CUSTOMIZED MANUFACTURE OF MOLDS FOR MAKING WAVEFRONT-CUSTOMIZED CONTACT LENS USING A WAVEFRONT ABERROMETER

Abstract

Systems and methods for manufacturing a wavefront-customized contact lens. The systems include: (1) an optical instrument for measuring ocular imperfections of a patient's eye; (2) a computer for designing a mold and pin design used for manufacturing a wavefront-customized contact lens that corrects the ocular imperfections; (3) a fabrication machine for fabricating a wavefront-customized mold that includes corrections for the ocular imperfections; and (4) a manufacturing equipment for manufacturing a wavefront-customized contact lenses that uses the wavefront-customized mold; wherein the wavefront-customized mold design and wavefront-guided contact lens manufacturing are uniquely customized for each patient's eye. The optical means can be a wavefront aberrometer with, or without, a profilometer and/or an Optical Coherence Tomography (OCT) module. The wavefront-customized contact lens can be a soft contact lens or a rigid, gas permeable contact lens.

Claims

1. A system for manufacturing a wavefront-customized contact lens, comprising: an optical instrument operable to measure one or more ocular imperfections, including sphere and cylindrical imperfections, of a patient's eye; a computer operable to design a wavefront-customized mold design that is used for manufacturing a wavefront-customized contact lens that corrects the one or more ocular imperfections; a fabricating machine operable to manufacture a wavefront-customized mold that includes corrections for the one or more ocular imperfections; and a manufacturing machine operable to manufacture a wavefront-customized contact lens that uses the wavefront-customized mold; and wherein the wavefront-customized mold design and the wavefront-guided contact lens manufacturing are uniquely customized for an individual patient's eye.

2. The system of claim 1, wherein wavefront-customization utilizes one or more structural features of the patient's eye chosen from: a shape of a patient's cornea, a sclera, a central curvature, or an asphericity of a patient's cornea, or combinations thereof.

3. The system of claim 1, wherein the optical instrument comprises a wavefront aberrometer.

4. The system of claim 3, wherein the wavefront aberrometer comprises a Shack-Hartmann wavefront sensor.

5. The system of claim 1, wherein the system is configured to measure a shape of a patient's cornea and sclera to customize a back curve of the wavefront-customized contact lens.

6. The system of claim 5, wherein the system is configured to make an impression of the patient's eye to measure a shape of the patient's cornea and sclera.

7. The system of claim 5, wherein the system is configured to measure the shape of the patient's cornea and sclera by using a technique chosen from corneal tomography, Scheimflug, profilometry, or Optical Coherence Tomography (OCT), or combinations thereof.

8. The system of claim 1, wherein the wavefront-customized contact lens comprises a wavefront-customized, soft contact lens.

9. The system of claim 1, wherein the wavefront-customized contact lens comprises a wavefront-customized, rigid gas permeable contact lens.

10. A method of manufacturing a wavefront-customized contact lens, comprising: (1) measuring one or more ocular imperfections of a patient's eye with a wavefront aberrometer; (2) designing a wavefront-customized contact lens comprising a wavefront-guided front surface thickness profile that corrects the one or more ocular imperfections; (3) fabricating a wavefront-customized mold that includes the wavefront-guided front surface thickness profile; and (4) manufacturing one or more wavefront-customized contact lenses via casting or injection molding using the wavefront-customized mold; and wherein the wavefront-customized mold design and the wavefront-customized contact lens manufacturing are uniquely customized for the patient's eye.

11. The method of claim 10, wherein step (1) further comprises measuring refraction and ocular aberrations of the patient's eye with a trial lens fitted on the patient's eye.

12. The method of claim 10, wherein the wavefront-customized contact lens is a soft contact lens.

13. The method of claim 10, wherein the wavefront-customized contact lens comprises a rigid, gas permeable contact lens.

14. The method of claim 10, wherein the wavefront-customized contact lens has a front surface and an opposing back surface; wherein the opposing back surface is molded using casting or injection molding; and wherein the front surface is made by (1) turning on a diamond-tipped, computer-controlled lathe with a fast Z-axis capability, or by (2) 3D printing, or combinations thereof.

