# US 2014/0192327 A1 · Prosthetic Lenses and Methods of Making the Same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192327 A1 - Document ID: US20140192327A1 - Status: Published application - Kind: A1 - Application number: 14/187,036 - Filed: 2014-02-21 - Published: 2014-07-10 - Earliest claimed: 2012-12-21 - Assignees: EyePrint Prosthetics LLC - Applicants: EyePrint Prosthetics LLC - Inventors: Christine W. Sindt; Keith D. Parker - Web page: https://patentgrep.com/patent/US20140192327A1 ## CPC - G02C 7/049: {Contact lenses having special fitting or structural features achieved by special materials or material structures} - A61B 3/107: for determining the shape or measuring the curvature of the cornea - B29D 11/00105: {covering a large part of the cornea} - B29D 11/00125: {Auxiliary operations, e.g. removing oxygen from the mould, conveying moulds from a storage to the production line in an inert atmosphere} - G02C 7/047: {Contact lens fitting; Contact lenses for orthokeratology; Contact lenses for specially shaped corneae} - A61F 2240/004: Using a positive or negative model, e.g. moulds - G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00) - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00) - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) ## Abstract A method of obtaining an impression of an eye, the method comprises preparing an impression material, contacting the impression material with an eye of a subject, obtaining an impression of the eye on the impression material, creating an indication of the orientation of the impression with respect to the eye, and removing the impression material from the eye. The impression can be used in a method of manufacturing a lens for an eye that comprises receiving one or more data files comprising a back lens surface calculation and a front lens surface calculation, forming a back lens surface from a lens blank based on the back lens surface calculation, forming a front lens surface from the lens blank based on the front lens surface calculation, and forming one or more asymmetric features in the back lens surface based on the back lens surface calculation. ## Claims ### Claim 1 A method of obtaining an impression of an eye, the method comprising: preparing an impression material; contacting the impression material with an eye of a subject; obtaining an impression of the eye on the impression material; creating an indication of the orientation of the impression with respect to the eye; and removing the impression material from the eye. ### Claim 2 (depends on 1) The method of claim 1, further comprising placing the impression material in a bowl of a tray, wherein contacting the impression material with the eye comprises contacting the impression material with the eye when the impression material is disposed within the bowl. ### Claim 3 (depends on 2) The method of claim 2, further comprising letting the impression material set for a first time period in the bowl prior to contacting the impression material with the eye. ### Claim 4 (depends on 2) The method of claim 2, further comprising aligning the bowl with a predetermined orientation on the eye using an alignment structure. ### Claim 5 (depends on 1) The method of claim 1, wherein the impression material comprises a multi-component mixture. ### Claim 6 (depends on 1) The method of claim 1, wherein the impression material comprises a vinyl polysiloxane. ### Claim 7 (depends on 1) The method of claim 1, further comprising creating a negative impression of the eye with the impression material. ### Claim 8 A tray for taking an impression of an eye, the tray comprising: a handle; a bowl; and an alignment structure disposed on at least one of the handle or the bowl, wherein the alignment structure is configured to indicate a relative positioning of the bowl with respect to the eye. ### Claim 9 (depends on 8) The tray of claim 8, wherein the bowl comprises a side wall defining a conical interior volume. ### Claim 10 (depends on 8) The tray of claim 8, wherein the alignment structure comprises a flat surface disposed on an exterior surface of the handle. ### Claim 11 (depends on 8) The tray of claim 8, wherein the alignment mechanism comprises a passage at least partially through the bowl. ### Claim 12 (depends on 8) The tray of claim 8, wherein the alignment mechanism is configured to imprint a mark on an impression material disposed within the bowl. ### Claim 13 (depends on 8) The tray of claim 8, wherein the bowl has a diameter between about 18 millimeter (mm) and about 28 mm. ### Claim 14 A method of determining a lens design, the method comprising: identifying a limbal circle within a scanned impression of an eye; determining an optic zone within the limbal circle; determining a transition zone adjacent to the optic zone; determining a landing zone adjacent to the transition zone; determining an edge lift zone adjacent to the landing zone; and computing a back lens surface of a lens based on the optic zone, the transition zone, the landing zone, and