CN112612145B - Corneal contact lens - Google Patents
Corneal contact lens Download PDFInfo
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- CN112612145B CN112612145B CN202011529643.7A CN202011529643A CN112612145B CN 112612145 B CN112612145 B CN 112612145B CN 202011529643 A CN202011529643 A CN 202011529643A CN 112612145 B CN112612145 B CN 112612145B
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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
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Abstract
The invention discloses a corneal contact lens which comprises a lens body, wherein the lens body comprises a first out-of-focus control area and a second out-of-focus control area, and the first out-of-focus control area and the second out-of-focus control area are respectively used for changing the optical out-of-focus amount of an area corresponding to a cornea after adaptation. The second defocus control area surrounds the first defocus control area, and the boundaries of the first defocus control area and the second defocus control area in at least one pair of opposite radial directions taking the center of the cornea after adaptation as the center are asymmetric.
Description
Technical Field
The invention relates to the field of ophthalmic medical treatment, in particular to a corneal contact lens.
Background
The optical defocus of the eyeball means that parallel rays enter the eyeball, the focus is not on the retina, if the focus is in front of the retina, the optical defocus is near-sighted defocus, and otherwise, the optical defocus is far-sighted defocus. Clinically, the eye product assists the eyeball to perform refraction on light or change the refractive power of the eyeball, so that the light is imaged on the retina to achieve the effect of controlling the eyesight. In the prior art, frame glasses or a corneal contact lens are mainly adopted, the corneal contact lens takes the center of the lens as the center to form concentric circle, multilayer and symmetrically distributed toroidal curved surface lenses, and the frame glasses adopt a bifocal or multi-zone multifocal optical design.
With the trend of obvious increase of myopia incidence in China in recent years, the design of a corneal contact lens with better vision control effect is a subject which is continuously researched in the field of ophthalmology.
Disclosure of Invention
The invention aims to provide a corneal contact lens which can achieve better control effect on the optical defocusing amount of an eyeball compared with the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a contact lens comprising a lens body, the lens body comprising a first out-of-focus control area and a second out-of-focus control area, the first out-of-focus control area and the second out-of-focus control area being for changing an optical out-of-focus amount of a corresponding area of an adapted cornea, respectively, the second out-of-focus control area surrounding the first out-of-focus control area, a boundary of the first out-of-focus control area and the second out-of-focus control area being asymmetric in at least one pair of opposing radial directions centered on a center of the adapted cornea.
Preferably, the boundary asymmetry of the first through-focus control region and the second through-focus control region in a pair of opposite radial directions centered on the adapted cornea center includes: the distances from the boundary to the center of the first defocus control area and the second defocus control area in a pair of opposite radial directions centered on the adapted cornea center are not uniform.
Preferably, the at least one pair of opposing radial directions includes a pair of radial directions parallel to a direction in which the adapted cornea points from the nasal side to the temporal side.
Preferably, the boundary of the first out-of-focus control area and the second out-of-focus control area is symmetrical about a preset axis, and the preset axis is an axis parallel to the direction in which the adapted cornea points from the nasal side to the temporal side and passing through the center of the adapted cornea.
Preferably, the boundaries of the first defocus control area and the second defocus control area are symmetrical in any pair of opposite radial directions centered on a preset point on the lens body, and the preset point on the lens body is deviated from the center of a cornea after the contact lens is adapted to the cornea.
Preferably, the preset point is the center of the lens body.
Preferably, the minimum distance from the boundary of the first defocus control area and the second defocus control area to the center of the cornea after fitting is greater than or equal to a first preset value, and the maximum distance is less than or equal to a second preset value.
Preferably, a boundary between the first defocus control area and the second defocus control area is circular or elliptical.
Preferably, the refractive power of each position of the second defocus control region is uniform, or the second defocus control region includes a plurality of divisional regions having different refractive powers.
Preferably, the first defocus control area is configured to eliminate an optical defocus amount of the adapted corresponding region of the cornea, and the second defocus control area is configured to increase a myopic optical defocus amount of the adapted corresponding region of the cornea.
