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WO2018166075A1 - 一种硬性角膜接触镜 - Google Patents

一种硬性角膜接触镜 Download PDF

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Publication number
WO2018166075A1
WO2018166075A1 PCT/CN2017/086456 CN2017086456W WO2018166075A1 WO 2018166075 A1 WO2018166075 A1 WO 2018166075A1 CN 2017086456 W CN2017086456 W CN 2017086456W WO 2018166075 A1 WO2018166075 A1 WO 2018166075A1
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area
radius
curvature
central
front surface
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French (fr)
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施伯彦
黄美丽
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Priority to US16/495,053 priority Critical patent/US11243413B2/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/04—Contact lenses for the eyes
    • G02C7/041—Contact lenses for the eyes bifocal; multifocal
    • G02C7/044—Annular configuration, e.g. pupil tuned
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/04—Contact lenses for the eyes
    • G02C7/041—Contact lenses for the eyes bifocal; multifocal
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/04—Contact lenses for the eyes
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/04—Contact lenses for the eyes
    • G02C7/047—Contact lens fitting; Contact lenses for orthokeratology; Contact lenses for specially shaped corneae
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/04—Contact lenses for the eyes
    • G02C7/049—Contact lenses having special fitting or structural features achieved by special materials or material structures
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
    • G02C2202/24—Myopia progression prevention

Definitions

  • the present invention relates to a rigid contact lens.
  • Hard contact lens is a common lens for correcting vision in myopic patients.
  • the optical surface of the front surface of the existing hard contact lens (6mm-8mm in the center of the lens) is spherical, and the radius of curvature is the same, that is, the single focus lens.
  • From the perspective of opto-optics there is a paracentric far-sighted defocus phenomenon in the human eye, that is, the same object is imaged on the retina, and the image point in the center of the object falls in the central region of the retina, but the image point in the peripheral part of the object falls behind the retina.
  • the so-called side center far vision defocus This phenomenon has also proven to be an important cause of myopia development. Reducing this phenomenon can slow down the development of myopia. Users of existing monofocal lenses may develop myopia due to paracentric hyperopia.
  • the present invention provides a rigid contact lens to solve the technical problem that the user of the existing rigid contact lens may develop myopia due to side-centered hyperopia.
  • the technical solution adopted by the present invention is:
  • a rigid contact lens comprising a front surface optical region and a rear surface light
  • the learning area is characterized in that: the front surface optical area comprises a front surface central area and a defocus area located around the central area of the front surface, the front surface central area being a spherical surface, and the radius of curvature of the defocused area is from The outer side of the central portion of the front surface begins to decrease, and the minimum radius of curvature of the defocused area is 95%-50% of the radius of curvature of the central portion of the front surface.
  • the rear surface optical region includes a rear surface central region and a reverse region located at a periphery of the rear surface central region, the rear surface central region being a spherical surface, and the reverse region having a radius of curvature from the central portion of the rear surface
  • the outer side begins to decrease, and the minimum radius of curvature of the inversion area is 98%-80% of the radius of curvature of the central area of the rear surface.
  • the radius of curvature of the central portion of the front surface is 5.0 mm to 30.0 mm
  • the radius of the projection plane of the central portion of the front surface is 1.0 mm to 3.0 mm
  • the radius of curvature of the central portion of the rear surface is 5.0 mm to 30.0 mm.
  • the radius of the projection plane in the central area of the surface is 2.0mm-6.0mm
  • the out-of-focus area is an area from the edge of the central portion of the front surface to 4.0 mm from the center of the lens, and the inversion area is an annulus of 1.0 mm to 4.0 mm from the center of the rear surface.
  • the front surface optical region includes the front surface central region and the defocus region located around the central portion of the front surface
  • the central portion of the front surface is a spherical surface
  • the radius of curvature of the out-of-focus region starts from the outer side of the central portion of the front surface.
  • the minimum radius of curvature of the out-of-focus area is 95%-50% of the radius of curvature of the central area of the front surface, so the same object is imaged on the retina.
  • the image point in the center of the object falls in the central region of the retina, and the image point around the object appears to have a myopic drift, which solves the technical problem that the existing rigid contact lens does not reduce the far center defocusing.
  • FIG. 1 is a schematic structural view of a first embodiment of the present invention.
  • 1 is the central area of the front surface
  • 2 is the out-of-focus area
  • 3 is the central area of the rear surface
  • 4 is the inversion area.
  • a rigid contact lens includes a front surface optical region including a front surface central region and a defocused region located at a periphery of a central portion of the front surface, and a front surface optical region, wherein the central portion of the front surface is The spherical surface, the radius of curvature of the defocused area decreases from the outer side of the central area of the front surface, the minimum radius of curvature of the defocused area is 95%-50% of the radius of curvature of the central area of the front surface, and the rear surface optical area includes the central area of the rear surface and The inversion area around the central area of the rear surface, the central area of the rear surface is a spherical surface, and the radius of curvature of the inversion area decreases from the outer side of the central area of the rear surface, and the minimum radius of curvature of the inversion area is the radius of curvature of the central area of the rear surface.
  • the radius of curvature of the central area of the front surface is 5.0mm-30.0mm
  • the radius of the projection plane of the central area of the front surface is 1.0mm-3.0mm
  • the central area of the rear surface The radius of curvature of the domain is 5.0 mm - 30.0 mm
  • the radius of the projection plane of the central region of the rear surface is 2.0 mm - 6.0 mm.
  • the defocused area is an area from the edge of the central portion of the front surface to a distance of 4.0 mm from the center of the lens
  • the inversion area is an annulus of 1.0 mm to 4.0 mm from the central portion of the rear surface.
  • the same object is imaged on the retina, and the image point in the center of the object falls in the central region of the retina, and the image point around the object appears to have a myopic drift, which solves the technical problem that the existing hard contact lens does not reduce the side center far vision defocus.