the edge lift zone. ### Claim 15 (depends on 14) The method of claim 14, further comprising: scanning a negative impression of an eye in three dimensions; and generating the scanned impression of the eye based on the scanning. ### Claim 16 (depends on 14) The method of claim 14, further comprising determining a spindle axis of the lens based on identifying the limbal circle. ### Claim 17 (depends on 16) The method of claim 16, further comprising determining an optical axis of the lens, wherein the optical axis is not aligned with the spindle axis of the lens. ### Claim 18 (depends on 14) The method of claim 14, further comprising: computing a distance between the back lens surface and a surface of the eye as represented by the scanned impression of the eye; and generating a warning when the distance is outside of a predetermined clearance threshold. ### Claim 19 (depends on 14) The method of claim 14, further comprising modifying the back lens surface based on one or more bumps identified in the scanned impression of the eye. ### Claim 20 (depends on 19) The method of claim 19, further comprising: creating a bump zone to account for the one or more bumps; and smoothing the bump zone. ### Claim 21 (depends on 14) The method of claim 14, further comprising computing a front lens surface of the lens. ### Claim 22 (depends on 21) The method of claim 21, further comprising fabricating the lens based on the back lens surface and the front lens surface. ### Claim 23 A method of manufacturing a lens for an eye, the method comprising: receiving one or more data files comprising a back lens surface calculation and a front lens surface calculation; forming a back lens surface from a lens blank based on the back lens surface calculation; forming a front lens surface from the lens blank based on the front lens surface calculation; and forming one or more asymmetric features in the back lens surface based on the back lens surface calculation. ### Claim 24 (depends on 23) The method of claim 23, further comprising: polishing the lens after milling the back lens surface; milling the front lens surface; and milling the one or more asymmetric features in the back lens surface. ### Claim 25 (depends on 23) The method of claim 23, wherein the one or more asymmetric features in the back lens surface comprise an asymmetric landing surface configured to touch a sclera of the eye. ### Claim 26 (depends on 23) The method of claim 23, wherein the one or more asymmetric features in the back lens surface comprise one or more bump zone configured to provide clearance for one or more bumps identified on a surface of the eye. ### Claim 27 A lens for an eye, the lens comprising: a front lens surface; and a back lens surface, wherein the front lens surface and the back lens surface define an interior lens volume, and wherein the lens is not symmetric about a central axis passing through the front lens surface and the back lens surface. ### Claim 28 (depends on 27) The lens of claim 27, wherein the lens comprises a scleral cover shell. ### Claim 29 (depends on 27) The lens of claim 27, wherein the back lens surface comprises: a central optic zone; a transition zone disposed about the central optic zone; a landing zone disposed about the transition zone; and an edge lift zone disposed about the landing zone. ### Claim 30 (depends on 29) The lens of claim 29, wherein the central optic zone of the back lens surface comprises a spherical cap shape. ### Claim 31 (depends on 29) The lens of claim 29, wherein the lens is configured to provide a clearance of between about 100 microns and 500 microns from an outer eye surface in the central optic zone of the back lens surface during use. ### Claim 32 (depends on 29) The lens of claim 29, wherein the transition zone of the back lens surface has a width of about 2 millimeter. ### Claim 33 (depends on 29) The lens of claim 29, wherein the lens is configured to provide a clearance of at least about 100 microns from an outer surface of a cornea of the eye in the transition zone of the back lens surface during use. ### Claim 34 (depends on 29) The lens of claim 29, wherein the lens is configured to contact an outer eye surface in the landing zone of the back lens surface during use. ### Claim 35 (depends on 29) The lens of claim 29, wherein the lens is configured to provide a clearance of between about 5 microns and 50 microns from an outer eye surface in the edge lift zone of the back lens surface during use. ### Claim 36 (depends on 27) The lens of claim 27, wherein the lens comprises a gas permeable material. ### Claim 37 (depends on 27) The lens of claim 27, wherein the lens comprises a multi-focal lens portion. ### Claim 38 (depends on 27) The lens of claim 27, wherein the lens comprises an independent elevation specific design. ### Claim 39 A device comprising: a lens configured to be disposed on an eye, wherein the lens comprises: a front lens surface; a back lens surface, and an optical axis; wherein the optical axis is not aligned with a corneal apical