15. A method for manufacturing a wavefront-customized contact lens, comprising: (1) identifying a trial contact lens and fitting the trial contact lens on a patient's eye; (2) determining if the trial contact lens is suitable for use; (3) measuring one or more ocular aberrations of the patient's eye through the trial contact lens with a wavefront aberrometer; (4) designing a wavefront-customized front surface thickness profile, based on the one or more ocular aberrations measured in step (3); (5) integrating the wavefront-customized front surface thickness profile from step (4) into a front surface definition of the trial contact lens; (6) manufacturing a wavefront-customized mold based on the wavefront-customized front surface thickness profile from step (5); and (7) manufacturing a wavefront-customized contact lens using the wavefront-customized mold made in step (6).

16. The method of claim 15, wherein step (4) further comprises designing a customized rear surface profile.

17. A method for manufacturing a wavefront-customized contact lens, comprising: (1) providing a trial contact lens to a patient; (2) making dynamic eye measurements of one or more ocular imperfections of a patient's eye with a wavefront aberrometer while wearing a trial contact lens; (3) identifying a pupil center and a pupil radius of the patient's pupil; (4) identifying an iris center and an iris radius of the patient's iris; (5) identifying a trial center, a trial radius, a trial offset, and a trial rotation angle of the trial contact lens; (6) determining an optimal pupil size; (7) performing Modal and Zonal analysis of the one or more ocular imperfections, and generating Zernike polynomials; (8) filtering out outliers and blinks; (9) generating a wavefront-customized front thickness correction map; (10) converting the wavefront-customized thickness correction map into a wavefront-customized contact lens front thickness profile; (11) positioning the wavefront-customized contact lens front thickness profile at the trial offset and the trial rotation angle identified in step (5), and (12) manufacturing a wavefront-customized contact lens.

18. The method of claim 17, wherein step (1) further comprises measuring a refraction and one or more higher-order ocular aberrations of the patient's eye with a trial lens fitted on the patient's eye.

19. A wavefront-customized mold for making a wavefront-customized contact lens, comprising a wavefront-customized front mold comprising: a support ring; and an attached, wavefront-customized interior shape that defines and molds an anterior surface of a wavefront-customized contact lens.

20. A customized pin for making a wavefront-customized contact lens, comprising a customized back pin comprising: a support ring; and an attached, customized exterior shape that defines and molds a posterior surface of a wavefront-customized contact lens.

Description

BRIEF DESCRIPTIONS OF THE DRAWINGS

[0057] FIG. 1 shows a schematic block diagram of a first embodiment of a system for customized manufacture of molds for making wavefront-customized contact lens using a wavefront aberrometer, according to the present disclosure.

[0058] FIG. 2 shows a second embodiment illustrating an example of a process flow chart for using a customized mold in a soft contact lens molding process to make a wavefront-customized soft contact lens, according to the present disclosure.

[0059] FIG. 3 shows a third embodiment illustrating an example of a process flow chart for manufacturing one or more contact lenses via cast or injection molding using a wavefront-customized mold, according to the present disclosure.

[0060] FIG. 4 shows a fourth embodiment illustrating an example of a process flow chart for manufacturing one or more contact lenses via cast or injection molding using a wavefront-customized mold, according to the present disclosure.

[0061] FIG. 5 shows a fifth embodiment illustrating an example of a process flow chart for manufacturing one or more contact lenses via cast or injection molding using a wavefront-customized mold, according to the present disclosure.

[0062] FIG. 6 shows a perspective view of an example of a wavefront-customized mold and wavefront-customized pin for making a wavefront-customized contact lens, according to the present disclosure.

