CN214335389U

CN214335389U - A progressive multifocal ophthalmic lens suitable for people with myopia and presbyopia

Info

Publication number: CN214335389U
Application number: CN202120368866.3U
Authority: CN
Inventors: 吴泉英; 唐运海; 陈晓翌; 余浩墨; 张海平; 张慧星
Original assignee: Suzhou Mingshi Optical Technology Co ltd; Suzhou University of Science and Technology
Current assignee: Suzhou Mingshi Optical Technology Co ltd; Suzhou University of Science and Technology
Priority date: 2021-02-10
Filing date: 2021-02-10
Publication date: 2021-10-01
Anticipated expiration: 2031-02-10

Abstract

The utility model relates to a progressive multi-focus ophthalmic lens suitable for people with myopia and presbyopia. The far vision area of the lens is a rotationally symmetrical aspheric surface, and the peripheral degree is annularly reduced, which is beneficial to relieve the fatigue of myopic eyes. Interference astigmatism at any point within the upper 210° range of the assembly center is less than 0.5 diopter. The interfering astigmatism at any point within the range of the lens cutting edge mount is lower than 85% of the additional power of the lens. There is a longitudinal dioptric stabilization band over 10 mm long in the near zone. The ophthalmic lens provided by the utility model has better rapid adaptability and wearing comfort, and is easy to be accepted by customers who wear progressive multifocal ophthalmic lenses for the first time with myopia and presbyopia.

Description

Progressive multi-focus ophthalmic lens suitable for people with myopia to presbyopia

Technical Field

The present invention relates to a progressive multifocal ophthalmic lens, and more particularly to a progressive multifocal ophthalmic lens for a person who changes from myopia to presbyopia and wears a progressive multifocal ophthalmic lens for the first time.

Background

According to the different functions of each part of the lens, the progressive addition ophthalmic lens is divided into a far vision zone and a near and far zone, the zone connecting the far vision zone and the near and far zone is a gradual change channel (or called intermediate transition zone), one point 2 mm above the geometric center of the lens is the lens assembly center, and the rest part is an interference diffusion zone. Progressive addition ophthalmic lenses can be divided into three categories: (1) the front surface is a progressive multifocal surface, and the back surface is a spherical surface, which is called an outer progressive multifocal ophthalmic lens; (2) the front surface is spherical and the back surface is a progressive addition surface, which is called an inner progressive addition ophthalmic lens; (3) the front and back surfaces are progressive addition surfaces and are called double-free-form surface progressive addition ophthalmic lenses.

In the prior art, the distance vision zone of the progressive addition surface is approximately spherical, the longitudinal stability zone of the near vision zone is short, and an additional power inflection point is formed at about 12 mm below the geometric center of the lens. For people who wear progressive addition ophthalmic lenses for the first time for myopia to presbyopia, the progressive addition ophthalmic lenses of the prior art have three defects: firstly, the far vision zone of the progressive multifocal surface is approximate spherical, and for a myope with a certain degree, the spherical aberration of the far vision zone causes the wide visual field to be limited, and the imaging contrast of the far vision zone is reduced. Especially, most of the current myopia patients with middle and high degrees wear single-focus aspheric spectacle lenses originally, and the discomfort is more easily caused by changing the far vision zone into a spherical design. Secondly, the conventional progressive addition ophthalmic lens considers the balance of the far, middle and near three zones, the maximum value of the interference astigmatism of the conventional progressive addition ophthalmic lens is relatively higher and is relatively close to the gradual change channel, and for the crowd wearing the progressive addition ophthalmic lens for the first time, the low interference astigmatism at the two sides of the gradual change channel is very important, otherwise, the adaptation difficulty is directly caused, and the complaint rate of lens fitting is improved or the satisfaction degree is reduced. Astigmatism within 30 degrees on two sides of the lens center directly determines middle distance interference and interference influence of sight line in far, middle and near conversion, and is of great importance to interference adaptation of an initial wearer. Thirdly, the longitudinal stability zone of the near vision zone of the traditional lens is short, so that the visual effect of a lens dispenser is relatively unstable when the lens dispenser reads and focuses for a long time, the phenomenon is particularly obvious for large-frame glasses, and the discomfort caused by the defect is more difficult to adapt.