According to the technical scheme, the corneal contact lens provided by the invention comprises a lens body, wherein the lens body comprises a first out-of-focus control area and a second out-of-focus control area, and the first out-of-focus control area and the second out-of-focus control area are respectively used for changing the optical out-of-focus amount of the corresponding area of the adapted cornea. The second defocus control area surrounds the first defocus control area, and the boundaries of the first defocus control area and the second defocus control area in at least one pair of opposite radial directions taking the center of the adapted cornea as the center are asymmetric.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a corneal contact lens provided in accordance with an embodiment of the present invention;
FIG. 2 is a schematic view of a corneal contact lens provided in accordance with yet another embodiment of the present invention;
FIG. 3 is a schematic view of a corneal contact lens provided in accordance with yet another embodiment of the present invention;
FIG. 4 is a schematic view of a contact lens provided in accordance with another embodiment of the present invention;
FIG. 5 is a schematic illustration of a specific example of zoning a refractive retinal topography;
FIG. 6 (a) is a diagram of relative peripheral retinal refractive topography prior to dispensing in one embodiment;
FIG. 6 (b) is a refractive topographic map of the opposing peripheral retina after dispensing of a lens in one embodiment;
FIG. 6 (c) is a graph of the relative peripheral retinal refractive topography difference in one embodiment;
FIG. 7 (a) is a diagram of relative peripheral retinal refractive topography prior to dispensing in one embodiment;
FIG. 7 (b) is a refractive topographic map of the opposing peripheral retina after dispensing of a lens in one embodiment;
FIG. 7 (c) is a graph of the relative peripheral retinal refractive topography difference in one embodiment;
FIG. 8 (a) is a top view, a middle view and a bottom view of the front and rear relative peripheral retinal refractive topograms of a lens set in a specific example, the front and rear relative peripheral retinal refractive topograms of the lens set in the middle, the relative peripheral retinal refractive topograms of the lens set in the middle and the front and rear relative peripheral retinal refractive topograms of the lens set in the middle in sequence;
FIG. 8 (b) is a top view, a middle view and a bottom view of the relative peripheral retinal refractive topographic map before the glasses are worn in the deflection group, the relative peripheral retinal refractive topographic map after the glasses are worn in the deflection group and the difference map of the relative peripheral retinal refractive topographic map in the deflection group in sequence in a specific example;
FIG. 9 (a) is a chart of relative peripheral retinal defocus topographic map differences for a central group in one embodiment;
FIG. 9 (b) is a diagram of the relative peripheral retinal defocus topographic map difference for the offset group in one embodiment;
FIG. 10 (a) is a graph of the relative peripheral defocus difference for the central group of retinal horizontal meridians in one embodiment;
FIG. 10 (b) is a graph of relative peripheral defocus variation of the central horizontal meridian of the retina in the offset group in one embodiment;
FIG. 11 (a) is a diagram of a computer simulation of the change in the horizontal meridian of the central retina on the temporal side moving a contact lens to the temporal side in one embodiment;
fig. 11 (b) is a diagram of the change in the horizontal meridian of the central retina on the nasal side of the cornea simulated by the computer to move the contact lens to the temporal side in one embodiment.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Embodiments of the present invention provide a contact lens, including a lens body, the lens body including a first out-of-focus control area and a second out-of-focus control area, the first out-of-focus control area and the second out-of-focus control area being respectively used for changing an optical out-of-focus amount of a corresponding area of an adapted cornea, the second out-of-focus control area surrounding the first out-of-focus control area, boundaries of the first out-of-focus control area and the second out-of-focus control area being asymmetric in at least one pair of opposite radial directions centered on a center of the adapted cornea.
The optical defocus amount refers to a parameter for representing the distance between a focus point formed by parallel rays entering an eyeball and passing through a cornea and a retina. After the corneal contact lens is adapted to a cornea, the first out-of-focus control area of the lens body enables the optical out-of-focus amount of the corresponding area of the cornea to be changed, and the second out-of-focus control area of the lens body enables the optical out-of-focus amount of the corresponding area of the cornea to be changed, so that the control effect on the optical out-of-focus amount of an eye can be achieved through the corneal contact lens.
The boundary asymmetry of the first defocus control area and the second defocus control area in a pair of opposite radial directions means that the position of the boundary of the first defocus control area and the second defocus control area in one radial direction of the opposite radial directions is asymmetric with the position in the other radial direction of the opposite radial directions.
The cornea contact lens of the embodiment has asymmetric boundaries of at least one pair of opposite radial first defocus control area and second defocus control area which take the adapted cornea center as the center, and compared with the existing cornea contact lens which takes the cornea center as strict radial symmetry, the cornea contact lens can achieve better control effect on the optical defocus amount of the eyeball.
