WO2007140220A2 - Mesure de lentilles et de moules pour lentilles à l'aide de la tomographie par cohérence optique - Google Patents

Mesure de lentilles et de moules pour lentilles à l'aide de la tomographie par cohérence optique Download PDF

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Publication number
WO2007140220A2
WO2007140220A2 PCT/US2007/069588 US2007069588W WO2007140220A2 WO 2007140220 A2 WO2007140220 A2 WO 2007140220A2 US 2007069588 W US2007069588 W US 2007069588W WO 2007140220 A2 WO2007140220 A2 WO 2007140220A2
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WIPO (PCT)
Prior art keywords
lens
lenses
contact
imaged
image
Prior art date
Application number
PCT/US2007/069588
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English (en)
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WO2007140220A3 (fr
Inventor
Jianping Wei
Arthur Back
Original Assignee
Coopervision International Holding Company, Lp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US11/752,202 external-priority patent/US7416300B2/en
Application filed by Coopervision International Holding Company, Lp filed Critical Coopervision International Holding Company, Lp
Priority to CN2007800192781A priority Critical patent/CN101454708B/zh
Priority to AU2007267643A priority patent/AU2007267643A1/en
Publication of WO2007140220A2 publication Critical patent/WO2007140220A2/fr
Publication of WO2007140220A3 publication Critical patent/WO2007140220A3/fr
Priority to HK09108401.7A priority patent/HK1129466A1/xx

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/2441—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures using interferometry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties
    • G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties
    • G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
    • G01M11/025—Testing optical properties by measuring geometrical properties or aberrations by determining the shape of the object to be tested

Definitions

  • the present invention relates to measuring features of lenses and/or lens molds. More particularly, the invention relates to metrology methods, design methods, and manufacturing methods for lenses, including vision correcting lenses, such as contact lenses, using optical coherence tomography.
  • Measuring physical features of lenses is important for determining appropriate design and manufacturing aspects of lenses. This importance is particularly significant in the design and manufacture of vision correcting lenses, such as contact lenses, intraocular lenses, corneal onlay lenses, corneal inlay lenses, and spectacle lenses, where the lenses are produced to correct or enhance a patient's vision.
  • vision correcting lenses such as contact lenses, intraocular lenses, corneal onlay lenses, corneal inlay lenses, and spectacle lenses, where the lenses are produced to correct or enhance a patient's vision.
  • lens typically, when vision correcting lenses, such as contact lenses, are being measured, it is necessary to physically section or cut the lens. For example, to examine a thickness profile of a contact lens, it is necessary to cut the lens along one or more meridians and then obtain an image of the cross-section of the lens. Frequently, the sectioning of the lens is only performed along a single meridian and therefore, in order to obtain an accurate thickness profile map of the contact lens, it is necessary to cut many individual lenses from among a batch of lenses.
  • the curvature is estimated by placing the lens on a planar surface so that the physical distance from the lens edge to the highest point of the lens can be measured to determine the sagittal height of the lens. The sagittal height can then be used to estimate the curvature of the lens.
  • a method may be useful in determining the curvature of a spherical lens, the method becomes less accurate as non-spherical lenses are being examined.
  • Another method of estimating lens curvature includes the use of a keratometer. For example, a keratometer can be used to estimate lens curvature by measuring two reflected images reflected from the back surface of the lens.
  • the present methods attempt to address this and other needs.
  • the present methods use one or more optical coherence tomography (OCT) systems to provide one or more images of a lens or a mold from which a lens can be obtained.
  • OCT systems can be used to image lenses in lens metrology methods, lens design methods, and lens manufacturing methods. Not only can the OCT system be used in lens metrology methods to measure one or more features of the lens being imaged, but the OCT system can be used as a quality control component of a lens manufacturing system.
  • the OCT system can be used to provide images of a variety of lenses, including vision correcting lenses, such as contact lenses, intraocular lenses, corneal onlay lenses, corneal inlay lenses, and spectacle lenses.
  • the images can be examined to determine one or more features of the lens, such as lens curvature, lens shape, lens thickness, lens edge design, and the like.