DETAILED DESCRIPTION

[0063] “Residual aberrations” are those aberrations that are left after some attempt has been made to correct them. In the case of the trial lens, we measure through a trial contact lens that has corrections for the patient's lower order aberrations (general sphere or cylinder, or both). This then provides the residual aberrations that we can use to accurately design the customized contact lens. The words “custom contact lens”, “customized contact lens”, and “wavefront-customized contact lens” all mean the same thing.

[0064] FIG. 1 shows a schematic block diagram of a first embodiment of a manufacturing system 1 for manufacturing wavefront-customized molds that are used for making wavefront-customized contact lens using a wavefront aberrometer, according to the present disclosure. Manufacturing system 1 comprises four components: a wavefront aberrometer 2; a computer for designing a wavefront-customized mold 4; a fabrication machine for making a wavefront-customized mold 6; and a manufacturing machine 8 for molding a wavefront-customized contact lens.

[0065] FIG. 2 shows a second embodiment illustrating a method of manufacturing a wavefront-customized soft contact lens, comprising performing the following steps: [0066] Step 10: identifying a soft contact lens from a standard set of off-the-shelf soft contact lenses that are mass-produced by a manufacturer. This baseline lens (e.g., predicate or trial contact lens) is identified with standard clinical practices to meet the overall fit, ocular health, and visual needs of the patient; [0067] Step 12: determining if the trial contact lens is rotationally and translationally suitable (i.e., stable enough) before proceeding to the next step; [0068] Step 14: measuring, with a wavefront sensor in a wavefront aberrometer, the residual uncorrected sphere, cylinder, and higher order aberrations (HOAs) through an off-the-shelf, soft contact lens that is fitted on the eye; [0069] Step 16: defining a wavefront-customized contact lens front and/or rear surface profile that when implemented in a lens would correct for the residual aberrations measured in step 14; [0070] Step 18: integrating the wavefront-customized front surface profile from step 16 into a surface definition of the baseline (trial) soft contact lens used in step 10, thereby defining an integrated, wavefront-customized version of the off-the-shelf, soft contact lens that meets the optical needs of the patient's eye; [0071] Step 20: producing a wavefront-customized mold (or set of molds) with a diamond turned lathe, or by 3-D printing, based on the integrated design generated in step 18; and [0072] Step 22: using the wavefront-customized mold from step 20 in a soft contact lens molding process (that is typically used by the manufacturer) to make a wavefront-customized contact lens.

[0073] Regarding step 18, the real “optical action” takes place at the first (front) surface of the contact lens, given a large difference in refractive index between the contact lens and surrounding media. Customizing the rear surface of the contact lens is primarily done to stabilize the contact lens on the eye, and to correct for residual cylinder errors. The shape of a patient's cornea and sclera can be measured by a number of different techniques, including: corneal topography, profilometry, Scheimflug, and Optical Coherence Tomagraphy (OCT).

[0074] FIG. 3 shows a third embodiment illustrating an example of a method of making a customized contact lens, comprising performing the following steps: [0075] Step 100: Identifying a trial contact lens and fitting contact lens on an eye; Step 102: determining if the trial lens is rotationally and translationally stable enough before proceeding to the next step; [0076] Step 104: measuring the residual uncorrected sphere, cylinder, and higher order aberrations through the trial lens fitted on the eye using a wavefront sensor in a wavefront aberrometer; [0077] Step 106: designing a custom front and/or rear surface profile that corrects for the ocular aberrations measured above; [0078] Step 108: integrating the wavefront-customized front surface profile from above into a surface definition of the trial contact lens used above; [0079] Step 110: producing a wavefront-customized mold based on the integrated design from above; and [0080] Step 112: using the customized mold from above in a soft contact lens molding process to make a customized soft contact lens.

[0081] FIG. 4 shows a fourth embodiment illustrating an example of method of making a customized contact lens, comprising performing the following steps: [0082] Step 200: Measuring one or more ocular imperfections of a patient's eye with a wavefront aberrometer; [0083] Step 202: Designing a contact lens with a front surface profile that corrects for these ocular imperfections; [0084] Step 204: Fabricating a wavefront-customized contact lens mold that includes the wavefront customized front surface profile; and [0085] Step 206: Manufacturing one or more contact lenses via cast or injection molding using said wavefront-customized mold.