The present corneal contact lens is described in detail below with reference to the following detailed description and accompanying drawings. The contact lens of the embodiment comprises a lens body, and the lens body can be made of an optical medium material which is suitable for being in contact with an eyeball and has no damage to the eyeball.
The lens body comprises a first out-of-focus control area and a second out-of-focus control area, optical design can be carried out on each out-of-focus control area according to application requirements in practical application, the refractive index, refractive power or shape and the like of each out-of-focus control area are designed, and the required control effect on the optical out-of-focus amount of the eyeball is achieved.
The second through-focus control area surrounds the first through-focus control area, wherein boundaries of the first through-focus control area and the second through-focus control area are asymmetric in at least one pair of opposite radial directions centered on the adapted cornea center. Referring to fig. 1, fig. 1 is a schematic diagram of a contact lens provided in an embodiment, and as shown in the diagram, a lens body includes a first out-of-focus control area 11 and a second out-of-focus control area 12, and assuming that the center of the cornea after the contact lens is adapted to the cornea is O point, a pair of opposite radial directions r taking O point as the center 1 And a radial direction r 2 In the radial direction r 1 The boundary 13 between the upper first defocus control area and the second defocus control area and the radial direction r 2 The boundary 13 of the upper first out-of-focus control area and the second out-of-focus control area is asymmetric, i.e. the boundary 13 of the first out-of-focus control area and the second out-of-focus control area is in the radial direction r 1 Upper position and boundary 13 of the first and second defocus control areas in radial direction r 2 Are not symmetrical.
Specifically, the distances from the boundaries of the first defocus control area and the second defocus control area to the center in a pair of opposite radial directions centered on the adapted cornea center may be made different, so that the boundaries of the first defocus control area and the second defocus control area in a pair of opposite radial directions centered on the adapted cornea center are made asymmetric.
In particular implementation, the first out-of-focus control region and the second out-of-focus control region of the lens body can be designed in shapes according to application requirements, so that the boundaries of the first out-of-focus control region and the second out-of-focus control region on the lens body are asymmetric in at least one pair of opposite radial directions with the adapted cornea center as the center. According to the practical application requirement, the boundary of the first out-of-focus control area and the second out-of-focus control area on the lens body can be designed to be asymmetric in a plurality of pairs of opposite radial directions by taking the center of the cornea after adaptation as the center, so that the corneal contact lens achieves the required control effect on the optical out-of-focus amount of the eye.
Optionally, at least one pair of opposite radial directions includes a pair of radial directions parallel to the direction in which the adapted cornea points from the nasal side to the temporal side, and the contact lens with such a structure is adapted to the cornea, and the boundaries of the first defocus control area and the second defocus control area on the lens body of the contact lens are asymmetric in position in the pair of radial directions parallel to the direction from the nasal side to the temporal side.
Optionally, in an embodiment, the boundaries of the first defocus control area and the second defocus control area of the lens body are symmetrical about a preset axis. Referring to fig. 2, fig. 2 is a schematic diagram of a contact lens provided in a further embodiment, the contact lens includes a lens body, the center of the cornea where the contact lens is fitted behind the cornea is an O point, the lens body includes a first defocus control area 11 and a second defocus control area 12, wherein the second defocus control area 12 surrounds the first defocus control area 11, the boundary 13 of the first defocus control area 11 and the second defocus control area 12 is symmetric about an axis k, but the boundary 13 of the first defocus control area and the second defocus control area is asymmetric in opposite radial directions centered at the O point, for example, the boundary 13 of the two defocus control areas is asymmetric in a pair of opposite radial directions r centered at the O point 1 And a radial direction r 2 Asymmetric, the boundary 13 of the two defocus control areas is in a pair of opposite radial directions r centered at the point O 3 And a radial direction r 4 Is asymmetric in the upper part.
Preferably, the preset axis may be an axis parallel to a direction in which the adapted cornea points from the nasal side to the temporal side and passing through the center of the adapted cornea. But not limited thereto, the predetermined axis may be a line parallel to the other direction on the lens body.
