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KR-102963728-B1 - Contact lenses and related methods

KR102963728B1KR 102963728 B1KR102963728 B1KR 102963728B1KR-102963728-B1

Abstract

A contact lens (2001) and a method for manufacturing such a lens (2001) are described. The contact lens (2001) includes an optical region (202). The optical region (202) includes a central portion having a center of curvature on the optical axis (219), and a first annular portion (203) extending radially outward from the central portion (205). The first annular portion (203) provides an additional degree of curvature. One of the front surface and the rear surface of the first annular portion (203) has a center of curvature on the optical axis (219). The other of the front surface and the rear surface of the first annular portion (203) has a center of curvature spaced apart from the optical axis (219) by a first distance.

Inventors

  • 퀴터 케일리
  • 웨버 마틴

Assignees

  • 쿠퍼비젼 인터내셔널 리미티드

Dates

Publication Date
20260513
Application Date
20240722
Priority Date
20230725

Claims (20)

  1. A contact lens comprising an optic zone, The optical zone is: A central part having a center of curvature on the optical axis; and A first annular portion extending radially outward from the central portion A contact lens comprising, wherein the first annular portion provides radial curvature add power, and one of the front surface and the rear surface of the first annular portion has a center of curvature on the optical axis, and the other of the front surface and the rear surface of the first annular portion has a center of curvature spaced apart from the optical axis by a first distance, and the surface of the first annular portion having a center of curvature on the optical axis provides radial curvature add power of +0.5 D to +4.0 D, and the surface of the first annular portion having a center of curvature spaced apart from the optical axis provides radial curvature add power of +4.0 D to +20.0 D.
  2. A contact lens according to claim 1, wherein the surface of a first annular portion having a center of curvature spaced apart from the optical axis by a first distance has a radial sagittal power profile that increases as the radial distance from the optical axis increases.
  3. A contact lens according to claim 1 or 2, wherein the surface of a first annular portion having a center of curvature spaced apart from the optical axis has a radial sagittal power profile defined by a straight line having a gradient of 1.0 D/mm to 6.0 D/mm, or a curve having an average gradient of 1.0 D/mm to 6.0 D/mm.
  4. A contact lens according to claim 1 or 2, wherein the surface of a first annular portion having a center of curvature spaced apart from the optical axis by a first distance has an average radial sagittal additional degree of 0 over the radial width of the first annular portion.
  5. A contact lens according to claim 1 or 2, wherein, for the surface of a first annular portion having a center of curvature spaced apart from the optical axis by a first distance, the radial sagittal degree at the inner edge of the first annular portion is 0.5 D to 2.5 D smaller than the radial sagittal degree at the outer edge of the central portion.
  6. A contact lens according to claim 5, wherein, for the surface of a first annular portion having a center of curvature spaced apart from the optical axis by a first distance, the radial sagittal degree at the outer edge of the first annular region is 0.5 D to 2.0 D greater than the radial sagittal degree at the outer edge of the central portion.
  7. A contact lens according to claim 1 or 2, wherein both the anterior surface and the posterior surface of the first annular portion provide a radial sagittal additional power greater than 0 over the radial width of the first annular portion.
  8. A contact lens according to claim 1 or 2, wherein the first annular portion has an average radial sagittal additional power of +0.5 D to +6.0 D.
  9. A contact lens according to claim 1 or 2, wherein the first annular portion has a radial sagittal power profile that increases as the radial distance from the optical axis increases.
  10. A contact lens according to claim 9, wherein the first annular portion has a radial sagittal power profile defined by a straight line having a gradient of 0.5 D/mm to 5.0 D/mm, or a curve having an average gradient of 0.5 D/mm to 5.0 D/mm.
  11. A contact lens according to claim 1 or 2, wherein the first annular portion has an average radial curvature degree of +4.5 D to +24.0 D.
  12. A contact lens according to claim 1 or 2, comprising at least one additional annular portion concentric to the first annular portion, wherein each additional annular portion provides an additional degree of radial curvature, and for each additional annular portion, one of the front surface and the rear surface of the portion has a center of curvature on the optical axis, and the other of the front surface and the rear surface of the portion has a center of curvature spaced apart from the optical axis by a predetermined distance.
  13. A contact lens according to claim 12, wherein the radial sagittal gradient of each additional annular portion depends on the radial position of the annular portion.
  14. A contact lens according to claim 12, wherein the first annular portion has a radial sagittal power profile that increases by a first gradient as the radial distance from the optical axis increases, and the second annular portion has a radial sagittal power profile that increases by a second gradient smaller than the first gradient as the radial distance from the optical axis increases.
  15. A contact lens according to claim 12, comprising a plurality of concentric additional annular portions, wherein the additional annular portions are spaced apart by distance portions having a basic radial curvature degree.
  16. A contact lens according to claim 1 or 2, wherein the first annular portion extends radially outward by 0.5 mm to 1.5 mm from the periphery of the central region.
  17. A contact lens according to claim 1 or 2, wherein the lens comprises an elastomer material, a silicone elastomer material, a hydrogel material, or a silicone hydrogel material, or a mixture thereof.
  18. A method for manufacturing a contact lens according to claim 1 or 2, Step of forming a contact lens It includes, and the lens includes an optical zone, and the optical zone is: A central part having a center of curvature on the optical axis; and A first annular portion extending radially outward from the central region A method comprising: a first annular portion providing an additional degree of radial curvature, wherein one of the front surface and the rear surface of the first annular portion has a center of curvature on an optical axis, and the other of the front surface and the rear surface of the first annular portion has a center of curvature spaced apart from the optical axis by a first distance, wherein the surface of the first annular portion having a center of curvature on the optical axis provides an additional degree of radial curvature of +0.5 D to +4.0 D, and the surface of the first annular portion having a center of curvature spaced apart from the optical axis provides an additional degree of radial curvature of +4.0 D to +20.0 D.
  19. In Paragraph 18, A step of providing a female mold member having a concave lens forming surface; A step of providing a male mold member having a convex lens forming surface—one of the concave and convex lens forming surfaces is configured to form a first annular portion having a center of curvature spaced by a first distance from the optical axis of the lens, and the other of the concave and convex lens forming surfaces is configured to form a first annular portion having a center of curvature on the optical axis of the lens—; and Step of forming a lens using female and male mold members A method that additionally includes
  20. In Paragraph 19, A method further comprising the step of cast molding a lens using a male mold member and a female mold member.

