CN112987339A - Concentric annular soft and hard combined corneal contact lens - Google Patents
Concentric annular soft and hard combined corneal contact lens Download PDFInfo
- Publication number
- CN112987339A CN112987339A CN202110170001.0A CN202110170001A CN112987339A CN 112987339 A CN112987339 A CN 112987339A CN 202110170001 A CN202110170001 A CN 202110170001A CN 112987339 A CN112987339 A CN 112987339A
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- lens
- soft
- hard
- contact lens
- annular
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
- G02B1/043—Contact lenses
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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
- G02C7/049—Contact lenses having special fitting or structural features achieved by special materials or material structures
Abstract
The invention discloses a concentric annular soft and hard combined corneal contact lens, which comprises a hard lens in a rotator shape and a soft lens arranged on the inner side of the hard lens, wherein the curvature of the inner side surface of the hard lens is consistent with the curvature of a cornea of a patient, and diopter required by the patient is arranged on the outer side surface of the hard lens; the soft lens is an annular bulge array with the circle center at the center of the hard lens and arranged concentrically, a certain distance is arranged between the annular bulges for filling tears, and the curvature of the inner side of the soft lens is consistent with that of the surface of the inner side of the hard lens. When the concentric annular soft and hard combined corneal contact lens is worn on a cornea, the soft lens is in contact with the cornea, so that good wearing comfort is provided; tear liquid rings are formed between the annular bulges of the adjacent soft lenses, and are in contact with the hard lens with high oxygen permeability at the outer side for oxygen exchange, so that the optimal effect is achieved in the aspects of comfort and oxygen permeation.
Description
Technical Field
The invention belongs to the technical field of medical instruments, and particularly relates to a concentric annular soft and hard combined corneal contact lens.
Background
With the improvement of living standard of people, the use scene of the corneal contact lens is more and more common, the corneal contact lens is required to have good wearing comfort and oxygen permeability, and the corneal contact lens can be divided into a soft corneal contact lens and a hard corneal contact lens according to the material of the corneal contact lens. The soft corneal contact lens is made of a contact lens material with high water content and has strong hydrophilicity, so that the soft corneal contact lens is comfortable to wear and has no foreign body sensation; oxygen permeability mainly carries oxygen through free water in the lens, and due to the limitation of the overall design requirement of the lens, the water content of the contact lens cannot be improved without limit, so that the oxygen permeability is limited, and the soft lens is comfortable to wear, but the soft lens is easy to cause corneal oxygen deficiency after being worn for a long time, so that a series of adverse reactions and complications are caused, such as corneal epithelial injury, corneal edema, corneal neovascularization and the like; hard contact lenses have high oxygen permeability and are not easy to deform, but are less comfortable to wear, are prone to generating foreign body sensation, can cause lacrimation and conjunctival hyperemia, and particularly under the condition that the corneal sensitivity of children and teenagers is high, the hard contact lenses can not resist the strong foreign body sensation and can be rejected.
US3973838A discloses a contact lens comprising a rigid lens of a hard material in the form of a solid body of revolution and a soft edge of a hydrophilic material surrounding the rigid lens in the peripheral region thereof, through which tears can penetrate into the cavity between the rigid lens and the soft edge and the side of the eye, the rigid lens portion of the contact lens providing visual acuity and the soft lens portion providing comfort, but this design only improves the comfort of the soft edge of the cornea and does not significantly improve the rigid lens portion of the central zone.
Patent CN108095886A discloses a contact lens for treating glaucoma, which is a spherical crown type contact lens, and is mainly prepared from two parts, namely a soft layer and a hard layer, by a plane bonding process and a hot-press molding process, wherein the soft layer is located on the inner layer of the contact lens, and the hard layer is located on the outer layer of the contact lens. The hard layer is used to provide refractive correction and the soft layer provides comfort and administration by compression of the eyeball, although this design provides improved comfort to the cornea, the thickness of the double lens is increased and does not contribute to oxygen supply.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide a concentric annular soft and hard combined corneal contact lens which is comfortable to wear and has good oxygen permeability.
In order to achieve the purpose, the technical scheme is as follows:
a concentric ring combined hard and soft contact lens, comprising: a hard lens of a rotator shape and a soft lens arranged at the inner side of the hard lens,
the curvature of the inner side surface of the rigid lens is consistent with the curvature of the cornea of a patient so as to achieve a state of being approximately parallel to the front surface of the cornea, and diopter required by the patient is arranged on the outer side surface of the rigid lens so as to obtain an ideal diopter state and correct the vision of the patient;
the soft lens is an annular bulge array with the circle center in the center of the hard lens and arranged concentrically, a certain distance is arranged between the annular bulges for filling tears to form a tear liquid ring, and oxygen exchange is realized by the contact of the tear liquid ring and the hard lens with good oxygen permeability; the inner curvature of the soft lens is consistent with the inner surface curvature of the hard lens, namely the soft lens is completely matched with the surface of the cornea of a patient, and wearing comfort is provided.
