold value.
11. The system according to claim 10 , wherein the plurality of through-focus compound modulation transfer function (CMTF) values are based on a point spread function.
12. The system according to claim 11 , wherein the point spread function is a polychromatic point spread function.
13. The system according to claim 11 , wherein the CMTF threshold value is greater than about 0.1.
14. The system according to claim 11 , wherein the CMTF threshold value is greater than about 0.3.
15. A computer program product for evaluating an image quality provided by a vision treatment shape, the computer program product comprising:
code for accepting a plurality of through-focus compound modulation transfer function (CMTF) values for the vision treatment shape;
code for comparing the plurality of through-focus CMTF values to a CMTF threshold value;
code for evaluating the image quality based on the comparison between the through-focus CMTF values and the CMTF threshold value; and a
computer-readable non-transitory medium for storing the codes.
16. The computer program product according to claim 15 , wherein the plurality of through-focus compound modulation transfer function (CMTF) values are based on a point spread function.
17. The computer program product according to claim 15 , wherein the point spread function is a polychromatic point spread function.
18. The computer program product according to claim 15 , wherein the CMTF threshold value is greater than about 0.1.
19. The computer program product according to claim 15 , wherein the CMTF threshold value is greater than about 0.3.
20. The computer program product according to claim 15 , wherein the CMTF threshold value is within a range from about 0.1 to about 0.3.