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  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Eyeglasses (AREA)
  • Prostheses (AREA)

Abstract

一种硬性角膜接触镜，包括前表面光学区域和后表面光学区域，前表面光学区域包括前表面中央区域（1）和位于前表面中央区域（1）周边的离焦区域（2），前表面中央区域（1）为球面，离焦区域（2）的曲率半径从前表面中央区域（1）的外侧开始不断减小，离焦区域（2）的最小曲率半径是前表面中央区域（1）曲率半径的95％-50％。由于人眼的结构，人眼具有旁中心远视性离焦现象，即一个像的中心部位的像点正好在视网膜的黄斑区域上，而周边区域的像却落在视网膜的后方。有实验证明旁中心远视性离焦是近视发展的一个重要原因，减少旁中心远视性离焦有助于近视的控制。本设计由于镜片周边的屈光力大于中央区域，所以可以减少旁中心远视性离焦，进而产生近视控制作用。

Description

一种硬性角膜接触镜 技术领域
本发明涉及一种硬性角膜接触镜。
背景技术
硬性角膜接触镜是近视患者矫正视力的常用镜片，现有硬性角膜接触镜的前表面的光学区域(镜片中央6mm-8mm区域)都是球面的，曲率半径一致，也就是单焦点的镜片。而从视光学角度，人眼存在旁中心远视性离焦现象，即同一物体在视网膜上成像，物体中央的像点落在视网膜中央区域，但物体周边部分的像点落在了视网膜的后方，即所谓旁中心远视性离焦。这种现象也被证明是近视发展的重要原因。减少这种现象就可以减缓近视的发展。现有的单焦点镜片的使用者会因旁中心远视性离焦导致近视发展。
发明内容
本发明提供一种硬性角膜接触镜，以解决现有硬性角膜接触镜的使用者会因旁中心远视性离焦导致近视发展的技术问题。
为了解决以上技术问题，本发明采取的技术方案是：
一种硬性角膜接触镜，包括前表面光学区域和后表面光 学区域，其特征是：所述前表面光学区域包括前表面中央区域和位于所述前表面中央区域周边的离焦区域，所述前表面中央区域为球面，所述离焦区域的曲率半径从所述前表面中央区域的外侧开始不断减小，所述离焦区域的最小曲率半径是所述前表面中央区域曲率半径的95％-50％。
所述后表面光学区域包括后表面中央区域和位于所述后表面中央区域周边的反转区域，所述后表面中央区域为球面，所述反转区域的曲率半径从所述后表面中央区域的外侧开始不断减小，所述反转区域的最小曲率半径是所述后表面中央区域曲率半径的98％-80％。
所述前表面中央区域曲率半径为5.0mm-30.0mm，所述前表面中央区域投射平面的半径为1.0mm-3.0mm，所述后表面中央区域曲率半径为5.0mm-30.0mm，所述后表面中央区域投射平面的半径为2.0mm-6.0mm
所述离焦区域为从所述前表面中央区域边缘开始到距镜片中心4.0mm的区域，所述反转区域为从所述后表面中央区域外1.0mm-4.0mm的一个环带。
在采用了上述技术方案后，由于前表面光学区域包括前表面中央区域和位于前表面中央区域周边的离焦区域，前表面中央区域为球面，离焦区域的曲率半径从前表面中央区域的外侧开始不断减小，离焦区域的最小曲率半径是前表面中央区域曲率半径的95％-50％，所以同一物体在视网膜上成像， 物体中央的像点落在视网膜中央区域，物体周边部分的像点出现近视性漂移，解决了现有硬性角膜接触镜没有减少旁中心远视性离焦的技术问题。
附图说明