  • the present methods permit one or more lenses to be measured, designed, or produced without physically cutting the lenses and by accurately determining the surface shape of the lens for both spherical and non-spherical lenses.
  • FIG. 1 is an illustration of a section view of a contact lens imaged in vitro using an
  • FIG. 2 is an illustration of an example of a pseudo-colored surface view of a contact lens.
  • FIG. 3 is an illustration of a section view of a contact lens imaged in vivo using an
  • FIG. 4 is an illustration of meridians of a contact lens.
  • FIG. 5 is an illustration of an example of a surface view of a contact lens.
  • the present methods permit the measurement of one or more lenses without cutting the lenses or contacting the lenses with an examining device or instrument.
  • lens features such as lens thicknesses and lens surface shapes among other things, can be determined.
  • OCT optical coherence tomography
  • OCT is a known biological tissue optical scanning technique that produces high resolution cross sectional images of optical reflectivity.
  • OCT is based on the principle of using a low-coherence interferometer (Michelson interferometer) where distance information concerning various biological structures is extracted from the time delays of the reflected signals.
  • OCT systems are able to provide images of biological tissue with a micrometer resolution.
  • an OCT system can utilize a broadband superluminescent diode (SLD) as a light source to emit light.
  • the emitted light can be directed to an interferometer, such as a conventional Michelson interferometer.
  • Two beams of light can be obtained from the emitted light using a beam splitter.
  • One beam is understood to be a sample beam.
  • the sample beam is typically focused on the item being imaged.
  • the second beam can be understood to be a reference beam.
  • the reference beam is directed to a mirror.
  • the sample bean penetrates the material being imaged and can then be reflected or scattered backward as it interacts with materials or portions of materials that have different reflective indices.
  • a detector device combines the back-reflected light from the sample path and the reflected light of the reference beam. When the optical path difference between the sample path reflection beam and the reference path reflection beam is within the coherence length of the light source, interference occurs.
  • the Visante OCT system has been developed and is described for imaging the anterior chamber of an eye. It uses a 1300 nm wavelength light source to provide a desired penetration through the sclera and iris of an eye with minimal scattering.
  • These publicly available OCT systems function in a time domain, and have axial resolutions of about 3 micrometers, and transverse resolutions from about 15-20 micrometers. Such systems can produce a single image consisting of about 600 A-scans in about 4 seconds.
  • Another OCT system has been described which has improved sensitivity relative to time domain OCT systems, and has shorter acquisition times relative to existing systems. These OCT systems are referred to as spectral optical coherence tomography (SOCT) systems. SOCT systems can produce three-dimensional images in real time. The high speed imaging associated with SOCT systems can help reduce motion artifacts that may be present.
  • SOCT spectral optical coherence tomography
  • a lens refers to a device other than the lens of the eye or the cornea of the eye.
  • a lens can be a vision correcting lens, or a lens of an optical instrument or device, or a lens of a diagnostic instrument or device.
  • a metrological method for a lens comprises imaging a lens using an OCT system to obtain at least one image of the lens.
  • the lens is selected from the group consisting of vision correcting lenses, optical instrument lenses, diagnostic instrument lenses, and combinations thereof.
  • the OCT systems can be also be used in the design of lenses and/or in the manufacture of lenses.
  • the present invention also relates to methods of designing lenses and methods of manufacturing lenses.
  • another embodiment of the present invention includes a method of designing a lens that comprises examining information obtained from at least one image of a first lens imaged with an OCT system, and designing a second lens using the examined information of the first lens.
  • a method of manufacturing a lens comprises examining information obtained from at least one image of a lens imaged with an OCT system during the manufacture of the lens, and controlling the quality of lenses produced using the examined information of the lens.
  • the use of the OCT system can help with quality control of lenses produced during a manufacturing process.
  • the use of the OCT system can be understood, at least in certain embodiments, to provide an "in line" quality control of the lenses, including contact lenses. For example, by including one or more OCT imaging stations in a lens manufacturing line, lenses, such as contact lenses, can be produced and inspected for appropriate features, such as thickness profiles, powers, curvatures, and the like, without substantial down time or delays in the manufacturing process.
