TWI595286B - Continuous zoom contact lenses - Google Patents

Description

Continuous zoom contact lens

The present invention relates to a pair of glasses, and more particularly to a contact lens.

Referring to Fig. 1, the eye 9 of the myopic patient is imaged in front of the retina 91 for a distant scene, so that a clear image cannot be formed on the retina 91. However, referring to FIG. 2, when the eye 9 of the myopic patient wears a myopic contact lens 8 which is a concave lens, the distant scene is corrected on the retina 91 via the correction of the myopia contact lens 8.

When the above-mentioned myopia patient confirms the degree of myopia, the distance vision measurement is used to find the myopia contact lens 8 which can correct the vision of the myopic patient. For example, the measured myopia contact lens 8 can make the myopia patient correct. After the visual acuity of 1.0, you can see the scenery at a distance of five meters.

However, myopia patients spend most of their time wearing myopia contact lenses 8 configured with the above-mentioned remote measurement, watching the screens of electronic devices such as tablets, mobile phones, computers, etc. for a long time, or reading books and magazines for a long time. In fact, the eye 9 wearing the myopic contact lens 8 is visually imaged at the distance correction to see a close-up picture, thereby producing hyperopic defocus in the periphery of the retina (Hyperopia) Defocus), in this way, the eye 9 produces a clear visual image for correct focus, and the ciliary muscle 92 of the eye 9 must continue to shrink and tighten the liquid crystal 93 to focus, which will cause the ciliary muscle 92 痉挛 to temporarily lose the ability to relax, thereby Forming pseudomyopia. If this state is maintained for a long period of time, the iliac crest of the ciliary muscle 92 may also stimulate the elongation of the eye axis of the eye 9, thereby forming an irreversible true myopia, resulting in a deepening of the degree of myopia.

Referring to FIG. 3 and FIG. 4, in order to solve the problem of looking at the above-mentioned single-focus contact lens, a multi-focus contact lens 7 having a plurality of focal regions 71 and 72 having different refractive powers is available for realizing a near view. You can also see the effect of far. However, the biggest problem with the multifocal contact lens 7 is that the wearer looks at the different focus areas 71, 72 of the multifocal contact lens 7 when looking at the distance, in order to achieve a near-distance transition, so different focus The degree of diopter between the regions 71 and 72 is a sudden change in jitter. Some wearer's eyes 9 cannot adapt to the above-mentioned violent changes in the diopter, which may cause imaging jumps and blurring, and also have a spectroscopic phenomenon, resulting in a decrease in visual contrast. Long-term wear and use of the wearer is prone to dizziness or maladaptation.

Accordingly, it is an object of the present invention to provide a continuous zoom contact lens that corrects for ocular refractive abnormalities and corrects the imaging focus position of the periphery of the retina.

Thus, the continuous zoom contact lens of the present invention comprises: a central optical zone, and a peripheral zone.

The central optical zone includes a first optical zone and a second optical zone, the first optical zone is a circular area surrounded by a central optical axis of the continuous zoom contact lens and having a radius of 1.5±1.0 mm. . The second optical zone extends radially outward from the periphery of the first optical zone to the peripheral zone.

The refractive power of the continuous zoom contact lens is continuously changed in the radial direction, and the average rate of change of the refractive power is 0.25 D/mm or less in the first optical zone and 0.25 D/mm or more in the second optical zone.

The effect of the invention is that the continuous zoom contact lens can correct the refractive error of the eyeball by continuously changing the refractive power of the first optical zone and the second optical zone in the radial direction, and solve the problem that the conventional multifocal contact lens has imaging The phenomenon of jumping or splitting causes the wearer to have problems such as dizziness or maladaptation, and at the same time corrects the focus position of the peripheral area of the retina to effectively relieve the pressure on the eyes.