As another preferable scheme of the invention, the central thickness of the hard lens is 0.1-0.4 mm so as to meet the correction requirements of patients with different degrees and types.
As another preferable scheme of the invention, the thickness of the soft lens is 20-40 μm, and the thickness of the tear film is 6-10 μm, so that the tear staying on the ocular surface is more than that before the lens is worn, and the dissolution amount of oxygen is increased; the width of the soft lens is 15-30 mu m, the interval between adjacent annular bulges of the annular soft lens is 30-60 mu m, the width ratio of the annular bulges of the annular soft lens to the tear liquid ring is 1:2, on the premise that the annular convex array of the annular soft lens supports the hard lens, the contact area between the tear liquid ring and the hard lens is increased as much as possible, and the oxygen permeability is improved.
As another preferable scheme of the present invention, the hard lens material is one of siloxane methacrylate, methyl methacrylate, fluorosilicone methacrylate, and fluorosilicone acrylate.
In another preferred embodiment of the present invention, the refractive index of the soft lens is 1.3 to 1.4, so that the refractive index of the soft lens is close to the refractive index of tear fluid 1.336, thereby avoiding the interference with the visual field due to the refractive power distinguishable by human eyes generated on the interface between the annular protrusion of the annular soft lens and the tear fluid ring.
In another preferred embodiment of the present invention, the soft lens material is poly (hydroxyethyl methacrylate) and has a refractive index of 1.398.
Compared with the prior art, the concentric annular soft and hard combined corneal contact lens provided by the invention has the following gain effects:
according to the concentric annular soft and hard combined corneal contact lens, the soft lens annular bulge arrays which are arranged concentrically and annularly are arranged on the inner side of the hard lens, so that when the corneal contact lens is worn on a cornea, the soft lens is in contact with the cornea, and good wearing comfort is provided; tears are filled between the annular bulges of the adjacent soft lenses to form a tear liquid ring, tear exchange occurs in the moment, and the tear liquid ring is in contact with the hard lens with high oxygen permeability at the outer side and performs oxygen exchange, so that the oxygen content of the tears on the surface of the cornea is ensured, and the optimal effect is achieved in the aspects of comfort and oxygen permeability; meanwhile, the soft lens is an annular convex array with a certain interval, so that the total weight of the corneal contact lens is reduced, and the central positioning of the corneal contact lens is facilitated.
Drawings
Fig. 1 is a schematic front view structure of a concentric ring soft and hard combined corneal contact lens, fig. 2 is a schematic rear view structure of the concentric ring soft and hard combined corneal contact lens, fig. 3 is a schematic sectional structure of the concentric ring soft and hard combined corneal contact lens, and fig. 4 is a schematic wearing diagram of the concentric ring soft and hard combined corneal contact lens.
Wherein: 1-hard lenses; 2-soft lenses; 3-tear ring; 4-cornea of patient.
Detailed Description
For a better understanding of the present invention, specific embodiments thereof are described in further detail below with reference to the accompanying drawings.
As shown in fig. 1-3, the concentric ring-shaped soft and hard combined contact lens provided by the invention comprises a hard lens 1 with a revolving body shape outside and a ring-shaped convex soft lens 2 arranged in a concentric ring shape inside the hard lens 1, wherein the curvature of the inner side surface of the hard lens 1 is consistent with the curvature of the cornea of a patient so as to achieve a state approximately parallel to the front surface of the cornea, and the diopter required by the patient is arranged on the outer side surface of the hard lens 1 so as to obtain an ideal diopter state and correct the vision of the patient; the central thickness of the corneal contact lens of a patient under the condition of myopia is 0.1-0.2 mm, and the central thickness of the corneal contact lens of the patient under the condition of hyperopia is 0.3-0.4 mm, so that the central thickness of the rigid lens 1 is set to be 0.1-0.4 mm, and the correction requirements of patients with different degrees and types are met; the hard lens 1 can be made of one of siloxane methacrylate, methyl methacrylate, fluorosilicone methacrylate and fluorosilicone acrylate, and has high oxygen permeability.
The soft lens 2 is an annular bulge array which is arranged in the center of the hard lens and is concentrically and annularly arranged, tears are filled between the annular bulges to form a tear liquid ring 3, oxygen exchange is realized through a contact interface of the tear liquid ring 3 and the hard lens 1, the thickness of the soft lens 2 is 20-40 mu m, and as the thickness of a tear film is 6-10 mu m, the thickness of the soft lens 2 is greater than that of the tear film, the tears staying on the surface of the eye are more than that before the hard lens is provided, so that the dissolution amount of the oxygen is increased; the width of the soft lens 2 is 15-30 mu m, the interval between the adjacent annular bulges of the annular soft lens 2, namely the width of the tear ring 3 is 30-60 mu m, so that the width ratio of the annular bulges of the annular soft lens 2 to the tear ring 3 is 1:2, on the premise of ensuring that the annular convex array of the annular soft lens 2 supports the hard lens 1, the contact area between the tear ring 3 and the hard lens 1 is increased as much as possible, and the oxygen permeability is improved. The inner curvature of the soft lens 2 is consistent with the inner surface curvature of the hard lens 1, namely, the soft lens is completely matched with the surface of the cornea of a patient and is responsible for providing wearing comfort.