  • Embodiments of the present methods which include an OCT system as a quality control component or in a quality control station, can include a step of accepting or rejecting an imaged lens, or a batch of lenses based on images obtained by the OCT system.
  • methods can include a step of classifying the imaged lens or a batch of lenses corresponding to the imaged lenses into one or more categories. For example, if a lens of a batch of lenses is imaged using an OCT system, as described herein, and is determined to have a different optical power than originally intended, that batch of lenses could be classified into a category of lenses having that same optical power, as opposed to the intended optical power, and still be used without being rejected.
  • the use of OCT images can be helpful in increasing the yield rate of acceptable lenses being manufactured compared to yield rates of lenses obtained from manufacturing lines that do not include an OCT imaging component.
  • the yield rate for clinically acceptable contact lenses using the present methods can be greater than 95% for pre-extracted or pre-hydrated contact lenses, can be greater than 80% for hydrated non-silicone hydrogel contact lenses, and can be greater than 20% for silicone hydrogel contact lenses.
  • yield rates of clinically acceptable hydrated silicone hydrogel contact lenses can be greater than 40%, greater than 50%, greater than 60%, greater than 70%, greater than 80%, or greater than 90%.
  • the present methods use one or more OCT systems to produce one or more images of one or more lenses or lens molds from which lenses are obtained.
  • the lens images can then be examined to measure one or more features of the lenses, such as physical features, optical features, and the like.
  • the OCT systems can be conventional OCT systems, such as the publicly available OCT systems described herein, or the OCT system can be a SOCT system, as described above.
  • the OCT system or systems can be used to provide images of a variety of different lenses.
  • certain methods may use the OCT system to image a vision correcting lens or an ocular refractive correction device.
  • lenses that can be imaged with the OCT systems include, without limitation, contact lenses, intraocular lenses, corneal onlay lenses, corneal inlay lenses, and spectacle lenses.
  • the lens used in the present methods is a contact lens.
  • the present contact lenses can be understood to be hydrogel lenses, or lenses that are water swellable or lenses that are swollen with water.
  • Some hydrogel lenses may be free of silicon, for example, poly(2-hydroxyethyl methacrylate) (polyHEMA)-based lenses, as understood by persons of ordinary skill in the art.
  • Other hydrogel lenses may include a silicon-containing component or a silicone-containing component, for example, the present contact lenses may be silicone hydrogel contact lenses.
  • silicone hydrogel materials useful in the present contact lenses include materials having a US Adopted Name (USAN) of Lotrafilcon (such as Lotrafilcon A; Ciba Vision), Balafilcon (such as Balafilcon A; Bausch & Lomb), Galyfilcon (such as Galyfilcon A; Vistakon), or Comfilcon (such as Comfilcon A; CooperVision). Additional examples of suitable materials used to make contact lenses include, without limitation, etafilcon A, genfilcon A, senofilcon A, lenefilcon A, lotrifilcon B, or polymacon. [0030]
  • the contact lenses imaged using the present methods can be spheric contact lenses or aspheric contact lenses.
  • the contact lenses can be a lens selected from the group consisting of monofocal contact lenses, multifocal contact lenses (including bifocal contact lenses), toric contact lenses, and combinations thereof.
  • the contact lenses imaged with the present methods include wavefront aberration correcting or reducing contact lenses.
  • the present methods use one or more OCT systems to provide or obtain images of lenses, including vision correcting lenses, such as contact lenses.
  • the lenses, or the images of the lenses can be analyzed to measure one or more features of the lenses.
  • embodiments of the present methods can be understood to be lens metrology methods, and in embodiments in which the lens is a vision correcting lens, such as a contact lens, embodiments of the present methods can be understood to be contact lens metrology methods.
  • the use of the OCT systems and images obtained therefrom can be used in the design of lenses, such as contact lenses.
  • embodiments of the present methods can be understood to be methods of designing lenses, or methods of designing contact lenses.