7‧‧‧Multifocal contact lenses

93‧‧‧Cell crystal

71‧‧‧Focus area

94‧‧‧ cornea

72‧‧‧Focus area

1‧‧‧Continuous zoom contact lenses

8‧‧‧Myopia contact lenses

11‧‧‧Center Optical Zone

9‧‧‧ eyes

111‧‧‧First optical zone

91‧‧‧Retina

112‧‧‧Second optical zone

911‧‧‧ Macular fovea

12‧‧‧The surrounding area

912‧‧‧around range

L‧‧‧ central optical axis

92‧‧‧Ciliary muscle

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a schematic diagram illustrating an imaging aspect of a myopic patient's eye; 2 is a schematic view showing an imaging state of the myopic patient's eye after wearing a myopic contact lens; FIG. 3 is a plan view showing a partitioned state of a conventional multifocal contact lens; FIG. 4 is a schematic view , indicating that the eye uses the respective regions for focusing imaging at different distances when wearing the multifocal contact lens; FIG. 5 is a schematic plan view showing the partitioning pattern of the continuous zoom contact lens of the present invention; FIG. 6 is a side view showing When a wearer wears the continuous zoom contact lens of the present invention, the regions of the continuous zoom contact lens are in a focused imaging state; FIG. 7 is a refractive index distribution diagram of Embodiment 1 of the continuous zoom contact lens of the present invention; Is a refractive index profile of Embodiment 2 of the continuously zoom contact lens of the present invention; and FIG. 9 is a refracting power distribution diagram of Embodiment 3 of the continuous zoom contact lens of the present invention.

The invention relates to a continuous zoom contact lens, which can correct the refractive error of the eyeball by continuously changing the refractive index in the radial direction, and solve the problem that the conventional multifocal lens has an image jumping image or a spectroscopic phenomenon, so that the wearer has dizziness Or maladaptive The problem of the reaction, and at the same time correct the focus position of the imaging of the periphery of the retina, so as to effectively relieve the pressure on the eye.

The center of vision of the eye is more sensitive and precise than the peripheral vision. There is a small depression about 0.2mm in diameter near the center of the retina, called the macular fovea (also known as the macula), which is the most sensitive part of the vision. The visual center of the eye. The visual acuity of the surrounding area around the macula is significantly reduced. When the angle of view is 5 degrees away from the visual axis, the resolution is reduced to one-third of the central value of the macula. However, since the cornea in the vicinity of the central portion of the cornea is spherical, the remaining peripheral regions are not spherical. If the refractive power of the contact lenses is the same, when the eyes are far away, the light is like a parallel light. After the crystal is refracted, it is projected into the fovea of the macula. The ciliary muscle relaxes for a long time and looks far away. It does not cause eye fatigue. On the contrary, if you look at close objects for a long time, the ciliary muscles force, although the close objects are clear, However, the imaging focus located in the periphery of the retina does not fall on the retina, forming a far-sighted defocus. At this time, in order to obtain better imaging, the eye forces the ciliary muscle to adjust the curvature of the crystal and increase the burden. Therefore, the present invention makes it possible to correct the refractive error of the eyeball by continuously changing the refractive index of the contact lens in the radial direction, and to solve the imaging phenomenon or spectroscopic phenomenon of the conventional multifocal contact lens, so that the wearer is dizzy or adapted. Problems such as poor side effects, and at the same time correcting the focus of imaging around the retina.

Referring to Figures 5 and 6, the continuous zoom contact lens 1 of the present invention comprises a central optical axis L, a central optical zone 11, and a radially outward extending direction from the central optical zone 11. The surrounding area is 12. Wherein, the central optical zone 11 is a visible area for providing corrective vision, and has a refractive power in the structural design for correcting the vision, and the structural design of the peripheral zone 12 is for increasing the proper matching of the continuous zoom contact lens 1. The wearing area allows the continuous zoom contact lens 1 to stably conform to the cornea 94 on the wearer's eye 9. Since the peripheral zone 12 is a non-primary visual zone, the peripheral zone 12 may be designed without vision. Clear effect.

The central optical zone 11 includes a first optical zone 111 and a second optical zone 112. The first optical zone 111 is a circular area surrounded by the central optical axis L of the continuous zoom contact lens 1 and surrounded by a radius of 1.5 ± 1.0 mm. The base curve (BC) of the first optical zone 111 has a radius of curvature of 8.0 to 9.0 mm, a conic constant (K) greater than 0, and the refractive power continuously changes outward in the radial direction, and the center is The optical axis L is an axisymmetric center, and the average refractive index of the radial refractive power is 0.25 D/mm or less. Preferably, the average rate of change is less than 0.125 D/mm. When the wearer's eye 9 is wearing the continuous zoom contact lens 1 and looking into the distance, the distant scene is refraction corrected by the first optical zone 111 and imaged on the macula fove 911 of the retina 91. The initial refractive power of the first optical zone 111 is adjusted according to the needs of the wearer. If the wearer is a myopic patient, the refractive power suitable for the patient is used as a starting value.