In view of the above problems, it is necessary to provide an easily adaptable progressive addition ophthalmic lens for the people who wear a progressive addition ophthalmic lens for the first time, in order to make the progressive addition ophthalmic lens have industrial utility value.

Disclosure of Invention

The utility model aims at providing a crowd who wears progressive multifocal ophthalmic lens for the first time to the myopia changes presbyopia, provides the progressive multifocal ophthalmic lens of an easily adaptation, optimizes and promotes user experience satisfaction.

The technical scheme for realizing the purpose of the utility model is to provide a progressive multifocal ophthalmic lens suitable for the crowd who changes myopia into presbyopia, which comprises a far vision zone at the upper part of the lens, a near vision zone at the lower part of the lens, wherein the far vision zone and the near vision zone are connected through a gradual change channel, and the left side and the right side of the far vision zone and the near vision zone are interference scattered light zones; the assembly center of the lens is positioned 4 mm above the geometric center of the lens; the far vision zone of the lens is a rotationally symmetric aspheric surface, the focal power is increased in an annular manner within a circular range with the radius of 10 millimeters by taking the assembly center as the center in the far vision zone; in the clear visual range angle range of the far vision zone, the interference astigmatism is lower than 0.5 diopter, the clear visual range angle is formed by taking the assembly center as a vertex and taking the contour line of which the interference astigmatism is equal to 0.5 diopter as an edge; the near vision zone of the lens comprises a power change stabilizing zone with the length of more than or equal to 5mm, and in the stabilizing zone, the transverse width of an area with interference astigmatism less than 0.5 diopter is more than or equal to 6 mm; the add power of the lens is less than or equal to 2.00 diopters.

Clear visual range angle more than or equal to 210.

The power change amplitude of the interference light scattering area is less than or equal to 25% of the additional power.

The maximum interference astigmatism value of the interference astigmatism areas at two sides of the lens gradual change channel in the lens cutting edge framing range is less than 85% of the additional focal power of the lens. This range is defined as a rectangular range of 20 mm up and down the geometric center of the lens, 22.5 mm on the horizontal nasal side and 35 mm on the temporal side.

Compared with the prior art, the utility model provides a progressive multifocal ophthalmic lens has following beneficial effect:

1. the relative spherical design of far vision district with cyclic annular aspheric surface design can increase the visual definition and the contrast sensitivity in both sides field of vision that opens to be favorable to alleviating myopia eyes asthenopia.

2. The utility model provides a well distance vision zone of its assembly center both sides of lens has reduced astigmatic interference, has promoted the quick adaptability of lens and has worn the comfort level.

3. The utility model provides a lens can form stable visual sensation in the near zone of looking, reduces by a wide margin and feels owing to the eye fatigue that the focal power is unstable causes when reading for a long time.

4. The utility model provides a lens is in the region beyond near far zone of looking and near zone center, and the focal power range of change is little, forms the focal power stable region, forms on a large scale the intermediate distance vision region, is favorable to improving the adaptability of lens person of wearing to the lens, is favorable to improving myopia changes presbyopia very much, wears the progressive multifocal ophthalmic lens crowd adaptability for the first time.

Drawings

Fig. 1 is a schematic view of a progressive addition ophthalmic lens according to the present invention; in the figure, 1. far vision zone; 2. near vision zone; 3. a gradual change channel; 4. an interference light scattering area; 5. and assembling the center.

Figure 2 is a power and disturbance astigmatism contour plot for a lens provided in embodiment 1 of the present invention;

fig. 3 is a contour plot of power and disturbance astigmatism for a lens provided in embodiment 2 of the present invention.

Detailed Description

Lower surface combinationDrawingsThe technical scheme of the utility model is further explained with the embodiment.

Example 1

In this embodiment, an internal progressive addition ophthalmic lens having a distance vision power of-6.0 diopters and an add power of 1.5 diopters is provided according to the needs of the lens dispenser, the refractive index n =1.56 of the lens material, the lens caliber Φ =80mm, and the progressive channel length 15 mm.