  • the OCT systems and images obtained therefrom can be used in the manufacture of lenses, such as contact lenses.
  • embodiments of the present methods can be understood to be methods of manufacturing lenses or methods of manufacturing contact lenses.
  • the lens is a vision correcting lens and the lens is imaged using the OCT system(s) when the lens is not in contact with an eye of an individual, such as a person.
  • the vision correcting lens can be imaged with an OCT system while the lens is not in contact with a portion of a person's eye, such as the cornea of the eye.
  • Being able to image vision correcting lenses, such as contact lenses or other soft flexible lenses, while they are not in contact with a person's eye enables certain features of the lenses to be measured or determined that otherwise could not be accurately determined due to the interaction of the eye with the lens.
  • a lens such as a contact lens
  • OCT optical coherence tomography
  • embodiments of the present methods can image lenses that are not in contact with the eye
  • other embodiments may permit imaging of a vision correcting lens when in contact with an eye of an individual.
  • methods of designing vision correcting lenses, such as contact lenses can comprise imaging the lens using an OCT system while the lens is in contact with an eye of a person, or a portion of the eye.
  • methods of manufacturing vision correcting lenses, such as contact lenses can comprise imaging the lens using an OCT system while the lens is in contact with an eye of a person, or a portion of the eye.
  • Such methods can include additional steps, as discussed herein, which are not present when examining contact lenses with an OCT system for lens fit on an eye.
  • the OCT system can be used to measure other lenses, such as corneal onlay lenses (i.e., lenses structured for placement between a corneal epithelium and Bowman's membrane of an eye) and corneal inlay lenses (i.e., lenses structured for placement within the stroma of an eye), while such other lenses are in contact with a portion of an eye.
  • corneal onlay lenses i.e., lenses structured for placement between a corneal epithelium and Bowman's membrane of an eye
  • corneal inlay lenses i.e., lenses structured for placement within the stroma of an eye
  • the lens can be imaged in a container.
  • the lens can be imaged in a container that has at least one substantially or completely transparent sidewall to permit imaging of the lens located therein by the OCT system, hi further embodiments, the lens may be placed in a volume of liquid located in the container.
  • the lens may be located in an aqueous liquid, such as water, including deionized water, or a buffered solution, such as a buffered saline solution.
  • the container may be sealed or may have an opening, hi certain embodiments, a contact lens is imaged in a volume of water located in a cuvette.
  • the present methods can be practiced to image a lens, such as a contact lens, in a hydrated state, such as a lens that is partially swollen or completely swollen with water
  • the present methods can also be practiced to image unhydrated lenses.
  • methods may comprise imaging a lens, such as a contact lens, using an OCT system, wherein the lens has not been hydrated or has been dehydrated.
  • a contact lens may be imaged with an OCT system after a demolding procedure, for example when the contact lens is in contact with one mold member of a lens mold; after a delensing procedure, for example, when a contact lens has been separated from a mold member; after an extraction procedure and before hydration with water; and/or after a hydration procedure and a dehydration procedure to dehydrate the hydrated lens.
  • the OCT systems used in the present methods provide at least one image of a lens, hi certain embodiments, including lens metrology methods, lens design methods, and lens manufacturing methods, the at least one image can be selected from the group consisting of lens surface images, lens section images, and combinations thereof.
  • the image may be an anterior lens surface image, a posterior lens surface image, or both.
  • the present metrology methods are able to provide measurement of one or more features of a lens, such as a contact lens, without cutting the lens and without contacting the lens.
  • the "natural" physical and/or optical features of the lens can be determined and evaluated prior to use of the lens by an individual.
  • the methods may also comprise determining a lens feature of the lens being imaged.
  • methods may comprise determining a lens feature selected from the group consisting of lens thickness, lens shape, lens curvature, lens power, lens edge profile, and combinations thereof.
  • the method may comprise determining a lens feature selected from the group consisting of a thickness profile of the lens, a back surface shape of the lens, a front surface shape of the lens, and combinations thereof. The determining can include one or more steps of measuring one or more of such features from one or more images of the imaged lenses.
