TW201307942A - Optical lens for slowing myopia progression - Google Patents

Abstract

An optical lens for a human eye is disclosed herein. In a described embodiment, the optical lens is in the form of a contact lens 100 which comprises a plurality of alternating optic zones 102 arranged between a centre 104 and a periphery 106 of the contact lens 100. The alternating optic zones 102 include a plurality of annular vision correction regions CZ1-CZ5 having first refractive powers for correcting myopic refractive errors to create a focused retina image. The first refractive powers are more hyperopic at the lens' periphery 106 than at the lens' centre 104. The optic zones 102 further includes a plurality of annular vision defocus regions DZ1-DZ5 having second refractive powers for creating a defocused retina image, wherein the plurality of annular vision defocus regions (DZ1-DZ5) are arranged to alternate with respective ones of the plurality of annular vision correction regions (CZ1-CZ5). With such a configuration, the contact lens 100 is useful for slowing myopia progression.

Description

Optical lens for slowing myopia deepening

The present invention relates to optical lenses for slowing the progression of myopia, particularly with respect to contact lenses but not exclusively for contact lenses.

In the United States, the economic cost of myopia is estimated to be $250 million per year. Adults with high myopia may have blind eye complications, eye complications such as retinal tears and macular degeneration. The prevalence of myopia is highest among adults in urban Asian cities, including Singapore (38.7%) and lower in the US (22.7%). The myopia rate was 27.8% among 7-year-old Singaporean children. It is extremely important to clarify effective interventions that reduce myopia.

Optical interventions, such as multifocal glasses and contact lenses (CL), have not been proven to slow myopia progression. Only atropine and pirenzipine can effectively delay deepening, but possible long-term side effects rule out recommendations to the general public.

There are approximately 220,000 myopic children between the ages of 5 and 16 in Singapore. Myopia children around the world can wear the contact lens until adult and benefit from this intervention. As 83% of young adults in Singapore are nearsighted, this issue is getting more and more attention.

It is an object of the present invention to provide an optical lens that addresses the shortcomings of the prior art and/or provides a useful alternative to the public.

In a first aspect, an optical lens for a human eye is provided, the optical lens comprising a plurality of alternating optical regions disposed between a center and a periphery of the optical lens, the alternating optics The region includes (i) a plurality of annular vision correction regions having a first refractive power for correcting myopic refractive abnormalities to produce a focused retinal image as compared to the center of the lens And the first refractive power, the first refractive power at the periphery of the lens is more hyperopic; and (ii) a plurality of annular visual defocus regions, the plurality of circular visual defocus regions having a defocusing A second refractive power of the retinal image, the plurality of annular visual defocus regions being configured to alternate with respective regions of the plurality of annular vision correction regions.

With this configuration, the Applicant has found that this configuration is effective in slowing the progression of myopia, especially for children.

Preferably, the respective regions of the plurality of annular vision correction regions and the plurality of annular visual defocus regions are grouped into a plurality of pairs for obtaining the corresponding first and second refractive powers in the same pair. In this way, the first refractive power can be obtained according to the following: Where: x is the refractive error of the human eye; n is the number of pairs; and i is the number of pairs of circular vision correction areas and circular visual defocus areas.

The second refractive powers are obtained according to the following: Where: x is the refractive error of the human eye; n is the number of pairs; and i is the number of pairs of circular vision correction areas and circular visual defocus areas.

Preferably, the optical lens further comprises four or more than four alternating optical regions. More specifically, the optical lens comprises an even number of alternating optical regions, such as four, six, eight, ten, twelve regions. Advantageously, there are ten alternating optical regions.

The first refractive powers can include a refractive power value for a change in each of the plurality of visual correction regions. The second refractive powers may also include refractive power values for changes in each of the myopic defocus regions.

It should be understood that the optical lens can be in the form of a contact lens or as a lens for eyeglasses.

1 depicts an optical lens 100 in the form of a contact lens (CL) in accordance with an embodiment of the present invention. The contact lens 100 is preferably a day-throw soft type with increased peripheral hyperopia and alternating myopic defocus areas to reduce or delay myopia deepening.