The second optical zone 112 extends outward from the first optical zone 111, and the outer edge is spaced from the central optical axis L of the continuous zoom contact lens 1 by a distance of less than 4 mm. Preferably, it is 2.5 to 3.5 mm. However, the distance between the second optical zone 112 and the central optical axis L is greater than 4 mm, and still does not affect the entire visible range, that is, the entire visible area of the central optical zone 11 and It is not affected. Therefore, the distance between the second optical zone 112 and the central optical axis L is less than the radius of 4 mm, and is not limited to be absolutely smaller, but generally does not exceed the radius of 4 mm in the visible region of the human eye, if the continuous zoom The design of the contact lens 1 outside the viewable area has a refractive power, which obviously only increases the labor cost. The refractive power of the second optical zone 112 continuously changes outward in the radial direction, and the central optical axis L is an axisymmetric center, and the average rate of change of the radial refractive power is 0.25 D/mm or more, preferably. Ground, the average rate of change of radial diopter is greater than 0.5 D/mm. The continuous zoom contact lens 1 transmits the refractive power of the second optical zone 112, that is, the refractive power of the second optical zone 112 is greater than the refractive power of the first optical zone 111, and the second optical zone 112 is The average rate of change of the diopter is greater than the average rate of change of the refracting illuminance of the first optical zone 111, such that the imaged focus corrected by the refraction of the subject via the second optical zone 112 falls before the peripheral extent 912 of the retina 91, producing a near vision The coke, so that the ciliary muscle 92 does not need to exert excessive force when the object is close to the object, so that the curvature of the crystal lens 93 becomes smaller to adjust the focus, and the eye can effectively relieve the pressure. It is worth mentioning that the above numerical ranges of 0.25 D/mm or less and 0.25 D/mm or more are defined, that is, respectively mean less than or equal to (not more than) 0.25 D/mm and greater than or equal to (not less than) 0.25 D/mm.

In the practical design, although the average refractive index change rate of the first optical zone 111 is not more than 0.25 D/mm, it is not limited to the range of the first optical zone 111, and must be gradually increased, and may be incremented and then decremented. The design only needs to control the average rate of change of the refractive power to be no more than 0.25 D/mm. Similarly, the second optical zone 112 is also the same. However, in the preferred implementation, the refractive index of the first optical zone 111 will gradually increase from the central optical axis L as a starting point, and the second optical zone is considered. The diopter of 112 continues the grading of the first optical zone 111. More preferably, the gradation of the first optical zone 111 is lower than the gradual increase of the diopter of the second optical zone 112.

The peripheral region 12 extends outwardly from the outer edge of the second optical zone 112, and the outer edge of the peripheral zone 12 is at a distance no greater than a radius of 8.0 mm from the central optical axis L of the continuous zoom contact lens 1.

By establishing the initial refractive power of the first optical zone 111 and the refractive index change rate of both the first optical zone 111 and the second optical zone 112 of the continuous zoom contact lens 1, the existing manufacturing method can be used. The continuous zoom contact lens 1 of the present invention is manufactured. The conventional manufacturing method may, for example, be a method such as press molding, rotary molding, or turning forming. There is no limitation on the manufacturing method of the continuous zoom contact lens 1 used in the present invention, and the material is not limited. The material may be exemplified by, but not limited to, 2-Hydroxyethyl methacrylate (HEMA) and methacrylic acid ( Methacrylic acid, MAA) copolymer, hydrophilic water gel (Hygrogel), hydrophobic water gel (Silicone hydrogel), hard high oxygen oxyfluoride fluoropolymer, etc.

