Optical diagnosis using measurement sequence
Devices, systems, and methods that facilitate optical analysis, particularly for the diagnosis and treatment of refractive errors of the eye. An optical diagnostic method for an eye includes obtaining a sequence of aberration measurements of the eye, identifying an outlier aberration measurement of the sequence of aberration measurements, and excluding the outlier aberration measurement from the sequence of aberration measurements to produce a qualified sequence of aberration measurements. The sequence of aberrations measurements can be obtained by using a wavefront sensor. An optical correction for the eye can be formulated in response to the qualified sequence of aberration measurements.
1. An optical diagnostic method for a single eye having a pupil, the method comprising:
obtaining a time sequence of aberration measurements of the single eye, wherein each aberration measurement in the time sequence of aberration measurements is associated with a time parameter;
identifying an outlier aberration measurement of the time sequence of aberration measurements based on an analysis of a change of at least one measured property of the single eye with time; and
excluding the outlier aberration measurement from the time sequence of aberration measurements to produce a qualified time sequence of aberration measurements.
2. The method of claim 1 , further comprising formulating an optical correction for the single eye in response to the qualified time sequence of aberration measurements.
3. The method of claim 1 , wherein the time sequence of aberrations measurements are obtained by using a wavefront sensor.
4. The method of claim 1 , further comprising registering at least one of the time sequence of aberration measurements or the qualified time sequence of aberration measurements by using at least one of a location of the single eye or an orientation of the single eye.
5. The method of claim 1 , wherein the step of identifying an outlier aberration measurement comprises:
determining a time sequence of coefficients corresponding to a component aberration of the single eye in response to the time sequence of aberration measurements; and
processing the time sequence of coefficients to determine whether the component aberration is statistically significant.
6. The method of claim 5 , wherein the step of identifying an outlier aberration measurement comprises processing the time sequence of coefficients to identify an outlier aberration measurement.
7. The method of claim 1 , wherein the step of identifying an outlier aberration measurement comprises identifying a post-blink aberration measurement that follows a blink of the single eye by less than a predetermined amount of time.
8. The method of claim 7 , wherein the step of identifying a post-blink aberration measurement comprises at least one of detecting a radius of the pupil that is less than a predetermined value, detecting a rate of change of a radius of the pupil that is greater than a predetermined rate, or detecting a radius of the pupil that is inconsistent with a linear interpolation based on nearby qualified radius measurements of the pupil.
9. The method of claim 1 , wherein the step of identifying an outlier aberration measurement comprises identifying a sphere equivalent refraction (SEQ) of the single eye that is outside a predetermined range.
10. The method of claim 1 , wherein the step of identifying an outlier aberration measurement comprises identifying a rate of change of SEQ of the single eye that is greater than a predetermined rate.
11. The method of claim 1 , wherein the step of identifying an outlier aberration measurement comprises identifying a SEQ of the single eye for a measurement corresponding to viewing a far viewing target that differs from a manifest refraction of the single eye by more than a predetermined value.
12. The method of claim 1 , wherein the step of identifying an outlier aberration measurement comprises identifying a SEQ of the single eye for a measurement corresponding to viewing a near viewing target that differs from a manifest refraction of the single eye minus a stimulus corresponding to the near viewing target by more than a predetermined value.
13. The method of claim 1 , wherein the step of identifying an outlier aberration measurement comprises identifying a measurement of the time sequence of aberration measurements having a first wavefront fit error (WFFE) that exceeds a second WFFE of a second measurement of the time sequence of aberration measurements by more than a predetermined amount.
14. The method of claim 1 , wherein the single eye is subjected to a plurality of viewing conditions comprising a first viewing condition and a second viewing condition, wherein a change from the first to the second viewing condition induces an accommodation of the single eye.
15. The method of claim 14 , wherein:
the first viewing condition comprises viewing a far target and the second viewing condition comprises viewing a near target; and
the step of identifying an outlier aberration measurement comprises identifying pupil radii for the first and second viewing conditions that differ by less than a predetermined amount.
16. The method of claim 1 , further comprising determining statistically-significant component aberrations of the single eye for a plurality of the viewing conditions.
17. The method of claim 16 , further comprising determining a performance of a candidate optical correction for single the eye over a plurality of the viewing conditions by using a merit function that assesses the candidate optical correction relative to the plurality of the viewing conditions.
18. The method of claim 17 , wherein the merit function comprises at least one factor to account for a relative importance of at least one of the plurality of viewing conditions.
19. The method of claim 17 , wherein the step of determining a performance of a candidate optical correction for the single eye comprises assessing the candidate optical correction relative to the plurality of viewing conditions over a portion of the single eye corresponding to a pupil size of the single eye and a pupil location of the single eye for the viewing condition.
20. The method of claim 1 , further comprising:
determining a performance of each of a plurality of candidate optical corrections for the single eye over each of a plurality of viewing conditions; and
determining a prescriptive optical correction for the single eye in response to the determined performances for the candidate optical corrections.