CN104094164A - Optical lenses used to slow the progression of myopia - 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 CZ1CZ5 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 DZ1DZ5 having second refractive powers for creating a defocused retina image, wherein the plurality of annular vision defocus regions (DZ1DZ5) are arranged to alternate with respective ones of the plurality of annular vision correction regions (CZ1CZ5). With such a configuration, the contact lens 100 is useful for slowing myopia progression.

Description

Optical lenses used to slow the progression of myopia

technical field

The present invention relates to optical lenses for slowing myopia progression, especially but not limited to contact lenses.

Background technique

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

Optical interventions, such as multifocal glasses and contact lenses (CL), have not been proven to slow myopia progression. Only atropine and pirenzipine are effective in delaying deepening, but their possible long-term side effects preclude their recommendation to the general public.

There are approximately 220,000 myopic children between the ages of 5 and 16 in Singapore. Nearsighted children around the world can wear the contact lenses into adulthood and benefit from this intervention. With 83% of young adults in Singapore being nearsighted, the issue is gaining increasing attention.

It is an object of the present invention to provide an optical lens that solves the disadvantages of the prior art and/or provides the public with a useful choice.

Contents of the invention

In a first aspect, there is provided an optical lens for the human eye, the optical lens comprising a plurality of alternating optical zones arranged between the center and the periphery of the optical lens, the alternating optical zones comprising (i) a plurality of annular vision correcting zones having a first optical power for correcting myopic refractive error to produce a focused retinal image, at the periphery of the lens compared to the first optical power at the center of the lens The first optical power is more hypermetropic; and (ii) a plurality of annular vision defocus areas having a second optical power for producing a defocused retinal image, the plurality of annular vision defocus areas being arranged with the plurality of annular vision defocus areas The regions of the correction area alternate.

With this configuration, the applicants have found that this arrangement is effective in slowing myopia progression, especially in children.

Preferably, each of the plurality of ring-shaped vision correction regions and the plurality of ring-shaped vision defocusing regions is grouped into a plurality of pairs for obtaining corresponding first and second refractive powers in the same pair. In this way, the first refractive power can be obtained based on the following formula:

$<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ,</span>$

in:

X is the refractive error of the human eye;

n is the number of pairs; and

i is the serial number of the pair of the said equal annular vision correction area and the annular visual defocus area.

The second refractive power can be obtained based on the following formula:

$<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2.5</span>}\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; ,</span>$

in:

X is the refractive error of the human eye;

n is the number of pairs; and

i is the serial number of the pair of the said equal annular vision correction area and the annular visual defocus area.

Preferably, the optical lens further comprises four or more alternating optical zones. More preferably, the optical lens includes an even number of alternating optical zones, such as 4, 6, 8, 10, 12 zones. Optionally, there are ten alternating optical zones.

The first optical power may include varying optical power values for each of the plurality of vision correction zones. The second optical power may include varying optical power values for each of the myopic defocus regions.

It will be appreciated that the optical lens may be in the form of a contact lens, or may be used as an eyeglass lens.

Description of drawings

Embodiments of the invention are now described with reference to the accompanying drawings, in which:

1 is a contact lens with ten optical zones for correcting a myopic refractive error of -3.00D according to an embodiment of the present invention;

Fig. 2 is a schematic diagram showing the effect of the contact lens of Fig. 1 on myopia;

FIG. 3 shows a contact lens for correcting -2D myopic refractive error and having ten optical zones, as a variation of the contact lens of FIG. 1 ;

Figure 4 shows a contact lens for correcting -4D myopic refractive error and having ten optical zones, as a variation of the contact lens of Figure 1;

FIG. 5 shows a contact lens for correcting -3D myopic refractive error and having eight optical zones, as a variation of the contact lens of FIG. 1 ; and

FIG. 6 shows a contact lens for correcting -3D myopic ametropia and having six optical zones, as a modification of the contact lens of FIG. 1 .

Detailed ways

Figure 1 shows an optical lens 100 in the form of a contact lens (CL) according to an embodiment of the invention. The contact lens 100 is preferably a daily disposable with increased peripheral hyperopia and alternating areas of myopic defocus to reduce or delay myopia progression.

The contact lens 100 includes a plurality of alternating optical zones 102 to correct a myopic refractive error of -3.00 diopters (D), and in this embodiment, there are ten optical zones 102 . The ten optical zones 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 zone 102, the varying refractive power or optical power The intensity is distributed between the center 104 and the periphery 106 in the following manner: 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 -3.00 diopter (D) example, the ten optical zones 102 have powers from center to periphery of -3.0D, -0.5D, -2.5D, 0D, -2D, +0.5D, -1.5D, + 1D, -1D and +1.5D. In this embodiment, optic zone 102 is an annular or concentric ring of equal width that participates in covering the pupil region.