axis of the eye. ### Claim 40 (depends on 39) The device of claim 39, wherein the lens comprises a scleral cover shell. ### Claim 41 (depends on 39) The device of claim 39, wherein the lens comprises a decentered optical design. ### Claim 42 (depends on 39) The device of claim 39, wherein the lens comprises a multi-focal lens portion. ### Claim 43 (depends on 39) The device of claim 39, wherein the lens comprises an independent elevation specific design. ### Claim 44 An optical device comprising: a lens configured to be disposed in an eye, wherein the lens is configured to contact a sclera of the eye and have a clearance above a cornea of the eye when disposed in the eye, wherein the lens comprises a back surface, wherein the back surface comprises at least one non-symmetrical feature that is configured to engage a corresponding feature on the eye, and wherein the lens is configured to be rotationally stable in use based on the at least one non-symmetrical feature on the back surface of the lens. ### Claim 45 (depends on 44) The device of claim 44, wherein the lens comprises a non-uniform thickness that creates a weighted prismatic effect within an optic zone portion, and wherein the non-uniform thickness is configured to maintain a heaviest weighted portion at a position other than downwards when worn on the eye. ### Claim 46 (depends on 45) The device of claim 45, wherein the heaviest weighted portion comprises a prism, a correction for astigmatism, a multi-focal lens portion, a correction for a high order aberration, or any combination thereof. ### Claim 47 (depends on 44) The device of claim 44, wherein the corresponding feature on the eye comprises a protrusion or a deformation, and wherein the at least one non-symmetrical feature on the back surface of the lens comprises a bump zone configured to provide a clearance from the back surface of the lens to the protrusion or the deformation. ### Claim 48 (depends on 44) The device of claim 44, wherein the at least one non-symmetrical feature on the back surface of the lens comprises non-symmetric contour configured to follow a contour of the sclera of the eye. ### Claim 49 A method comprising: disposing a lens in an eye, wherein the lens comprises a back surface, and wherein the back surface comprises at least one non-symmetrical feature; contacting a landing zone portion of the lens with a sclera of the eye; and aligning the at least one non-symmetrical feature of the lens with a corresponding surface feature of the eye, wherein the lens resists a rotational force based on the alignment of the at least one non-symmetrical feature of the lens with the corresponding surface feature of the eye. ### Claim 50 (depends on 49) The method of claim 49, further comprising: retaining a weighted portion of the lens in a non-downward position based on the alignment of the at least one non-symmetrical feature of the lens with the corresponding surface feature of the eye. ### Claim 51 (depends on 49) The method of claim 49, wherein the at least one non-symmetrical feature of the lens comprises a bump zone on the back surface of the lens, wherein the corresponding surface feature of the eye comprises a bump or a deformation of the eye, and wherein aligning the at least one non-symmetrical feature of the lens with a corresponding surface feature of the eye comprises: aligning the bump zone with the bump or the deformation of the eye; and providing clearance above the bump or deformation of the eye based on the alignment of the bump zone with the bump or the deformation. ### Claim 52 (depends on 49) The method of claim 49, wherein the lens further comprises a marking, and wherein the method further comprises: aligning the marking with a predetermined position on the eye, and wherein disposing the lens in the eye comprises disposing the lens in the eye with the marking approximately aligned with the predetermined position on the eye. ### Claim 53 A method of designing a lens, the method comprising: scanning a plurality of impressions of a plurality of eyes to create a plurality of eye scan files; storing the plurality of eye scan files in a database; analyzing the plurality of eye scan files to determine one or more average parameters of the plurality of eyes, wherein the one or more average parameters comprise at least one non-symmetric feature of the eye; and designing a lens design using the one or more average parameters of the plurality of eyes. ### Claim 54 (depends on 53) The method of claim 53, wherein the lens design comprises a front lens surface design and a back lens surface design. ### Claim 55 (depends on 54) The method of claim 54, wherein the back lens surface design comprises the at least one non-symmetric feature of the eye. ### Claim 56 (depends on 53) The method of claim 53, wherein the at least one non-symmetric feature comprises an average scleral shape of the plurality of eyes. ### Claim 57 (depends on 53) The method of claim 53, further comprising: manufacturing a plurality of the lenses using the lens design.