图1是本发明具体实施例一的结构示意图。
图中，1为前表面中央区域，2为离焦区域，3为后表面中央区域，4为反转区域。
具体实施方式
具体实施例一
如图1所示，一种硬性角膜接触镜，包括前表面光学区域和后表面光学区域，前表面光学区域包括前表面中央区域和位于前表面中央区域周边的离焦区域，前表面中央区域为球面，离焦区域的曲率半径从前表面中央区域的外侧开始不断减小，离焦区域的最小曲率半径是前表面中央区域曲率半径的95％-50％，后表面光学区域包括后表面中央区域和位于后表面中央区域周边的反转区域，后表面中央区域为球面，反转区域的曲率半径从后表面中央区域的外侧开始不断减小，反转区域的最小曲率半径是后表面中央区域曲率半径的98％-80％，前表面中央区域曲率半径为5.0mm-30.0mm，前表面中央区域投射平面的半径为1.0mm-3.0mm，后表面中央区 域曲率半径为5.0mm-30.0mm，后表面中央区域投射平面的半径为2.0mm-6.0mm。离焦区域为从前表面中央区域边缘开始到距镜片中心4.0mm的区域，反转区域为从后表面中央区域外1.0mm-4.0mm的一个环带。同一物体在视网膜上成像，物体中央的像点落在视网膜中央区域，物体周边部分的像点出现近视性漂移，解决了现有硬性角膜接触镜没有减少旁中心远视性离焦的技术问题。

Claims (4)

  1. 一种硬性角膜接触镜，包括前表面光学区域和后表面光学区域，其特征是：所述前表面光学区域包括前表面中央区域和位于所述前表面中央区域周边的离焦区域，所述前表面中央区域为球面，所述离焦区域的曲率半径从所述前表面中央区域的外侧开始不断减小，所述离焦区域的最小曲率半径是所述前表面中央区域曲率半径的95％-50％。
  2. 如权利要求1所述的硬性角膜接触镜，其特征是：所述后表面光学区域包括后表面中央区域和位于所述后表面中央区域周边的反转区域，所述后表面中央区域为球面，所述反转区域的曲率半径从所述后表面中央区域的外侧开始不断减小，所述反转区域的最小曲率半径是所述后表面中央区域曲率半径的98％-80％。
  3. 如权利要求2所述的硬性角膜接触镜，其特征是：所述前表面中央区域曲率半径为5.0mm-30.0mm，所述前表面中央区域投射平面的半径为1.0mm-3.0mm，所述后表面中央区域曲率半径为5.0mm-30.0mm，所述后表面中央区域投射平面的半径为2.0mm-6.0mm。
  4. 如权利要求3所述的硬性角膜接触镜，其特征是：所述离焦区域为从所述前表面中央区域边缘开始到距镜片中心4.0mm的区域，所述反转区域为从所述后表面中央区域外1.0mm-4.0mm的一个环带。
PCT/CN2017/086456 2017-03-17 2017-05-28 一种硬性角膜接触镜 Ceased WO2018166075A1 (zh)

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US16/495,053 US11243413B2 (en) 2017-03-17 2017-05-28 Hard corneal contact lens

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US20200341297A1 (en) 2020-10-29
TW201835642A (zh) 2018-10-01

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