When the wearer's eye 9 is wearing the continuous zoom contact lens 1 and looking at the close object, the scene adjacent to the central optical axis L is refraction corrected and imaged on the macula fove 911 of the retina 91 via the first optical zone 111, A scene that is farther from the central optical axis L is refracted and corrected to the peripheral extent 912 of the retina 91 via the second optical zone 112 of the continuous zoom contact lens 1 because the second optical zone 112 has a larger than the first optical The diopter design of the region 111 is such that imaging of the scene through the second optical zone 112 falls in front of the peripheral extent 912 of the retina 91, forming a near-sighted defocus, thereby allowing the ciliary muscle 92 to be over-stressed without the need for excessive force. The curvature is reduced to adjust the focus, and the eye 9 can achieve effective relief pressure.

When the continuous zoom contact lens 1 satisfies the refractive power of the second optical zone 112, it increases in a radial direction with a positive value, and the refractive power at the periphery of the second optical zone 12 and the diopter at the central optical axis L Under the condition that the difference of degrees is not more than 1.5D, the imaging on the retina 91 is clear enough when the object is close, and it is more effective to reduce the tight contraction of the ciliary muscle 92 to reduce the long-term close-up gaze. The fatigue caused can relieve the burden on the eyes 9.

By adjusting the change in the refractive power of the second optical zone 112, the increase in myopia in children can also be effectively alleviated. The reason is that children's eyes are mostly hyperopia, and the axis of the eye will continue to grow during development and gradually develop toward general vision. In the above eye axis In the process of growth, if a conventional single-focus lens is used for myopia correction and the scene is viewed at a close distance for a long time, the eye axis of the child's eye is likely to be excessively elongated, thereby causing myopia. Therefore, adjusting the diopter change pattern of the second optical zone 112 of the continuous zoom contact lens 1 can effectively improve the aforementioned problem, that is, the refracting degree of the second optical zone 112 is increased radially outward by a positive value. The average change rate of the refractive power of the second optical zone 112 is greater than 0.75 D/mm, which can effectively slow the increase of myopia when the child wears the corrected vision.

By adjusting the initial refractive power of the first optical zone 111 of the continuous zoom contact lens 1 and adjusting the diopter change of the continuous zoom contact lens 1 as a whole, it is suitable for wearing by a presbyopic patient. The adjustment is such that the first optical zone 111 has a zero or negative refractive power to accommodate the wearer's front or near vision for viewing a distant scene and the refracting edge of the second optical zone 112 The radial outward increases with a positive value and increases to the wearer's farsightedness so that the wearer can view the mid-range and close-range scenes.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the preferred embodiments of the invention, reference should be made to the

[Example 1]

Referring to FIG. 5, FIG. 6, and FIG. 7, the continuous zoom contact lens 1 of Embodiment 1 of the present invention is suitable for the design of a pressure-reducing lens for relieving the burden of close-eye gaze of the eye 9. The continuous zoom contact lens 1 is formed by HEMA water gel by UV light irradiation, and comprises the center axis L of the continuous zoom contact lens 1 as a center and defined by a radius of 1.5 mm, 3 mm and 7.1 mm, respectively. A first optical zone 111, a second optical zone 112, and a peripheral zone 12. The second optical zone 112 extends outwardly from an outer edge of the first optical zone 111, the peripheral zone 12 extending outwardly from an outer edge of the second optical zone 112. The thickness of the central optical axis L of the continuous zoom contact lens 1 is 0.08 mm, the radius of curvature of the base arc of the first optical zone 111 is 8.6 mm, and the conic constant (K) is 0.3, the starting of the first optical zone 111 The initial refractive power is -3.0D, the average change rate of the refractive power of the first optical zone 111 in the radial direction is +0.125D/mm, and the average refractive change of the second optical zone 112 in the radial direction is radially outward. The rate is +0.875 D/mm, and the degree of diopter at the edge of the second optical zone 112 to the radius of 3 mm is -1.5 D.

Through the aspherical and continuous zoom design of the first optical zone 111 and the second optical zone 112, the continuous zoom contact lens 1 can avoid the jump image or the spectroscopic phenomenon caused by the discontinuous step change of the multifocal contact lens. The resulting blurred image or maladaptive phenomenon occurs.