In practical applications, the shape of the first out-of-focus control area 11 of the lens body can be circular or elliptical, and the shape enclosed by the edge of the second out-of-focus control area 12 of the lens body can be circular or elliptical, so that the lens body can be optically designed more conveniently by adopting the structural design, and can be adapted to the tissue structure of the eyeball better, and the lens can be worn by a user conveniently. Referring to fig. 3, fig. 3 is a schematic diagram of a contact lens according to another embodiment, in which the first defocus control area 11 of the lens body shown in fig. 3 is an ellipse, and the shape enclosed by the edge of the second defocus control area 12 is an ellipse.
Optionally, in a further embodiment, the contact lens is symmetrical in the boundary of the first out-of-focus control region and the second out-of-focus control region in any pair of opposite radial directions centered on the preset point on the lens body, i.e. the boundary of the first out-of-focus control region and the second out-of-focus control region is symmetrical in any opposite radial direction centered on the preset point on the lens body, and the contact lens is adapted to the lens body behind the cornea with the preset point offset from the cornea center. Then, after fitting the contact lens to the cornea, since the preset point of the lens body is deviated from the cornea center, in fact, there may be at least one pair of opposite radial directions centered on the fitted cornea center, and the boundaries of the first defocus control region and the second defocus control region are asymmetric. Referring to fig. 4, fig. 4 is a schematic diagram of a contact lens provided in a further embodiment, which shows a preset point O 'on the lens body, the boundary 13 of the first out-of-focus control region and the second out-of-focus control region is symmetrical in any pair of opposite radial directions centered on the point O', and after the contact lens is fitted to the cornea, the point O 'of the lens body is offset from the point O' of the fitted cornea.
Optionally, the preset point on the lens body may be the center of the lens body, that is, the boundary of the first out-of-focus control area and the second out-of-focus control area of the lens body in the contact lens is symmetrical in any pair of opposite radial directions with respect to the center of the lens body.
The contact lens of the embodiment can adopt the existing contact lens which is strictly and radially symmetrical about the corneal center, and the contact lens center is deviated from the adapted corneal center. In addition, in the optical design process of the contact lens, the contact lens required by the embodiment can be obtained by integrally translating the optical structure of the existing contact lens which is strictly radially symmetrical about the corneal center on the lens body, so that the optical center of the contact lens is offset from the center of the lens body.
Optionally, in specific implementation, the minimum distance between the boundary of the first defocus control area and the second defocus control area to the center of the adapted cornea is greater than or equal to a first preset value, and the maximum distance is less than or equal to a second preset value, and the corneal contact lens is required to achieve the required control effect on the optical defocus amount of the eye by limiting the distance between the boundary of the two defocus control areas of the lens body to the center of the adapted cornea. Illustratively, in a specific example, the minimum distance from the boundary of the first out-of-focus control area and the second out-of-focus control area of the corneal contact lens to the center of the adapted cornea is greater than or equal to 0.6mm, and the maximum distance is less than or equal to 5mm.
The first defocus control area of the contact lens of the present embodiment is used to eliminate the optical defocus of the corresponding area of the adapted cornea, such as to eliminate the myopia degree of the adapted eyeball. The second defocus control area is used for increasing the myopic optical defocus amount of the corresponding area of the adapted cornea. The method is used for enabling the matched eyeball to achieve a better visual effect.
Optionally, the second defocus control area of the lens body may have the same refractive power at each position, and each position of the second defocus control area has the same refractive power. Alternatively, the second defocus control area of the lens body may include a plurality of zones, and the refractive power of each zone is different, and each zone of the second defocus control area may adopt different shapes of optical interfaces or different refractive indexes, respectively, to achieve the change of the optical defocus amount of the corresponding area of the adapted posterior corneal.
In one embodiment, the experiment is performed using an existing contact lens, i.e., a contact lens having an optical structure that is radially symmetric about the center of the lens, also commonly referred to as an Orthokeratology lens (Orthokeratology). Specifically, by means of a wide-area retinal diopter detection technology, peripheral retinal diopter distribution states of a group of myopia children are measured before wearing glasses and in a month of Dai Jinghou.
1 method of experiment
1.1 Subjects and methods
Inclusion exclusion criteria for subjects included the following: 1) Age 8-17 years; 2) Equivalent spherical power > -6D; 3) Astigmatism < -1.5D; 4) Best corrected vision >0.8 (decimal); 5) Average corneal curvature of 40-46D; 6) No general immune disease or history of eye surgery and trauma, and no history of corneal contact lens application.