Alternating optical zones 102 include multiple annular vision correcting zones (or simply "clear zones" (CZ)) and multiple annular vision defocus zones (or simply "defocus zones" (DZ)), the clear zones ( CZ) to produce a focused image at the retina. In Figure 1, there are five sharp zones CZ (CZ ₁ , CZ ₂ , CZ ₃ , CZ ₄ and CZ ₅ ) and five defocused zones DZ (DZ ₁ , DZ ₂ , DZ ₃ , DZ ₄ and DZ ₅ ) Alternate arrangement.

It can be seen that the clear zone (CZ) in Figure 1 includes refractive power values to compensate for peripheral hyperopic defocus, which may occur if the clear zone CZ does not accurately correct the relatively hyperopic refractive error existing in the periphery. Specifically, as shown in Figure 1, the power values of the clear zone (CZ) are (X+0.5D), (X+1.0D), (X+1.5D) and (X+2.0D), yielding - Values of 2.5D, -2.0D, -1.5D, and -1.0D. In other words, the optical power at the periphery 106 of the contact lens 100 is more hyperopic to produce a focused image at the retina compared to the optical power near or at the center of the lens.

On the other hand, the defocused zone (DZ) has an optical power arranged to produce a defocused retinal image, and in this embodiment the defocused zone (DZ) has the following optical 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 + 1.5D value.

FIG. 2 shows a schematic diagram of the effect of the contact lens 100 on a myopic eye 200 . Due to this varying refractive power that is more hyperopic or greater at the periphery 106 than at the center 104 of the contact lens 100, the light beam 202 entering the contact lens 100 through the clear zone CZ is in the clear zone CZ The focal point FP(CZ) is focused on the retina 206 to generate a focused image FP(CZ). Meanwhile, due to the refractive power of the defocused zone DZ, the light beam 204 entering the contact lens 100 through the defocused zone DZ is focused in front of the retina 206 at the focal point FP(DZ) of the defocused zone DZ.

It can be seen that the contact lens 100 corrects myopia while also compensating for peripheral hyperopic defocus, and thus the contact lens 100 provides a sharp retinal image both at the center 104 and the periphery 106 of the contact lens.

The contact lens 100 has multiple annular regions configured for different functions to more effectively improve or combat myopia, especially for children. The contact lenses also slow the progression of myopia.

It is contemplated that the configuration of the contact lens 100 can be extended to any number of optic zones 102 and/or used to compensate for different refractive errors. This can be achieved by grouping the sharp zone (CZ) and the defocused zone (DZ) into paired zones. For any "n" pairs of zones (n ≥ 2), the distribution of refractive power at the periphery combining the more hyperopic clear zone CZ and the corresponding defocused zone DZ in the same pair can be summarized as (from center 104 to periphery 106):

Clear area: $(x+\frac{2(i-1)}{\mathrm{no}-1}\mathrm{D.})---\left(1\right);$ and

Defocused area: $(x+\frac{2(i-1)}{\mathrm{no}-1}\mathrm{D.})+2.5\mathrm{D.}---\left(2\right);$

in:

X = refractive error;

i = number of the pair for the region.

In the embodiment shown in FIG. 1 and FIG. 2, it can be understood that the sharp zone CZ and the defocused zone DZ have been grouped into pairs according to their subscripts:

Pair 1: (CZ ₁ , DZ ₁ ); Pair 2: (CZ ₂ , DZ ₂ ); Pair 3: (CZ ₃ , DZ ₃ ); Pair 4: (CZ ₄ , DZ ₄ ); and 5 pairs: (CZ ₅ , DZ ₅ ).

According to formula (1) and formula (2), taking the third pair as an example, the number of the pair is i=3, the number of pairs is n=5, and the x used to correct ametropia is -3D, CZ ₃ , DZ The corresponding refractive power of ₃ is:

CZ ₃ =-2D

DZ ₃ =+0.5D; which is the value shown in FIG. 1 .

According to formulas (1) and (2), the refractive power distributions of contact lenses for 10 regions to compensate for different refractive errors (-2D, -3D, -4D and -5D) are shown in Table 1 below:

Table 1

As with all powers, it is understood that powers at the periphery (ie, clear zone CZ ₅ ) are more hypermetropic than powers at the center (ie, clear zone CZ ₁ ).

FIG. 3 shows a contact lens 300 for compensating -2D ametropia and having the power distribution shown in Table 1 for ten alternating optical zones 302 . FIG. 4 shows a contact lens 400 for compensating for a refractive error of -4D and having the power distribution shown in Table 1 for ten alternating optical zones 402 .

