Methods and systems for determining refractive corrections of human eyes for eyeglasses

• US 10,444,539 B2
• Filed: 06/23/2017
• Issued: 10/15/2019
• Est. Priority Date: 05/11/2016
• Status: Active Grant

• Current Assignee: Perfect Vision Technology (HK) Ltd.
• Original Assignee: Perect Vision Technology Limited
• Inventors: Liang, Junzhong
• Primary Examiner(s): Thomas, Brandi N
• Application Number:
  US15/631,935
• Publication Number:
  US 20170329154A1
• Time in Patent Office: 844 Days
• Field of Search: 351200, 351205-206, 351210, 351216, 351221-223, 351232, 351236
• CPC Class Codes: A61B 3/0033 characterised by user input arrangements
• CPC Class Codes: A61B 3/0285 Phoropters
• CPC Class Codes: A61B 3/1015 for wavefront analysis
• CPC Class Codes: A61B 3/103 for determining refraction, e.g. refractometers, skiascopes
• CPC Class Codes: A61B 3/185 characterised by modular construction
• CPC Class Codes: G02C 2202/22 Correction of higher order and chromatic aberrations, wave front measurement and calculation
• CPC Class Codes: G02C 7/027 considering wearer's parameters

Abstract

Methods, devices, and systems are disclosed for determining refractive corrections of human eyes to reduce and eliminate image distortion associated with eyeglasses. In some embodiments, an objective refraction module is configured to measure refractive errors of an eye objectively, without subjective feedback from a tested subject. A computation module is configured to generate a plurality of objective prescriptions. A phoropter module is configured to perform a subjective refraction for determining a plurality of subjective spherical powers based on the plurality of objective prescriptions. An output module is configured to generate a plurality of prescriptions for eyeglasses, the plurality of prescriptions comprising (a) a first prescription having a first subjective spherical power f_s1, a first objective cylinder power F_c1, and a first objective cylinder angle F_a1, and (b) a second prescription having a second subjective spherical power f_s2, a second objective cylinder power F_c2, and a second objective cylinder angle F_a2.

Claims

1. A method for determining refractive prescription for eyeglasses, the method comprising:

using an objective refraction device to measure refractive errors of an eye of a tested subject objectively, wherein the objective refraction device excludes subjective feedback from the tested subject;

generating a plurality of objective prescriptions for the tested subject from the refractive errors of the eye measured objectively, wherein;

the plurality of objective prescriptions comprises (i) a first objective prescription having a first objective spherical power F_s1, a first objective cylinder power F_c1, and a first objective cylinder angle F_a1, and (ii) a second objective prescription having a second objective spherical power F_s2, a second objective cylinder power F_c2, and a second objective cylinder angle F_a2; and

the first objective cylinder power F_c1 and the first objective cylinder angle F_a1 of the first objective prescription are optimized for image quality, and the second objective cylinder power F_c2 and the second objective cylinder angle F_a2 of the second objective prescription are determined for a reduced image quality compared to that of the first objective prescription, or for obtaining reduced magnification differences at different orientations;

using a phoropter to perform a subjective refraction to determine a plurality of subjective spherical powers, wherein the plurality of subjective spherical powers comprises a first subjective spherical power f_s1 and a second subjective spherical power f_s2;

wherein the phoropter comprises a plurality of spherical lenses and cylindrical lenses,

wherein control of the cylindrical lenses is based only on the plurality of objective prescriptions;

wherein the subjective refraction requires subjective feedback from the tested subject reading a chart through the phoropter; and

generating a plurality of prescriptions for eyeglasses from the plurality of objective prescriptions and the subjective refraction, the plurality of prescriptions for eyeglasses comprising (a) a first prescription having the first subjective spherical power f_s1, the first objective cylinder power F_c1, and the first objective cylinder angle F_a1, and (b) a second prescription having the second subjective spherical power f_s2,

the second objective cylinder power F_c2, and the second objective cylinder angle F_a2.

2. The method of claim 1 further comprising generating a final prescription for eyeglasses according to a final preference given by the tested subject, the final preference being based on the tested subject wearing trial lenses according to the generated plurality of prescriptions for eyeglasses.

3. The method of claim 2 wherein the final prescription for eyeglasses further comprises a spherical aberration.

4. The method of claim 1 wherein the using the objective refraction device comprises measuring a wavefront error of the eye, wherein the wavefront error includes coma and spherical aberration in the eye.