  • the OCT system can be used to provide one or more images, such as computerized or digital images of a lens, such as a contact lens, and the resulting images can be examined, either manually by a person or automatically using a machine, to determine one or more of the features described above.
  • images such as computerized or digital images of a lens, such as a contact lens
  • a method including a lens metrology method, comprises determining a lens thickness profile of the lens along a meridian of the lens selected from the group consisting of the 0 degree meridian, the 30 degree meridian, the 45 degree meridian, the 90 degree meridian, the 135 degree meridian, the 150 degree meridian, the 180 degree meridian, the 210 degree meridian, the 225 degree meridian, the 270 degree meridian, the 300 degree meridian, the 315 degree meridian, and combinations thereof.
  • Such methods can be practiced while the lens is located on an eye (e.g., in vivo) or while the lens is not in contact with the eye (e.g., in vitro).
  • the different meridians of the lenses are understood by persons of ordinary skill in the art, with examples of some of the meridians being illustrated in FIG. 4.
  • Certain embodiments of the present methods image a lens by directing broadband light, such as provided by the OCT system, towards the lens being imaged.
  • the broadband light can be filtered if desired to provide light at a narrower wavelength or wavelengths.
  • These or other embodiments may comprise directing infrared or near-infrared laser light or energy toward the lens being imaged.
  • light is emitted from a superluminescent diode at a wavelength from about 800 nm to about 1400 nm, and at a power from about 200 microwatts to 1 milliwatt.
  • the power of the light used for imaging can be greater than 1 milliwatt.
  • the power of the emitted light can be as great as 50 milliwatts.
  • biological tissue imaging such as retinal and corneal OCT imaging, or in vivo imaging
  • light can be used at a greater power than used in vivo since there is no risk of damaging biological tissue of a patient.
  • the power of light is from about 300 microwatts to about 40 milliwatts.
  • the power of light can be between about 400 microwatts and about 30 milliwatts, between about 500 microwatts and 20 milliwatts, or between 600 microwatts and 10 milliwatts.
  • the power of emitted light can be less than 50 milliwatts, less than 40 milliwatts, less than 30 milliwatts, less than 20 milliwatts, less than 10 milliwatts, less than 5 milliwatts, or less than 2 milliwatts.
  • the light can be emitted from a light source at any of the above powers.
  • the light can be attenuated using an attenuator to reduce the light intensity from a greater power to a power useful to obtain the images.
  • other methods may use an OCT system that images the lens or lens mold with a wavelength of light less than 800 nm or greater than 1400nm. In such methods, it may be desirable to use light sensors that sense the light of these other wavelengths.
  • the axial resolution of lenses being imaged using the present methods is from about 1 micrometer to about 100 micrometers, for example, from about 2 micrometers to about 20 micrometers, or from about 3 micrometers to about 10 micrometers; and the lateral resolution can be less than about 100 micrometers, for example, about 80 micrometers, or about 70 micrometers, or about 50 micrometers, or about 25 micrometers, or less.
  • the present methods may also include one or more steps of inspecting the lens for defects. For example, by examining the image(s) of the lens provided by the OCT system, one or more lens defects may be identified which can serve as an indication that the lens is unacceptable for its intended purpose. For example, the lens or lens image can be inspected for bubbles, surface irregularities, such as waviness and the like, tears, chips, opacities, and other defects understood by persons of ordinary skill in the art.
  • the present methods include methods of designing lenses using one or more OCT systems, including SOCT systems if desired.
  • an embodiment relates to methods of designing a vision correcting lens.
  • a method of designing a vision correcting lens comprises examining information obtained from at least one image of a first vision correcting lens imaged with an OCT system, and designing a second vision correcting lens using the examined information of the first vision correcting lens.
  • the vision correcting lens is a contact lens, including a silicone hydrogel contact lens.
  • the examined information can include any lens feature or combination of features.
  • the examined information is selected from the group consisting of lens shape, lens curvature, lens power, lens thickness profile, lens anterior surface shape, lens posterior surface shape, lens edge profile, and combinations thereof.