Similarly according to equations (1) and (2), it is also envisioned that the embodiment of FIG. 1 can be extended to different regions. Table 2 shows the refractive powers used to achieve a more hyperopic effect at the periphery of contact lenses with 8, 6 and 4 optical zones for correction of -3D refractive errors:

Table 2

FIG. 5 shows a contact lens 500 with eight alternating optical zones 502 (ie, n=4 pairs) to compensate for a -3D refractive error. The eight optical zones 502 are configured according to Table 2 so that the optical power at the periphery of the contact lens 500 is more hyperopic. FIG. 6 shows a contact lens 600 to compensate -3D refractive error and having six alternating optical zones 602 (ie, n=3 pairs). The six optical zones 602 are configured according to Table 2 so that the optical power at the periphery of the contact lens 600 is more hyperopic.

The described embodiments are not to be understood as limiting. In the described embodiment, the use of soft lenses with myopic defocus and increased peripheral hyperopia is proposed. However, other types of lenses are also conceivable, such as hard lenses. Contact lenses can vary in shape and size, and as such, for varying degrees of myopia, contact lenses can be adapted to reduce myopia. For example, the lens may have a curvature of 8mm, 8.3mm and 8.6mm and a diameter of 13.5mm, 13.8mm or 14mm. The central thickness of -3.00D refractive power is 0.12mm. For each additional power, a pair of inserts can be developed using the mold base.

The widths of the optic zones 102 are shown/described as being equidistant, but may not be so, and thus the widths of the optic zones 102 may vary.

Additionally, while the described embodiments use contact lenses as examples, it should be understood that the embodiments may be adapted to other types of optical lenses, eg, optical lenses for spectacles/glasses. While the described embodiments may be used with eyeglasses, they are not preferred for use with eyeglasses. This is because of the unavoidable eye movements associated with changing the gaze fixation, which changes the alignment between the glasses and the eye position. 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 can overcome the continuously changing fixed gaze of humans, especially children.

In the depicted embodiment, the contact lens has multiple annular zones (≥4) designed for different functions to more effectively treat myopia and it is therefore understood that the contact lens 100 can be configured to have any number of annular zones depending on the application. area.

Having thus fully described the invention, it will be apparent to those skilled in the art that various modifications may be made therein without departing from the scope of the claims.

Claims (10)

1. for an optical mirror slip for human eye, this optical mirror slip comprises a plurality of alternating optical region, and the plurality of alternating optical region is arranged between the center and periphery of described optical mirror slip, and described alternating optical region comprises

(i) a plurality of annular vision correctings region, it has for ametropic the first refractive power of myopia correction, and to produce focusing retinal images, compared to the first refractive power of the center at eyeglass, the first refractive power in the periphery of eyeglass is compared with long sight; And

(ii) a plurality of annular vision out-focus region, it has for generation of the second refractive power that defocuses retinal images, described a plurality of annular vision out-focus region be arranged as with each region in described a plurality of annular vision correctings region alternately.

2. optical mirror slip as claimed in claim 1, it is a plurality of right that each region of wherein said a plurality of annular vision correcting regions and described a plurality of annular vision out-focus region is grouped into, and in order to the centering identical, obtains first and second corresponding refractive power.

3. optical mirror slip as claimed in claim 2, wherein obtains described the first refractive power based on following formula:

$(X+\frac{2(i-1)}{n-1}D),$

Wherein:

X is the ametropia of human eye;

N is described right number; And

I is the right numbering of annular vision correcting region such as described grade and annular vision out-focus region.

4. optical mirror slip as claimed in claim 2 or claim 3, wherein obtains described the second refractive power based on following formula:

$(X+\frac{2(i-1)}{n-1}D)+2.5D,$

Wherein:

X is the ametropia of human eye;

N is described right number; And

I is the right numbering of annular vision correcting region such as described grade and annular vision out-focus region.

5. the optical mirror slip as described in aforementioned any one claim, further comprises four or more than the alternating optical region of four.

6. the optical mirror slip as described in aforementioned any one claim, wherein has ten alternating optical regions.

7. the optical mirror slip as described in aforementioned arbitrary claim, wherein said the first refractive power comprises for each the power values of variation in described a plurality of vision correctings region.

8. the optical mirror slip as described in aforementioned arbitrary claim, wherein said the second refractive power comprises for each the power values of variation in myopic defocus region.

9. the optical mirror slip as described in aforementioned arbitrary claim, the form that wherein said optical mirror slip is contact lenses.

10. glasses, it comprises the optical mirror slip as described in any one in claim 1 to 8.