The contact lens 100 includes a plurality of alternating optical regions 102 for Myopia refractive error of -3.00 diopters (D) is corrected, and in this embodiment, there are ten optical regions 102. Ten optical regions 102 start from the center 104 of the contact lens 100 to the periphery 106 of the contact lens 100 and have varying refractive power or optical power at each optical region 102, the varying refractive power or optical power being at the center 104 to the periphery 106. They are distributed in the following ways: x, x + 2.5D, (x + 0.5D), (x + 0.5D) + 2.5D, (x + 1.0D), (x + 1.0D) + 2.5D, (x +1.5D), (x+1.5D)+2.5D, (x+2.0D) and (x+2.0D)+2.5D. In the example of -3.00 diopters (D), the refractive power of the ten optical regions 102 from the center to the periphery is -3.0D, -0.5D, -2.5D, 0D, -2D, +0.5D, -1.5D, +1D, -1D and +1.5D. In this embodiment, the optical zone 102 is an annular or concentric ring having equal widths that share the pupil area.

The alternating optical region 102 includes a plurality of circular vision correction regions (or simply "clear regions" (CZ)) and a plurality of circular visual defocus regions (or, in short, "defocus regions" (DZ)), such The clear area (CZ) is used to produce a focused image of the retina. In Figure 1, there are five clear areas CZ (CZ ₁ , CZ ₂ , CZ ₃ , CZ ₄ and CZ ₅ ) and five defocus areas DZ (DZ ₁ , DZ ₂ , DZ ₃ , DZ ₄ and DZ ₅ ) Alternate configuration.

As can be appreciated, the clear region (CZ) of Figure 1 contains the refractive power value, and if the clear region CZ does not accurately correct the more far-sighted refractive anomalies present at the periphery, the refractive power values are used to compensate for any possible The surrounding hyperopia occurs and defocuss. Specifically, as shown in Fig. 1, the refractive power values of the clear region (CZ) are (X+0.5D), (X+1.0D), (X+1.5D), and (X+2.0D), Produces values of -2.5D, -2.0D, -1.5D, and -1.0D. In other words, the refractive power at the periphery 106 of the contact lens 100 is more hyperopic than the proximity or at the center of the refractive power of the lens to produce a focused image of the retina.

In another aspect, the defocused region (DZ) has a refractive power configured to produce a defocused retinal image, and in this embodiment, the defocus region (DZ) has the following refractive power: x + 2.5D, (x+ 0.5D)+2.5D, (x+1.0D)+2.5D, (x+1.5D)+2.5D and (x+2.0D)+2.5D to produce -0.5D, 0D, +0.5D, +1D And the value of +1.5D.

FIG. 2 is a schematic diagram showing the effect of the contact lens 100 on the myopic eye 200. Due to the varying refractive power, the refractive power at the periphery 106 is more hyperopic or greater than the refractive power at the center 104 of the contact lens 100, and the beam 202 entering the contact lens 100 through the sharp region CZ is The focus FP (CZ) of the clear area CZ is focused on the retina 206 to produce a focused image FP (CZ). At the same time, due to the refractive power of the defocusing region DZ, the light beam 204 entering the contact lens 100 through the defocusing region DZ is focused on the front of the retina 206 at the focus FP (DZ) of the defocusing region DZ.

As can be appreciated, the contact lens 100 corrects myopia while also compensating for peripheral hyperopic defocus, and thus the contact lens 100 provides a distinct retinal image at both the center 104 and the surrounding 106 of the contact lens.

The contact lens 100 has multiple annular regions that are configured for different functions to more effectively improve or combat myopia, particularly for children. Contact lenses also slow down myopia.

It is contemplated that the configuration of the contact lens 100 can be extended to any number of optical regions 102 and/or to compensate for different refractive anomalies. This can be achieved by grouping the clear area (CZ) and the defocus area (DZ) into pairs of areas. For any "n" pair of regions (n 2), the refractive power distribution of the clear region CZ which is more far-sighted at the periphery and the defocusing region DZ corresponding to the same pair can be summarized as (from the center 104 to the surrounding 106): Where x = refractive error; i = number of pairs of regions.