Moreover, the change in the degree of refracting of the first optical zone 111 is such that it does not affect the imaging quality of the spot at the fovea 911, and the diopter is increased radially outward from the range of the second optical zone 112. When the radius is 3mm, the degree of diopter has reached -1.50D, so that the imaging focus of the peripheral range 912 of the retina 91 is earlier, resulting in myopic defocus, thereby slowing the tightness of the ciliary muscle 92 due to the curvature of the adjustment of the crystal 93. Stretch Degree, effectively reducing the load on the eye 9. It is worth mentioning that the difference between the refractive power of the continuous zoom contact lens 1 at a distance equal to the radius 3 mm from the central optical axis L and the refractive power at the central optical axis L is greater than 1.5D, resulting in excessive myopia. The focus affects the image quality, so if the difference between the refracting degree at the center optical axis L equal to the radius of 3 mm and the diopter at the central optical axis L is not more than 1.5D, the image quality and relaxation will be achieved at the same time. The effect of the ciliary muscle 92 effectively solves the long-term near-eye fatigue problem of most of the currently worn spherical contact lenses.

[Embodiment 2]

Referring to FIG. 5, FIG. 6 and FIG. 8, Embodiment 2 of the present invention is suitable for slowing down myopia in children, which is substantially the same as that of Embodiment 1, except that the continuous zoom contact lens 1 is made of Silicone Hydrogel. The first optical zone 111, the second optical zone 112, and the peripheral zone 12 are centered on the central optical axis L and are surrounded by a radius of 1.0 mm, 3.0 mm, and 7.0 mm, respectively. The first optical zone 111 has a base arc curvature radius of 8.5 mm and a conic constant (K) of 0.8, and the first optical zone 111 has a starting refractive power of -3.0 D, and the first optical zone 111 has a refractive index edge. The average rate of change from the radially outward direction is +0.125 D/mm, and the average change rate of the refracting radiance of the second optical zone 112 in the radial direction is +1.50 D/mm, and the peripheral optical zone 112 is at the edge of the radius of 3 mm. The diopter is +0.125D.

The continuous zoom contact lens 1 can avoid the conventional multifocal contact lens through the aspherical and continuous zoom design of the first optical zone 111 and the second optical zone 112. A blur image phenomenon caused by a jump image or a spectroscopic phenomenon caused by a discontinuous stepwise sharp change, and the average change rate of the second optical zone 112 through the radial direction of the refracting mirror is greater than +0.75 D/mm. An imaging design capable of producing a myopic defocusing of the peripheral range 912 of the retina 91 to improve the design of the far-sighted defocus of the periphery of the retina caused by the general frame glasses and the spherical contact lens, thereby causing physiological stimulation of the growth of the axon, The eye axis of the child's eye is prevented from being excessively elongated, so that the second embodiment can control the growth of myopia and correct the refractive error of the child.

[Example 3]

Referring to FIG. 5, FIG. 6, and FIG. 9, the embodiment 3 of the present invention is suitable for the continuous zoom contact lens 1 of the presbyopic patient, which is substantially the same as the first embodiment except that the continuous zoom contact lens 1 is made of water glue. (Hygrogel) is subjected to polymerization molding by UV light irradiation, and the first optical zone 111, the second optical zone 112, and the peripheral zone 12 are centered on the central optical axis L and have a radius of 1.0 mm, 3.0 mm, and 7.0 mm, respectively. Around the definition, the initial refractive power of the first optical zone 111 is zero, and the average change rate of the refractive power of the first optical zone 111 in the radial direction is +0.25 D/mm, and the second optical zone 112 The average rate of change of the diopter in the radial direction is +1.0 D/mm, and the degree of diopter at the edge of the second optical zone 112 to the radius of 3 mm is +2.5 D.

Through the aspherical and continuous zoom design of the first optical zone 111 and the second optical zone 112, the continuous zoom contact lens 1 can avoid the jump image or the spectroscopic phenomenon caused by the discontinuous step change of the multifocal contact lens. Causal blur An image phenomenon is generated, and the first optical zone 111 is available for the wearer to view the scene from a distance, and the second optical zone 112 is for viewing the scene at a close distance and can be used as a presbyopic lens.