Description

Contact lenses and related methods The present invention relates to contact lenses. The present invention relates particularly to contact lenses for slowing the progression of myopia, but is not limited thereto. The present invention also relates to a method for manufacturing such lenses. Many people, including children and adults, need contact lenses to correct myopia (nearsightedness). Myopic eyes focus light entering from distant objects to a position in front of the retina. Therefore, light converges toward the plane in front of the retina and diverges toward the retina, and upon reaching the retina, it is out of focus. Conventional lenses for correcting myopia (e.g., eyeglass lenses and contact lenses) reduce convergence (in the case of contact lenses) or diverge (in the case of eyeglass lenses) of light entering from distant objects before it reaches the eye, thereby shifting the position of the focal point onto the retina. It was suggested decades ago that the progression of myopia in children and young adults could be slowed or prevented by under-correcting—that is, by shifting the focus toward the retina but not completely onto it. However, this approach inevitably results in reduced distance vision compared to the visual acuity achieved with lenses that fully correct myopia. Furthermore, the effectiveness of under-correcting in controlling progressing myopia is now considered questionable. A more recent approach to correcting myopia involves providing lenses that possess both one or more zones providing complete correction of distance vision and one or more zones that under-correct or intentionally induce myopic defocus. This approach has been suggested to prevent or slow the development or progression of myopia in children and young adults while providing good distance vision. For lenses having a defocus area, the area providing full correction of distance vision is generally referred to as the base power area, while the area providing undercorrection or intentionally inducing myopic defocus is generally referred to as the myopic defocus area or additional power area (because the refractive power is greater positive or less negative than the power of the distance areas). The surface of the additional power area(s) (typically the anterior surface) has a radius of curvature smaller than that of the distance power area(s) and thus provides a greater positive or less negative power to the eye. The additional power area(s) are designed to focus incoming parallel light (i.e., light from the distance) into the eye in front of the retina (i.e., closer to the lens), whereas the distance power area(s) are designed to focus light to form an image on the retina (i.e., further away from the lens). A known type of contact lens that reduces the progression of myopia is the bifocal contact lens available under the name MISIGHT (CooperVision, Inc.). This bifocal lens differs from bifocal or multifocal contact lenses configured to improve presbyopic vision in that it is configured with specific optical dimensions to allow a person with accommodative ability to see both distant and near objects using a distance correction (i.e., the base power). The treatment zone of a bifocal lens with an additional power also provides myopically defocused images at both distance and near viewing distances. While these lenses have been found to be beneficial in preventing or slowing the development or progression of myopia, the annular additional power area can cause unwanted visual side effects. Light focused by the annular additional power area in front of the retina is out of focus, forming a defocused ring on the retina. Consequently, wearers of these lenses may see an image around the ring or 'halo' formed on the retina, particularly for small, bright objects such as streetlights and car headlights. Furthermore, instead of using the eye's natural accommodation (i.e., the eye's natural ability to change focal length) to focus on near objects, theoretically, the wearer may use the additional focus in front of the retina originating from the annular additional power area to focus on near objects; in other words, the wearer may unintentionally use the lenses in the same way as presbyopia-correcting lenses, which is undesirable for younger subjects. For the treatment of myopia, it has been recognized that providing lenses that introduce additional myopic defocus may be beneficial. For the treatment of presbyopia, providing lenses that extend the depth of focus may be beneficial. An additional lens has been developed that can be used to treat myopia and is designed to eliminate the halo observed around focused distance images. In this lens, the annular region is configured so as not to form a single on-axis image in front of the retina, thereby preventing such images from being used to avoid the need for the eye to adjust for near targets. Rather, a distance point light source is imaged by the annular region as a ring-shaped focal