The refractive index of the material of the soft lens 2 is selected to be 1.3-1.4, preferably the refractive index of the material of the soft lens is 1.398, so that the refractive index of the soft lens 2 is close to the refractive index of the tear fluid of 1.336, and the condition that the refractive power which can be distinguished by human eyes is generated on the interface between the annular bulge of the annular soft lens 2 and the tear fluid ring 3, so that the visual field is interfered is avoided.
As shown in fig. 4, when the concentric ring-shaped soft and hard combined contact lens provided by the invention is worn on the cornea 4 of a patient, the soft lenses 2 arranged in a ring shape are in contact with the cornea 4 of the patient, so that good wearing comfort is provided, and support is provided for the hard lenses 1; the tear ring 3 is arranged between the rigid lens 1 and the cornea 4 of the patient, the thickness of the tear ring 3 is larger than that of a single-layer tear film, the width ratio of the annular bulge of the annular soft lens 2 to the tear ring 3 is 1:2, the oxygen content of tears on the surface of the cornea is ensured, and the requirements of the corneal contact lens on wearing comfort and oxygen permeability are met simultaneously.
Because the hollow tear ring 3 is arranged between the annular convex arrays of the soft lens 2, the total weight of the corneal contact lens is reduced, and the wearing burden of a patient is reduced; the concentric annular array of annular protrusions on the soft lens 2 also facilitates the centering of the contact lens.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (6)
1. A concentric ring combined hard and soft corneal contact lens, comprising: a hard lens of a rotator shape and a soft lens arranged at the inner side of the hard lens,
the curvature of the inner side surface of the rigid lens is consistent with the curvature of the cornea of a patient, and diopter required by the patient is arranged on the outer side surface of the rigid lens;
the soft lens is an annular bulge array with the circle center at the center of the hard lens and arranged concentrically, a certain distance is arranged between the annular bulges for filling tears, and the curvature of the inner side of the soft lens is consistent with that of the surface of the inner side of the hard lens.
2. The concentric ring-shaped rigid-flexible contact lens of claim 1, wherein the rigid lens has a central thickness of 0.1-0.4 mm.
3. The concentric ring-shaped rigid-flexible contact lens as claimed in claim 1, wherein the thickness of the soft lens is 20-40 μm, the width is 15-30 μm, and the interval between the adjacent ring-shaped protrusions of the ring-shaped soft lens is 30-60 μm.
4. The concentric ring soft and hard combined corneal contact lens of claim 1, wherein the hard lens material is one of silicone methacrylate, methyl methacrylate, fluorosilicone acrylate.
5. The concentric ring shaped rigid-flexible contact lens of claim 1, wherein the refractive index of the soft lens is 1.3 to 1.4.
6. The concentric ring soft and hard contact lens of claim 1, wherein the soft lens material is poly (hydroxyethyl methacrylate).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110170001.0A CN112987339A (en) | 2021-02-07 | 2021-02-07 | Concentric annular soft and hard combined corneal contact lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110170001.0A CN112987339A (en) | 2021-02-07 | 2021-02-07 | Concentric annular soft and hard combined corneal contact lens |
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| Publication Number | Publication Date |
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| CN112987339A true CN112987339A (en) | 2021-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110170001.0A Pending CN112987339A (en) | 2021-02-07 | 2021-02-07 | Concentric annular soft and hard combined corneal contact lens |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217808A (en) * | 2012-01-18 | 2013-07-24 | 庄臣及庄臣视力保护公司 | Contact lens comprising fractal features for enhanced tear exchange |
| CN105629504A (en) * | 2016-03-25 | 2016-06-01 | 甘肃康视达科技集团有限公司 | Contact lenses with water and oxygen channel |
| CN112190229A (en) * | 2020-10-27 | 2021-01-08 | 华中科技大学同济医学院附属同济医院 | Intraocular pressure monitoring device for external rigid-internal soft double-layer corneal contact lens |
-
2021
- 2021-02-07 CN CN202110170001.0A patent/CN112987339A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217808A (en) * | 2012-01-18 | 2013-07-24 | 庄臣及庄臣视力保护公司 | Contact lens comprising fractal features for enhanced tear exchange |
| CN105629504A (en) * | 2016-03-25 | 2016-06-01 | 甘肃康视达科技集团有限公司 | Contact lenses with water and oxygen channel |
| CN112190229A (en) * | 2020-10-27 | 2021-01-08 | 华中科技大学同济医学院附属同济医院 | Intraocular pressure monitoring device for external rigid-internal soft double-layer corneal contact lens |
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Application publication date: 20210618 |
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| RJ01 | Rejection of invention patent application after publication |