Through the above description, the advantages of the present invention can be further summarized as follows:

1. The continuous zoom contact lens 1 of the present invention continuously changes the refractive power of the first optical zone 111 and the second optical zone 112 in the radial direction so as to not only correct the refractive error of the eyeball, but also correct the retina 91 at the same time. The imaging focus position of the peripheral range 912 maintains optical quality with no aberrations and skipping or spectroscopic phenomena.

2. Adjusting the change in the refractive power of the continuous zoom contact lens 1 such that the difference between the refractive power at the central optical axis L and the radius of 3 mm and the refractive power at the central optical axis L is less than 1.5D. It can effectively reduce the adjustment force of the ciliary muscle 92 to the water crystal 93, and reduce the fatigue caused by the long-term close-eye use, which can relieve the burden of the eye 9.

3. The diopter of the second optical zone 112 is increased by a positive value in the radial direction, and the average rate of change of the diopter is greater than 0.75 D/mm, which can effectively reduce the increase of the myopia degree of the child.

4. Adjusting the initial refractive power of the first optical zone 111, and then adjusting the diopter change of the second optical zone 112 to gradually increase the degree of hyperopia corresponding to the wearer, making it suitable for presbyopic patients. Look around and wear it.

In summary, the continuous zoom contact lens 1 of the present invention continuously changes its refractive power in the radial direction, so that it can correct the abnormality of the eyeball and solve the conventional multifocal lens. There is an image jumping phenomenon or a spectroscopic phenomenon, which causes the wearer to have an adverse reaction such as dizziness, and at the same time corrects the focus position of the peripheral region 912 of the retina 91 to achieve effective relief pressure to the eye, so the invention can be achieved. The purpose.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

1‧‧‧Continuous zoom contact lenses

11‧‧‧Center Optical Zone

111‧‧‧First optical zone

112‧‧‧Second optical zone

12‧‧‧The surrounding area

L‧‧‧ central optical axis

9‧‧‧ eyes

91‧‧‧Retina

911‧‧‧ Macular fovea

912‧‧‧around range

92‧‧‧Ciliary muscle

93‧‧‧Cell crystal

94‧‧‧ cornea

Claims (10)

A continuous zoom contact lens comprising: a central optical zone and a peripheral zone surrounding the central optical zone, the central optical zone comprising a first optical zone and a second optical zone, the first optical zone being the continuous zoom a circular optical region surrounded by a central optical axis of the contact lens and having a radius of 1.5 ± 1.0 mm, the second optical zone extending radially outward from the periphery of the first optical zone to the peripheral region; The diopter of the continuously zoom contact lens continuously changes in the radial direction, and the average rate of change of the diopter is 0.25 D/mm or less in the first optical zone and 0.25 D/mm or more in the second optical zone. The continuous zoom contact lens of claim 1, wherein the refracting power of the continuous zoom contact lens continuously changes radially outward from the central optical axis. The continuous zoom contact lens of claim 1, wherein the refractive power of the second optical zone is increased radially outward with a positive value, and the refractive power at the periphery of the second optical zone and the central optical axis The difference in diopter is not more than 1.5D. The continuous zoom contact lens of claim 1, wherein the refractive power of the second optical zone is increased radially outward, and the average change rate of the refractive power of the second optical zone is greater than 0.75 D/ Mm. The continuous zoom contact lens of claim 1, wherein the first optical zone has a negative refractive index, and the refractive power of the first optical zone and the second optical zone is radially outward. Increase with a positive value. The continuous zoom contact lens of claim 1, wherein the first optical zone has a base arc curvature radius of 8.0 to 9.0 mm and an aspherical conic constant (K) greater than zero. The continuous zoom contact lens of claim 1, wherein an outer edge of the second optical zone and the central optical axis of the continuous zoom contact lens are between 0.5 and 4.0 mm in radius. The continuous zoom contact lens of claim 1, wherein the peripheral region extends outward from an outer edge of the second optical zone, and the peripheral zone adjusts a curvature change according to actual needs to achieve an appropriate lens thickness variation and a reduction image. Poor production. The continuous zoom contact lens of claim 1, wherein the refractive power of the first optical zone is gradually increasing from the central optical axis, and the refractive power of the second optical zone continues the refractive power of the first optical zone. Increasing trend. The continuous zoom contact lens of claim 9, wherein the refracting degree of the first optical zone is lower than the refracting degree of the second optical zone.