  • the design methods may also include a step of determining the shape of a cornea of a person using the OCT system.
  • methods of designing a vision correcting lens can include examining the fit of a contact lens on a person's eye, and designing a second contact lens based on the lens fit. For example, if the lens fit of the first lens is acceptable, the second contact lens can be designed to have the same or substantially the same fit. Or, if the lens fit of the first lens is unacceptable, the second contact lens can be designed to have a better or more comfortable fit compared to the first lens.
  • a contact lens design method may comprise one or more of the following steps: determining or measuring corneal surface topography of a patient to produce corneal surface topography information that can be manipulated with a computer; providing tear film information or data of the patient in a computer; designing a posterior contact lens surface based on the corneal surface topography information, the tear film information, or both; designing the thickness of the contact lens and the anterior contact lens surface based on the prescription of the patient and/or the information present in the computer; verifying or confirming the contact lens thickness using an OCT system; and combinations thereof.
  • the OCT system can be used to confirm that contact lenses of specific designs have the desired characteristics.
  • methods can comprise collecting surface data of the contact lenses. For example, anterior surface topography, posterior surface topography, or both can be determined.
  • the optical power of the contact lens can be determined, such as automatically calculated, using the thickness data obtained from OCT images, the surface topography data, and combinations thereof.
  • the present methods also include methods of manufacturing lenses, as described herein, hi certain embodiments, the manufacturing methods are used to produce vision correcting lenses.
  • the lens being manufactured can be a corneal onlay lens or a contact lens.
  • the present manufacturing methods can include lathing the lenses, spincast molding the lenses, or cast molding the lenses.
  • the lens is a cast molded contact lens or cast molded corneal onlay lens.
  • the present methods may include one or more additional steps, such as steps of a cast molding procedure, as understood by persons of ordinary skill in the art.
  • certain methods of manufacturing a lens include placing a polymerizable lens forming material in a lens mold, curing a polymerizable lens forming material in a lens mold, demolding a lens mold to produce a mold member having a polymerized lens product, delensing a polymerized lens product from a mold member of a lens mold, extracting an extractable component from a delensed polymerized lens product, hydrating a delensed polymerized lens product, inspecting a hydrated lens obtained from a lens mold, packaging a lens in a volume of liquid in a package, sterilizing a lens located in a sealed package.
  • Embodiments of the present methods may also include one or more combinations of the foregoing steps.
  • the present manufacturing methods may also comprise a step of imaging a lens mold or a lens mold member using an OCT system.
  • a lens manufacturing process that includes molding lenses, such as contact lenses
  • variations in lens molds that can occur over time may affect the quality and yield rate of lenses obtained therefrom.
  • Embodiments of the present methods can comprise imaging a single mold member of a lens mold, such as of a two-piece lens mold, or separately imaging both mold members of a lens mold. Additional embodiments can comprise imaging a complete mold suitable for forming a lens.
  • the present methods it is possible to measure the curvature of a single mold member, such as the curvature of a lens surface defining region of the mold member, the thickness of the lens-shaped cavity of the lens mold, the thickness of the lens mold or lens mold member, among other things. Measuring these and other features of lens molds can be helpful in manufacturing of lenses, such as contact lenses. For example, changes in lens mold thickness over time can affect curing of polymerizable materials used to produce lenses. Using the present methods, the quality of the lens molds can be monitored to continue to produce large amounts of acceptable lenses.
  • a contact lens 10 was imaged with a Visante OCT system to provide an image of a section of the contact lens. Similar sectional images can be obtained of contact lenses in vitro with other OCT systems. Images such as illustrated in FIG. 1 can be used to determine a thickness profile of the contact lens.
  • digital or computerized representations of contact lenses can be obtained.
  • Such representations can provide information such as surface features and shapes that can help in the design and manufacture of lenses.
  • the representations can be useful in determining curvature of a lens, such as a base curve of a lens, among other things.
  • the image can be pseudo-color coded to provide visually identifiable regions of the imaged lens surface, such as thickness information, spatial features, and the like.