A total of 23 effective subjects were included in the study, with 60.9% male, 39.1% female, mean age 11.8 + -2 years, mean myopia degree-3.29 + -0.99D, ranging from-1.67D to-5.36D. All subjects had passed examination of slit lamps, tear film break-up time, corneal topography, etc. prior to fitting of the reshaped lens to ensure compliance with the requirements of enrollment, and were fitted with corneal reshaped lenses after enrollment (Alpha Corporation, nagoya, japan) with the optician informed that daily wear should be no less than 8 hours.
Before and one month after the glasses are worn, the wide-area retinal power detection method is adopted to obtain the peripheral refractive power of a rectangular area surrounded by 20 degrees of the upper side, 16 degrees of the lower side, 30 degrees of the nasal side and 30 degrees of the temporal side of the retina.
1.2 data analysis
And carrying out related data analysis and statistics by adopting Matlab software. The x-axis of the retinal refractive topography represents the horizontal azimuthal viewing angle, with positive values representing nasal/temporal vision and negative values representing temporal/nasal vision; the y-axis represents the viewing angle in the vertical orientation, with positive values indicating superior/inferior vision and negative values indicating inferior/superior vision in degrees. The grayscale of the topographic map represents the refractive power in units of D. The origin of coordinates represents the origin of the visual axis/fovea macula. Since peripheral refractive changes occur mainly in regions other than 20 ° of the peripheral retina, referring to fig. 5, the present study divides the region other than 20 ° in radius into 8 regions with r =25 ° and y =0 ° in the periphery of the topographic map, and calculates the mean value of the diopters of each region of the individual as the representative value of the region. The four peripheral regions of the upper retina, in order from the temporal side to the nasal side, were designated UZ1, UZ2, UZ3, UZ4; the four peripheral regions of the lower retina were named LZ1, LZ2, LZ3, LZ4 in order from the temporal side to the nasal side.
After the subjects worn the OK-glasses for one month, the subjects were divided into a central group and an eccentric group according to the corneal anterior surface tangent ametropa. Finally, 14 subjects with better lens positioning were assigned to the central group and 7 subjects with relatively poor lens positioning were assigned to the off-set group. The 2 subjects were not included in the stratification analysis because corneal topography lens positioning was difficult to judge. A rectangular coordinate system is established by taking the corneal vertex as the center, the x axis positive represents the nose side position, the x axis negative represents the temporal side position, the y axis positive represents the upper side, and the y axis negative represents the lower side. The deviation of the center of the treatment area of the centering group in the horizontal direction is-0.2 +/-0.23 mm, and the deviation in the vertical direction is-0.4 +/-0.26 mm; the center of the treatment area of the deflection group has a deflection of-0.85 + -0.26 mm in the horizontal direction and a deflection of-0.43 + -0.16 mm in the vertical direction. The deviation range of all the testees in the horizontal direction is-1.19-0.4 mm; the deviation range of the centering group in the horizontal direction is-0.4 mm; the offset range of the offset group in the horizontal direction is-1.19 to-0.51 mm. The subject in the central group had a computer vision of-3.42 + -1.12D and the group of-3.13 + -0.82D when they participated in the test, and dropped to-1.02 + -0.74D and-0.79 + -0.58D, respectively, after the OK mirror was fitted.
The positioning center was determined by a high-tech OK lens dispenser, considering the positions of the treatment area (the area where the corneal power decreases after 1 month of lens application) and the reversal area (the inner side of the annular area where the corneal power increases after one month of lens application).
1.3 optical modeling
In order to better understand the relationship between the deviation of the orthokeratology lens and the orthokeratology lens, optical path tracking software (Zemax, radial Zemax, usa) is used to simulate the peripheral defocus state of the orthokeratology lens before and after application. A toroidal lens (inner diameter 6.4mm and outer diameter 8 mm) with the refractive power of 2D is added on the anterior surface of the cornea of the Navarro emmetropia model so as to simulate the relative myopic defocusing change caused by an inverted arc area after a myopic child wears OK glasses. In the simulation software, the wavelength of light was 780nm, and the pupil diameter was 3mm. With 0.05mm as an interval, the computer simulates the peripheral defocusing state under the condition of 0-1.5 mm of deviation.