[0086] FIG. 5 shows a fifth embodiment illustrating an example of method of making a customized contact lens, comprising performing the following steps: [0087] Step 300: Make dynamic eye measurement with a wavefront aberrometer while wearing an off-the-shelf trial contact lens; [0088] Step 302: Determine optimal pupil size; [0089] Step 304: Perform Modal & Zonal methods to generate Zernike polynomials; [0090] Step 306: Filter outliers (e.g., blinks, etc.); [0091] Step 308: Generate wavefront-customized thickness correction map & convert to contact lens thickness profile; [0092] Step 310: Identify Pupil center and radius; [0093] Step 312: Identify Iris center and radius; [0094] Step 314: Identify trial contact lens center and radius using edge and existing fiducials; and [0095] Step 316: Position the wavefront-guided front thickness profile to the properly identified offset and rotation angle, and then make a wavefront-customized contact lens.

[0096] FIG. 6 shows an example of a wavefront-customized mold 400 and wavefront-customized pin 410 for making a wavefront-customized contact lens. Contact lenses have a front surface and a back surface, which may have different shapes. The wavefront-customized mold 400 comprises a support ring 401 (which may be, for example, a circular ring) with a curved, dome-shaped, interior shape 402 that defines and molds an anterior (front) surface 402 of the wavefront-customized contact lens (not shown). In some embodiments, mold 400 has an alignment feature 403 to facilitate accurate rotational alignment to pin 404. Customized pin 410 comprises a circular support ring 404 (which may be, for example, a circular ring) with a curved, dome-shaped, exterior surface 405 that defines and molds a posterior (back) surface of the wavefront-customized contact lens. To manufacture a wavefront-customized contact lens, mold 400 is usually inverted and filled with the contact lens material in liquid form. This may be chosen from any number of materials including: etafilcon, polymacon, hioxifilcon, or tetrafilcon, or other contact lens materials, or combinations thereof. Mold 400 and pin 410 are partially-assembled during manufacturing and then the liquid contact lens material is placed in mold 400. Mold 400 and pin 410 are then assembled together such that the space between these two molds is completely filled with the liquid lens material. A final curing step results in solidifying the liquid contact lens material. This curing step may be done thermally or with UV curing, or both. Customizing the rear surface of the contact lens is primarily done to stabilize the contact lens on the eye, and to correct for residual cylinder errors. The shape of a patient's cornea and sclera can be measured by a number of different techniques, including: corneal topography, profilometry, Scheimflug, and Optical Coherence Tomagraphy (OCT). In some embodiments, pin 410 may have a wavefront-customized shape.

[0097] The methods and systems described herein have several useful features. It ties in with mass manufacturing molded lens technology to provide for highly repeatable, comfortable contact lenses. It also facilitates the manufacture, at very low cost, of many contacts lenses from a single mold. Thus, a year's supply (365+ days) of contacts can be made from a single production run. A fully-customized lens that is wavefront corrected can be made from a daily wear contact lens. This has advantages for the patient in that (1) these lenses will be less prone to infection and debris, (2) they do not require any cleaning, and (3) it simplifies patient compliance. The manufacture of molds (including pins) can be separated from the manufacture of wavefront-customized contact lens. This allows the designer that designs the wavefront-customized contact lens mold to be physically separated from the lens manufacturer.

[0098] In some embodiments of a manufacturing system 1, the mold design is based on an existing mold design. In other embodiments of a manufacturing system 1, one element in a mold set is a wavefront-customized element, where the other mold set elements are selected from a standardized stock.

[0099] In some embodiments, the method of manufacture can comprise a hybrid approach where the back surface of a wavefront-customized contact lens is molded using casting or injection molding, and the front surface of the wavefront-customized contact lens is turned on a diamond-tipped, computer-controlled lathe with fast Z-axis capability, or formed by 3-D printing.