Referring to fig. 1, the progressive multifocal ophthalmic lens suitable for people with myopia and presbyopia provided by the embodiment includes a distance vision zone 1 at the upper part of the lens, a near vision zone 2 at the lower part of the lens, the distance vision zone and the near vision zone are connected through a gradual change channel 3, interference scattered light zones 4 are arranged on the left and right sides of the distance vision zone and the near vision zone, and an assembly center 5 of the lens is positioned 4 mm above a geometric center of the lens; in a far vision zone, an assembly center 5 is taken as a vertex, and an isoline with interference astigmatism equal to 0.5 diopter is taken as an edge to form a range of a clear visual range angle a; referring to fig. 2, a far vision zone 1 of the lens is a rotationally symmetric aspheric surface, and the focal power is increased annularly in a circular range with a radius of 10 mm taking an assembly center 5 as a center in the far vision zone; in the range of clear visual range angle a =240 ° in the far vision zone, the disturbing astigmatism is lower than 0.5 diopter; the lens includes within near zone 2 a power variation stabilizing zone of length equal to or greater than 5mm in which zone the transverse width of the zone of interfering astigmatism less than 0.5 diopter is equal to or greater than 6 mm.

In the lens provided in the present example, after designing the contour line according to the technical scheme provided in document CN107037604B and designing the curvature radius distribution r and the curvature center coordinates (x, η, z) of the surface of the progressive addition ophthalmic lens according to the technical scheme disclosed in document CN101661167B, the rise of each point on the progressive addition ophthalmic lens is determined by the following formula (1):

（1）

wherein,

k0=0.07，m=0.5，σ=280，x₁=-10，x₂=45。

the adjustment factor k in equation (1) is rotationally symmetric about a point in the distance zone 1 and a point in the near zone 2, so that the calculated progressive addition ophthalmic lens exhibits a rotationally symmetric aspheric design in the distance zone 1 and is capable of adjusting the power and disturbing the distribution of astigmatism in the near zone 2. Meanwhile, the adjustment factor k also has an adjusting effect on the focal power of the region outside the far vision region 1 and the near vision region 2, and can slow down the gradient of focal power change in the region, thereby reducing the disturbance astigmatism.

After calculating the progressive addition surface rise according to the formula (1), the power and the distribution of the disturbance astigmatism of the progressive addition ophthalmic lens are calculated according to the differential geometry method as shown in fig. 2. In figure 2, (a) is a power contour plot and (b) is a disturbance astigmatism contour plot, both in diopters. As can be seen from the graph (a), the power increases circularly within 10 mm centered on the fitting center. The optical power of the interference astigmatism region on the lens varies from-5.5 to-5.25 diopters with a variation amplitude of 0.25 diopters, equal to 17% of the additional optical power.

In FIG. 2, as can be seen from (a), the interference astigmatism at any point in the 240 DEG angle range of the upper part of the fitting center in the distance vision zone is less than 0.5 diopter; the rounded rectangular areas formed by the dotted lines in the figure are 20 mm above and below the geometric center of the lens, 22.5 mm on the horizontal nasal side and 35 mm on the temporal side, and have maximum interference astigmatism of not more than 1.23 diopters, which is 82% of the add power and is lower than 85% of the add power of the lens, while the maximum interference astigmatism of the lens in the upper and lower 30 degree angle areas on both sides of the horizontal line of the center by fitting is 0.6 diopters, which is 40% of the add power and is not more than 50% of the add power. The near vision zone includes a 20 mm long photometric variation stabilizing band where the zone of disturbing astigmatism less than 0.5 diopters has a transverse width of 10 mm.

Example 2

In this example, the add power was 2.0 diopters, and the other parameters were the same as in example 1.

The parameters of formula (1) in example 1 were set as:

k0=0.08，m=0.5，σ=200，x₁=-10，x₂=45。

the power and disturbance astigmatism contours of the progressive addition ophthalmic lens obtained by calculating the progressive addition ophthalmic lens surface sagitta as in example 1 are shown in fig. 3. In figure 3, (c) is a power contour plot and (d) is a disturbance astigmatism contour plot, both in diopters. The "cross" (FT) position in the figure is the assembly center. Since a rotationally symmetric aspherical design is present in the far vision zone, the power increases circularly in the 10 mm range centered on the fitting center in the (c) figure. The optical power of the interference astigmatism region on the lens varies from-5.5 to-5.25 diopters with a variation amplitude of 0.25 diopters, equal to 17% of the additional optical power.