2 results of the experiment
2.1 defocus state of peripheral retina before and after wearing orthokeratology mirror
Referring to fig. 6 (a), 6 (b) and 6 (c), fig. 6 (a) is a relative peripheral retinal refractive topographic map before fitting, fig. 6 (b) is a relative peripheral retinal refractive topographic map after fitting, and fig. 6 (c) is a relative peripheral retinal refractive topographic map difference map (after fitting-before fitting).
Referring to fig. 7 (a), 7 (b) and 7 (c), fig. 7 (a) is a relative peripheral retinal refractive topographic map before fitting, fig. 7 (b) is a relative peripheral retinal refractive topographic map after fitting, and fig. 7 (c) is a relative peripheral retinal refractive topographic map difference map (after fitting-before fitting). And comparing the refraction distribution of the symmetrical regions by adopting a paired t test, such as UZ2 vs UZ3 and UZ2 vs LZ2, wherein a one-way arrow indicates that the symmetrical regions have statistical difference, and a two-way arrow indicates that the symmetrical regions have no statistical difference.
3.2 relative peripheral retinal refractive topography under different deviation conditions
Referring to fig. 8 (a) and 8 (b), the upper graph of fig. 8 (a) is a relative peripheral retinal refractive topographic map before central group fitting, the middle graph of fig. 8 (a) is a relative peripheral retinal refractive topographic map after central group fitting, and the lower graph of fig. 8 (a) is a relative peripheral retinal refractive topographic map difference map before and after central group fitting (after fitting-before fitting). The upper graph of fig. 8 (b) is a relative peripheral retinal refractive topographic map before the glasses are worn in the deviated set, the middle graph of fig. 8 (b) is a relative peripheral retinal refractive topographic map after the glasses are worn in the deviated set, and the lower graph of fig. 8 (b) is a difference graph of the relative peripheral retinal refractive topographic map in the deviated set (after the glasses are worn and before the glasses are worn). Wherein, the asterisk (—) indicates that the middle group and the offset group have statistical differences in the corresponding regions.
3.3 computer-simulated relative peripheral defocus disparity topographic map of centered and offset groups
Referring to fig. 9 (a) and 9 (b), fig. 9 (a) is a map of the topographic map of defocus of the peripheral retina relative to the central group (average deviation-0.2 mm), and fig. 9 (b) is a map of the topographic map of defocus of the peripheral retina relative to the offset group (average deviation-0.85 mm).
Referring to fig. 10 (a) and 10 (b), fig. 10 (a) is a graph of the relative peripheral defocus difference of the central horizontal meridian of the retina in the central group (average offset-0.2 mm), and fig. 10 (b) is a graph of the relative peripheral defocus difference of the central horizontal meridian of the retina in the offset group (average offset-0.85 mm). Where the solid line 1 is the measured value of the study in the human eye, the solid line 2 is the computer simulated value, and the dotted line is the peripheral defocus distribution of the Navarro emmetropic eye model without any intervention.
Referring to fig. 11 (a) and 11 (b), fig. 11 (a) is a diagram illustrating a change of a temporal central retinal horizontal meridian moving a contact lens to the temporal side by a computer simulation, and fig. 11 (b) is a diagram illustrating a change of a temporal central retinal horizontal meridian moving a contact lens to the temporal side by a computer simulation.
4 summary of the invention
Through the experimental research, the corneal contact lens can cause the asymmetrically changed relative myopic optical defocus in the peripheral horizontal direction, the retina beyond 20 degrees of the temporal side is taken as the main (the relative myopic defocus of about 3D), and the ipsilateral astigmatism and the higher-order aberration are also obviously improved. After the subjects were further divided into a centered group (treatment zone center off the corneal vertex ≦ 0.5 mm) and an offset group (treatment zone center off the corneal vertex >0.5 mm) by corneal topography, the results showed that the offset group had significantly increased myopic optical defocus in the temporal retina, with similar results obtained after computer simulation of different degrees of offset. The result shows that the peripheral retina myopic optical defocus caused by the corneal contact lens can be obviously increased due to the offset of the lens, so the corneal contact lens (comprising an OK lens, a soft corneal contact lens, a hard corneal contact lens and the like) which is designed by the asymmetric peripheral defocus of the technical scheme can play a more obvious and stable myopia control effect.