In the examples of Figs. 1 and 2, it will be understood that the clear region CZ and the defocus region DZ have been grouped according to the subscript: the first pair: (CZ ₁ , DZ ₁ ); the second pair: (CZ ₂ , DZ ₂ ); 3rd pair: (CZ ₃ , DZ ₃ ); 4th pair: (CZ ₄ , DZ ₄ ); and 5th pair: (CZ ₅ , DZ ₅ ).

According to equations (1) and (2), taking the third pair as an example, having the number i=3 and n=5 and correcting the refractive error x, x is -3D, the correspondence between CZ ₃ and DZ ₃ The refractive power is: CZ ₃ = -2D

DZ ₃ = +0.5D; is the value illustrated in Figure 1.

According to equations (1) and (2), the power distribution of the 10 regional contact lenses to compensate for different refractive errors (-2D, -3D, -4D, and -5D) is shown in Table 1 below:

The total refractive power, it should be understood at the center compared to (i.e., clear area CZ ₁₎ refractive power at the periphery (i.e., the clear area CZ ₅₎ refractive power for the distant view.

FIG. 3 illustrates a contact lens 300 for compensating for 2-4 ametropia and the contact lens 300 has a refractive power distribution for Table 1 of ten alternating optical regions 302. Figure 4 illustrates a contact lens 400 for compensating for -4-tropia of refractive error and the contact lens 400 has a refractive power distribution for Table 1 of ten alternating optical regions 402.

It is also contemplated that the embodiments of Figure 1 can be extended to different regions, similarly according to equations (1) and (2). Table 2 shows the refractive power used to achieve a more far-sighted effect around the contact lens. The contact lens has 8, 6, and 4 optical zones to correct the -3D refractive error:

Figure 5 illustrates a contact lens 500 for correcting a refractive abnormality of -3D and having eight alternating optical regions 502 (i.e., n = 4 pairs). Eight optical regions 502 are configured according to Table 2 such that the refractive power is more hyperopic around the contact lens 500. Figure 6 illustrates a contact lens 600 for correcting the ametropia of -3D and having six alternating optical regions 602 (i.e., n = 3 pairs). Six optical regions 602 are configured according to Table 2 such that the refractive power is more hyperopic around the contact lens 600.

The described embodiments are not to be construed as limiting. In the described embodiment, it is proposed to use a soft lens with myopic defocus and increased peripheral hyperopia. However, other types of lenses are envisioned, for example, hard lenses. The shape and size of the contact lens can be varied and, as such, the contact lens can be adapted to slow myopia for varying degrees of myopia. For example, the lenses may have a curvature of 8 mm, 8.3 mm and 8.6 mm and a diameter of 13.5 mm, 13.8 mm or 14 mm. -3D refractive power center thickness is 0.12 Mm. For each additional refractive power, a pair of inserts can be developed using a mold base.

The widths of the illustrated/described optical regions 102 are equidistant but may not be the same, and thus the width of the optical regions 102 may vary.

Moreover, while the embodiments use contact lenses as an example, it should be understood that the embodiments are applicable to other types of optical lenses, for example, optical lenses for spectacles/glasses. While the described embodiments can be used with eyeglasses, they are not preferred for eyeglasses. This is due to the inevitable eye movement associated with changing gaze, which changes the positioning between the spectacles and the position of the eye. On the other hand, the contact lens is fixed and centered around the pupil, and thus the contact lens moves with the movement of the eye, and this overcomes the limitations of continuously changing gaze by humans, especially children.

In the described embodiment, the contact lens has a multi-ring type region ( 4) Designed for different functions to more effectively improve myopia and thus should be understood to have any number of regions depending on the application configurable contact lens 100.

The present invention has been fully described, and it is obvious to those skilled in the art that many modifications may be made to the invention without departing from the scope of the invention.

