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US 2025/0143564 A1Published application
Methods of designing and fabricating a customized wavefront guided contact lens
AssigneeWaveFront Dynamics, Inc.
InventorsDaniel R. Neal, Xifeng Xiao
Life of this patent
Estimating the term…
Abstract
This disclosure relates to methods and devices for designing customized contact lenses, by initially making dynamic wavefront sensor measurements through a trial contact lens that is fitted on an eye, and then calculating a WaveFront Guided (WFG) correction to be applied to the trial contact lens that reduces the RMS level of aberrations as much as practically possible. The output of the wavefront correction program is a customized lathe file that the manufacturer can use to make customized contact lenses on a lathe. The method works best for soft contact lenses and scleral lenses.
Claims20
A method, comprising:
- placing a trial contact lens on a patient's eye;
- dynamically measuring, with an aberrometer, a time sequence of (a) a pair of (x,y) offset coordinates and (b) a rotation angle of the trial contact lens while on the patient's eye;
- dynamically measuring one or more wavefront aberrations of the patient's eye through the trial contact lens and determining a wavefront corrected surface profile;
- incorporating the wavefront corrected surface profile into a front surface shape of a base contact lens;
- and
- fabricating a customized wavefront guided (WFG) contact lens using the wavefront correction surface profile.
3 more elements
A method, comprising:
- (a) defining a front surface, F(xi,yi), and a back surface B(xi,yi) of a trial contact lens;
- (b) placing the trial contact lens on a patient's eye;
- (b) measuring, with an aberrometer, a refraction and one or more higher order aberrations of the patient's eye while wearing the trial contact lens;
- (c) determining a pair of (x,y) coordinate misalignments and a rotation angle of the trial contact lens while on the patient's eye;
- (d) calculating a plurality of Zernike polynomial coefficients, Zxy, from the one or more higher order aberrations;
- (e) using one or more Zernike polynomials to determine residual values of Seq, S, C, and A, wherein Seq=Sphere Equivalent, S=sphere, C=cylinder, and A=axis;
- (f) generating a wavefront guided (WFG) corrected contact lens surface profile, Wc(x,y);
- (g) defining a radial Transition Zone, T(r), according to Eq. 1 as follows:
- T
-
- (
- r
- )
- =
- {
- {
- 1
- ,
- r
- <
- r
- 0
- 1
- -
- cos
-
- π
-
- (
- r
- -
- r
- 0
- r
- 1
- -
- r
- 0
- )
- ,
- r
- 0
- >
- r
- ≥
- r
- 1
- 0
- ,
- r
- ≥
- r
- 1
- Eq
- .
- (
- 1
- )
- (h) defining a Wavefront Correction Function, Wc(x,y), according to Eq. 2 as follows:
- W
- c
- (
- x
- ,
- y
- )
- =
- T
-
- (
- r
- )
- [
- -
- ∑
- n
-
- C
- n
- d
-
- Z
- n
- (
- x
- -
- x
- d
- ,
- y
- -
- y
- d
- )
- ]
- +
- (
- 1
- -
- T
-
- (
- r
- )
- )
-
- F
- b
- (
- x
- -
- x
- d
- ,
- y
- -
- y
- d
- )
- .
- Eq
- .
- (
- 2
- )
- (i) calculating a WFG corrected surface profile using the following filters, comprising;
- (i) scaling each Zernike polynomial coefficient, Zxy, to a standard size;
- (ii) deleting any Zernike polynomial coefficient(s) that are not significant in terms of error;
- (iii) averaging the remaining Zernike polynomial coefficients over a set of measurements, Pti;
- (iv) rescaling the remaining Zernike polynomial coefficients to the largest pupil measured in the set of measurements, Pti;
- and
- (v) determining limits, r0 and r1, of the Transition Zone;
- (j) evaluating the analytic surface Wc(x,y) at every point, i, in the Front Curve Points File, F(xi,yi), according to Eq. 3 as follows:
- F
- f
- (
- x
- ,
- y
- )
- =
- B
- (
- x
- ,
- y
- )
- +
- Wc
-
- (
- (
- x
- i
- -
- x
- d
- )
-
- cos
-
- (
- -
- α
- d
- )
- ,
- (
- y
- i
- -
- y
- d
- )
-
- sin
-
- (
- -
- α
- d
- )
- )
- ;
- Eq
- .
- (
- 3
- )
- and
- (k) adjusting the locations of fiducial marks on the WFG contact lens to make them horizontal;
- and
- (l) manufacturing a customized WFG contact lens.
190 more elements
A method, comprising:
- placing a trial contact lens on a patient's eye;
- dynamically measuring, with an aberrometer, a pair of (x,y) offset coordinates and a rotation angle of the trial contact lens while on the patient's eye;
- dynamically measuring one or more wavefront aberrations of the patient's eye through the trial contact lens and determining a wavefront corrected surface profile;
- integrating the wavefront corrected surface profile into a front surface shape of a base contact lens;
- fabricating a customized wavefront guided (WFG) contact lens using the wavefront correction surface profile;
- placing the fabricated customized WFG contact lens on the patient's eye;
- determining, with the aberrometer, an effectiveness of the customized WFG contact lens on the patient's eye by dynamically measuring a residual amount of new wavefront errors;
- and
- determining a stability of the customized WFG contact lens on the patient's eye by dynamically measuring and analyzing one or more temporal sequences of (a) shifts in the pair of (x,y) offset coordinates and (b) shifts in the rotational angle relative to a pupil center or an iris center.
6 more elements
Dependencies are inferred from the claim text.