The present invention provides a contact lens, which is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A contact lens comprising a lens body including a first defocus control area and a second defocus control area for changing an optical defocus amount of a corresponding area of an adapted cornea, respectively, the second defocus control area surrounding the first defocus control area, boundaries of the first defocus control area and the second defocus control area being asymmetric in at least one pair of opposite radial directions centered on a center of the adapted cornea;
the first out-of-focus control area is used for eliminating the optical out-of-focus amount of the corresponding area of the adapted cornea, and the second out-of-focus control area is used for increasing the myopic optical out-of-focus amount of the corresponding area of the adapted cornea.
2. The contact lens of claim 1, wherein the asymmetry of the boundaries of the first out-of-focus control zone and the second out-of-focus control zone in a pair of opposing radial directions centered on the adapted corneal center comprises: the distances from the boundary to the center of the first defocus control area and the second defocus control area in a pair of opposite radial directions centered on the adapted cornea center are not uniform.
3. The contact lens of claim 1, wherein the at least one pair of opposing radial directions comprises a pair of radial directions parallel to a direction in which the adapted cornea points from the nasal side to the temporal side.
4. The contact lens of claim 1, wherein the boundaries of the first out-of-focus control zone and the second out-of-focus control zone are symmetric about a preset axis, the preset axis being an axis parallel to the direction in which the adapted cornea points from the nasal side to the temporal side and passing through the center of the adapted cornea.
5. The contact lens of claim 1, wherein the boundaries of the first out-of-focus control zone and the second out-of-focus control zone are symmetric in any pair of opposing radial directions centered on a predetermined point on the lens body from which the contact lens is adapted to be offset after a cornea.
6. The contact lens of claim 5, wherein the predetermined point is the center of the lens body.
7. The contact lens of claim 1, wherein the minimum distance from the boundary of the first defocus control area and the second defocus control area to the center of the cornea after fitting is greater than or equal to a first preset value, and the maximum distance is less than or equal to a second preset value.
8. A contact lens according to any of claims 1 to 7, wherein the boundaries of the first out-of-focus control zone and the second out-of-focus control zone are circular or elliptical.
9. A contact lens according to any one of claims 1 to 7, wherein the refractive power at each location of the second defocus control region is uniform, or the second defocus control region comprises a plurality of zones with different refractive powers.
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| CN112612145B true CN112612145B (en) | 2022-10-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006139246A (en) * | 2004-10-15 | 2006-06-01 | Riverbell Kk | Multifocal lens and imaging system |
| US8894204B2 (en) * | 2010-12-17 | 2014-11-25 | Abbott Medical Optics Inc. | Ophthalmic lens, systems and methods having at least one rotationally asymmetric diffractive structure |
| CN102692730B (en) * | 2012-06-15 | 2013-12-04 | 戴明华 | Multi-element lens for controlling defocus and eye diopter and application thereof |
| CN103777368B (en) * | 2014-01-16 | 2018-09-14 | 段亚东 | A kind of wide visual field myopic peripheral defocus spectacle lens |
| US9778487B2 (en) * | 2015-08-26 | 2017-10-03 | Johnson & Johnson Vision Care, Inc. | Rotationally stabilized contact lens with improved comfort and method of optimization |
| US9977257B2 (en) * | 2016-03-22 | 2018-05-22 | Johnson & Johnson Vision Care, Inc. | Multifocal lens design and method for preventing and/or slowing myopia progression |
| CN105974605A (en) * | 2016-05-10 | 2016-09-28 | 段亚东 | Four-quadrant area ambitus out-of-focus corneal contact lens |
| CN105785589A (en) * | 2016-05-10 | 2016-07-20 | 段亚东 | Four-quadrant-region peripheral out-of-focus frame glasses lens |
| RU2016124757A (en) * | 2016-06-22 | 2017-12-27 | Рашид Адыгамович Ибатулин | DEVICE FOR PREVENTION AND / OR TREATMENT OF REFRACTIONAL VISION DISORDERS |
| TWM556863U (en) * | 2017-11-17 | 2018-03-11 | Brighten Optix Corp | Aspherical myopia control lens with peripheral defocus |
| US20200110281A1 (en) * | 2018-05-31 | 2020-04-09 | Brighten Optix Corp. | Lens with asymmetric optical zone to increase defocus image area |
| CN108957789A (en) * | 2018-09-28 | 2018-12-07 | 戴明华 | Prevent visual field asymmetry from leading to the spectacle lens and therapeutic equipment of dioptric deterioration and visual fatigue |
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