100‧‧‧Optical lenses/contact lenses

102‧‧‧Optical area

104‧‧‧ Center

106‧‧‧around

200‧‧‧Myopia

202‧‧‧ Beam

204‧‧‧ Beam

206‧‧‧Retina

300‧‧‧Contact lenses

302‧‧‧Optical area

400‧‧‧Contact lenses

402‧‧‧Optical area

500‧‧‧Contact lenses

502‧‧‧Optical area

600‧‧‧Contact lenses

602‧‧‧Optical area

CZ ₁ ‧‧‧clear area

CZ ₂ ‧‧‧clear area

CZ ₃ ‧‧‧clear area

CZ ₄ ‧‧‧clear area

CZ ₅ ‧‧‧clear area

D‧‧‧ Diopters

DZ ₁ ‧‧‧ Defocused area

DZ ₂ ‧‧‧ Defocused area

DZ ₃ ‧‧‧ Defocused area

DZ ₄ ‧‧‧ Defocused area

DZ ₅ ‧‧‧ Defocused area

FP‧‧ Focus

An embodiment of the present invention will now be described with reference to the accompanying drawings in which: FIG. 1 illustrates a contact lens for correcting myopic refractive abnormalities of -3.00D and having ten optical regions in accordance with an embodiment of the present invention; 2 is a schematic view showing the effect of the contact lens of FIG. 1 on myopia; FIG. 3 is a view showing a contact lens for correcting -2D myopic refractive abnormality and having ten optical regions, as the invisible image of FIG. A modification of the glasses; FIG. 4 illustrates a contact lens for correcting -4D myopia ametropia and having ten optical regions as a modification of the contact lens of FIG. 1; and FIG. 5 illustrates a correction for -3D A contact lens having a myopic refractive error and having eight optical regions as a modification of the contact lens of FIG. 1; and a sixth figure illustrating a contact lens for correcting the myopic refractive abnormality of -3D and having six optical regions, A variation of the contact lens of Fig. 1.

100‧‧‧Optical lenses/contact lenses

102‧‧‧Optical area

104‧‧‧ Center

106‧‧‧around

CZ ₁ ‧‧‧clear area

CZ ₂ ‧‧‧clear area

CZ ₃ ‧‧‧clear area

CZ ₄ ‧‧‧clear area

CZ ₅ ‧‧‧clear area

D‧‧‧ Diopters

DZ ₁ ‧‧‧ Defocused area

DZ ₂ ‧‧‧ Defocused area

DZ ₃ ‧‧‧ Defocused area

DZ ₄ ‧‧‧ Defocused area

DZ ₅ ‧‧‧ Defocused area

Claims (10)

An optical lens for a human eye, the optical lens comprising a plurality of alternating optical regions disposed between a center and a periphery of the optical lens, the alternating optical regions comprising (i) plural a circular vision correction region having a first refractive power for correcting myopic refractive error to produce a focused retinal image compared to the first refractive power at a center of the lens The first refractive power at the periphery of the lens is more hyperopic; and (ii) a plurality of annular visual defocus regions having a first image for producing a defocused retinal image The two refractive power regions are configured to alternate with respective regions of the plurality of annular vision correction regions. The optical lens of claim 1, wherein the respective plurality of annular vision correction regions and the respective regions of the plurality of circular visual defocus regions are grouped into a plurality of pairs for obtaining the corresponding firsts in the same pair With the second refractive power. The optical lens of claim 2, wherein the first refractive powers are obtained according to the following: Where: x is the refractive error of the human eye; n is the number of pairs; and i is the number of pairs of the circular vision correction area and the circular vision defocus area. The optical lens of claim 2 or 3, wherein the second refractive power is obtained according to the following: Where: x is the refractive error of the human eye; n is the number of pairs; and i is the number of pairs of the circular vision correction area and the circular vision defocus area. The optical lens of any of the preceding claims, further comprising four or more than four alternating optical regions. An optical lens according to any of the preceding claims, wherein there are ten alternating optical regions. The optical lens of any of the preceding claims, wherein the first refractive power comprises a refractive power value for a change in each of the plurality of visual correction regions. The optical lens of any of the preceding claims, wherein the second refractive power comprises a refractive power value for a change in each of the myopic defocus regions. The optical lens of any of the preceding claims, wherein the optical lens is in the form of a contact lens. A spectacles comprising the optical lens of any one of claims 1 to 8.