  • FIG. 2 An example of a digital representation of contact lens is illustrated in FIG. 2.
  • the representation includes a computer generated code illustrating the thickness of the lens along a number of meridians.
  • Digital lens representations or lens images obtained from OCT section images can be prepared and appear similar to that illustrated in FIG. 2.
  • FIG. 3 a contact lens 12 was imaged with a Visante OCT system while the contact lens was located on a cornea 14 of an eye of a person.
  • Similar sectional images can be obtained of other contact lenses in vivo using other OCT systems, including SOCT systems. Such in vivo images can be used to help design other contact lenses based on lens shape and lens fit, relative to a person's cornea.
  • a method comprises providing an OCT system or a plurality of OCT systems.
  • the OCT systems can be obtained from publicly available sources.
  • a lens such as a contact lens or other vision correcting lens can be placed in a container containing a volume of liquid, such as water. The container with the lens is placed in a light path of the OCT system.
  • the data obtained therefrom is collected by a computer and can be displayed on a computer monitor or other display device.
  • Software can be used to analyze the data and provide images useful in the present methods.
  • the images can be examined to determine thickness profiles, edge profiles, surface designs, surface curvature and the like, which can then also be used in the design and manufacture of additional contact lenses.
  • certain embodiments of the present methods can be understood to comprise, consist essentially of, or consist of imaging a lens, such as a contact lens, using an OCT system other than a SOCT system.

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Abstract

Selon l'invention, des systèmes de tomographie par cohérence optique (OCT) sont utilisés pour mesurer des lentilles. Les procédés de l'invention font appel à un système OCT afin d'obtenir une ou plusieurs images d'une lentille. Par exemple, un système OCT peut être utilisé afin d'obtenir des images de section, des images de surface, ou des combinaisons d'images de section et d'images de surface de lentilles de correction visuelle, tels que des lentilles de contact, des lentilles intraoculaires, des lentilles extra-cornéennes, des lentilles intra-cornéennes et des verres de lunettes, ou des verres de correction non visuelle, tel que des verres d'instruments optiques et d'instruments de diagnostic. Les images peuvent être utilisées afin de déterminer des caractéristiques des lentilles, tel que les formes de surface, les épaisseurs, les courbures, les puissances des lentilles, et les profil des bords, entre autres. Parmi les procédés de l'invention, on trouve des procédés de mesure de lentilles, des procédés de conception de lentilles et des procédés de fabrication de lentilles.
PCT/US2007/069588 2006-05-25 2007-05-23 Mesure de lentilles et de moules pour lentilles à l'aide de la tomographie par cohérence optique WO2007140220A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN2007800192781A CN101454708B (zh) 2006-05-25 2007-05-23 使用光学相干断层成像术测量镜片和镜片模具
AU2007267643A AU2007267643A1 (en) 2006-05-25 2007-05-23 Measurement of lenses and lens molds using optical coherence tomography
HK09108401.7A HK1129466A1 (en) 2006-05-25 2009-09-14 Measurement of lenses and lens molds using optical coherence tomography

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US80320506P 2006-05-25 2006-05-25
US60/803,205 2006-05-25
US11/752,202 US7416300B2 (en) 2006-05-25 2007-05-22 Measurement of lenses and lens molds using optical coherence tomography
US11/752,202 2007-05-22

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WO2018078602A1 (fr) * 2016-10-31 2018-05-03 Novartis Ag Procédé et système d'inspection de lentille de contact

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Publication number Priority date Publication date Assignee Title
WO2009076028A1 (fr) * 2007-12-07 2009-06-18 Bausch & Lomb Incorporated Maintien d'un dispositif ophtalmologique dans un état hydraté
WO2018078602A1 (fr) * 2016-10-31 2018-05-03 Novartis Ag Procédé et système d'inspection de lentille de contact
US20180120199A1 (en) * 2016-10-31 2018-05-03 Novartis Ag Contact lens inspection method and system
US10830666B2 (en) 2016-10-31 2020-11-10 Alcon Inc. Contact lens inspection method and system

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