5. The method of claim 1 wherein the first objective cylinder power and the second objective cylinder power are different from each other.

6. The method of claim 5 wherein the plurality of prescriptions for eyeglasses takes into account at least one of (i) refraction data for a left eye and a right eye of the tested subject, and (ii) refraction data of eyeglasses previously worn by the tested subject.

7. The method of claim 1 wherein the first objective cylinder angle and the second objective cylinder angle are different from each other.

8. The method of claim 7 wherein the plurality of prescriptions for eyeglasses takes into account at least one of (i) refraction data for a left eye and a right eye of the tested subject, and (ii) refraction data of eyeglasses previously worn by the tested subject.

9. A system for determining refractive prescription of eyeglasses, comprising:

an objective refraction module configured to measure refractive errors of an eye of a tested subject objectively, wherein the objective refraction module excludes subjective feedback from the tested subject; and

a computation module configured to generate a plurality of objective prescriptions for the tested subject from the refractive errors of the eye measured objectively, wherein;

the plurality of objective prescriptions comprises (i) a first objective prescription having a first objective spherical power F_s1, a first objective cylinder power F_c1, and a first objective cylinder angle F_a1, and (ii) a second objective prescription having a second objective spherical power F_s2, a second objective cylinder power F_c2, and a second objective cylinder angle F_a2; and

the first objective cylinder power F_c1 and the first objective cylinder angle F_a1 of the first objective prescription are optimized for image quality, and the second objective cylinder power F_c2 and the second objective cylinder angle F_a2 of the second objective prescription are determined for a reduced image quality compared to that of the first objective prescription, or for obtaining reduced magnification differences at different orientations.

10. The system of claim 9 wherein the objective refraction module is further configured to measure a wavefront error of the eye, wherein the wavefront error includes coma and spherical aberration in the eye.

11. The system of claim 9 wherein the first objective cylinder power and the second objective cylinder power are different from each other.

12. The system of claim 11 wherein the plurality of prescriptions for eyeglasses takes into account at least one of (i) refraction data for a left eye and a right eye of the tested subject, and (ii) refraction data of eyeglasses previously worn by the tested subject.

13. The system of claim 9 wherein the first objective cylinder angle and the second objective cylinder angle are different from each other.

14. The system of claim 13 wherein the plurality of prescriptions for eyeglasses takes into account at least one of (i) refraction data for a left eye and a right eye of the tested subject, and (ii) refraction data of eyeglasses previously worn by the tested subject.

15. The system of claim 9 wherein the plurality of prescriptions for eyeglasses further comprises a spherical aberration.

16. The system of claim 9 further comprising a phoropter module configured to perform a subjective refraction for determining a plurality of subjective spherical powers based on the plurality of objective prescriptions from the computation module, wherein the plurality of subjective spherical powers comprises a first subjective spherical power f_s1 and a second subjective spherical power f_s2;

wherein the phoropter module comprises a plurality of spherical lenses and cylindrical lenses, wherein control of the cylindrical lenses is based only on the plurality of objective prescriptions;

wherein the subjective refraction requires subjective feedback from the tested subject reading a chart through the phoropter module.

17. The system of claim 16 further comprising an output module configured to generate a plurality of prescriptions for eyeglasses from the plurality of objective prescriptions and the subjective refraction, the plurality of prescriptions comprising (a) a first prescription having the first subjective spherical power f_s1, the first objective cylinder power F_c1, and the first objective cylinder angle F_a1, and (b) a second prescription having the second subjective spherical power f_s2, the second objective cylinder power F_c2, and the second objective cylinder angle F_a2.

18. The system of claim 17 wherein the objective refraction module is further configured to measure a wavefront error of the eye, wherein the wavefront error includes coma and spherical aberration in the eye.

19. The system of claim 17 wherein the first objective cylinder power and the second objective cylinder power are different from each other.

20. The system of claim 19 wherein the plurality of prescriptions for eyeglasses takes into account at least one of (i) refraction data for a left eye and a right eye of the tested subject, and (ii) refraction data of eyeglasses previously worn by the tested subject.

21. The system of claim 17 wherein the first objective cylinder angle and the second objective cylinder angle are different from each other.

22. The system of claim 21 wherein the plurality of prescriptions for eyeglasses takes into account at least one of (i) refraction data for a left eye and a right eye of the tested subject, and (ii) refraction data of eyeglasses previously worn by the tested subject.

23. The system of claim 17 wherein the plurality of prescriptions for eyeglasses further comprises a spherical aberration.