In fig. 3, as can be seen from (c), the interference astigmatism at any point in the upper 210 ° angle range of the fitting center in the distance vision zone is less than 0.5 diopter, the rounded rectangular ranges formed by the dotted lines in the figure are 20 mm above and below the geometric center of the lens, 22.5 mm on the horizontal nasal side and 35 mm on the temporal side, the maximum interference astigmatism in the lens is not more than 1.46 diopter, and is 73% of the add power and less than 85% of the add power of the lens, and the maximum interference astigmatism in the upper and lower 30 ° angle ranges of the lens passing through the horizontal line on both sides of the fitting center is 0.75 diopter, is 38% of the add power and is not more than 50% of the add power. The near vision zone includes a 20 mm long power variation stabilization zone where the interfering astigmatism is less than about 10 mm across the width of the 0.5 diopter zone.

The utility model discloses technical scheme's lens that provides only is applicable to the first customer of wearing progressive multifocal ophthalmic lens of additional focal power within 2.00 diopters, and is unlikely to be suitable for to the high additional focal power crowd.

The embodiment of the utility model provides a lens, additional focal power use the assembly center to be the centre of a circle in looking the distant zone within 2 diopters, and the focal power is the girdle shape and increases, is favorable to alleviating near-sighted eyes asthenopia. The interference astigmatism on both sides of the assembly center is below 0.5 diopter, and the interference astigmatism at any point in the 210-degree angle range on the upper part of the assembly center is lower than 0.5 diopter.

The utility model provides a lens is little in disturbing the focal power range of change in scattered light zone, forms the focal power stable region, forms on a large scale the intermediate distance vision region, is favorable to improving lens person of wearing to the adaptability of lens, is favorable to improving myopia changes presbyopia very much, wears the multifocal ophthalmic lenses crowd adaptability of gradually for the first time.

The near vision zone includes a power variation stabilizing zone having a length of 10 mm or more, where the zone of disturbing astigmatism less than 0.5 diopter has a transverse width of not less than 6 mm. The visual sense can be stabilized in the near vision region, and the eye fatigue caused by the instability of focal power can be greatly reduced.

Claims

1. The utility model provides a multifocal ophthalmic lens that advances suitable for myopia changes presbyope crowd, includes the far vision district on lens upper portion, near vision district of lens lower part, and the far vision district passes through gradual change channel with near vision district to be connected, and the far vision district is for disturbing the scattered light zone with near vision district left and right sides, its characterized in that: the assembly center (5) of the lens is positioned 4 mm above the geometric center of the lens; the far vision zone (1) of the lens is a rotationally symmetric aspheric surface, the focal power is increased in a ring shape in a circular range with the assembly center (5) as the center radius of 10 mm in the far vision zone (1); in the range of a clear visual range angle ([ alpha ]) of a far vision zone, interference astigmatism is lower than 0.5 diopter, the clear visual range angle is formed by taking an assembly center (5) as a vertex and taking a contour line with the interference astigmatism equal to 0.5 diopter as an edge; the near vision zone (2) of the lens comprises a power change stabilizing zone with the length of more than or equal to 5mm, and in the stabilizing zone, the transverse width of an area with interference astigmatism less than 0.5 diopter is more than or equal to 6 mm; the add power of the lens is less than or equal to 2.00 diopters.

2. A progressive addition ophthalmic lens suitable for use in a person having myopia to presbyopia according to claim 1, wherein: the clear vision range angle is equal to or greater than 210 °.

3. A progressive addition ophthalmic lens suitable for use in a person having myopia to presbyopia according to claim 1, wherein: the focal power change amplitude of the interference light scattering area (4) is less than or equal to 25% of the additional focal power.

4. A progressive addition ophthalmic lens suitable for use in a person having myopia to presbyopia according to claim 1, wherein: the maximum interference astigmatism value of the interference astigmatism areas (4) at two sides of the gradual change channel in the range of the cutting edge framing of the lens is less than 85 percent of the additional focal power of the lens.