CN1162747A - Multifocal ophthalmic lens - Google Patents

Abstract

An ophthalmic lens provides a cumulative ratio of distance to near focal length that is predominantly distance correction under high illumination, nearly evenly divided between distance and near correction under moderate illumination, and favoring again distance vision correction under low level illumination. The lens is specifically adjusted to match the patient's pupil size as a function of illumination level, in the preferred embodiment by applying pupil size parameters as a function of age. This lens has the properties of matching both the distribution of near and distance focal vision correction to the type of human activity typically undertaken in various illumination conditions, as well as matching particular lens dimensions to suit the size of the pupil as a function of illumination intensity.

Description

Multifocal ophthalmic lens

The present invention relates to ophthalmic lens, relate in particular to eye-use lens with many optical magnifications and focal length.

Wear with eye-use lens normally in order to focus on the nearly thing.For meticulous accurate, each eye all comprises a natural lens and is used for image focu to retina.For twenty-twenty people, the eyeball lens are natural shaped be with remote object image-forming in amphiblestroid shape, and eyeball lens bending, with the low coverage object focus to retina.The image focu of this object with various distances of eyeball lens is called as visual accommodation to the adjusting on the retina.

For a lot of people, the eyesight of eyes is inappropriate, and a kind of situation is considered to long sight.For example the eyesight of human eyes makes a lot of people develop into long sight when old age along with the age descends naturally.In addition, also because of cataract, a lot of people picked-off their natural eyeball and transplant artificial intraocular lens.These do not have ability to change or regulate inside ofeye.Bad eyesight can utilize glasses or other zones of different to have the lens of different magnifications to proofread and correct.Use this glasses, removable she or he the sight line of wearer, object is observed at the position of the optical magnification by having the adequate focusing that is suitable for the object picture on the glasses.

Therefore, the effort that provides the contact lens with many focal lengths to be used to proofread and correct long sight or other reason is also realized fully.

A prior art is tending towards providing how burnt contact lens, to give different contact lens of each eye of user.That is, lens are designed to have nearly magnification-be lens design or focus on the near object, and another lens are designed to have magnification far away-be that lens design becomes to focus on the long distance object.This method is called as single vision, and it is to utilize this fact: under certain environmental baseline, brain can be discerned the picture with the competition of two separation that receive, and can be received in burnt picture and repel the non-at Jiao's picture of a competition.Single vision can proofread and correct or alleviate the long sight symptom and not need complicated lens design or manufacturing.Yet single vision has an important disadvantages, is exactly that it causes the loss of double vision feel image summation and the loss of space or depth perception, and this is called double vision damage property (binocnlarity).

Another example of many burnt contact lenses is to utilize the function of brain to discern the picture of competition, and this is disclosed in United States Patent (USP) 4,923, in 296.This patent has been described a contact lens system that comprises a pair of contact lens, and each lens has area identical near and distance vision acuity.Lens the first half of eyes has near optical power, and the latter half has distance vision acuity, and lens the first half of another eyes has distance vision acuity, and the latter half has near optical power.Described in patent, when two lens use together, lens in two, provide at least part clearly as, suppress fuzzy picture by brain, make clearly as the picture that produces a focusing through calibration.

Another kind of prior art is tending towards providing a kind of how burnt contact lens, and the change of utilization eye pupil size depends on the principle of intraocular incident light intensity; And special, the contraction of pupil is corresponding to brighter illumination.So when a people wore contact lens in brighter illumination, the light that focuses on the eye retina saw through less area on the contact lens

For example, U.S. Pat .4,890,913 disclosed a kind of bifocal contact lenses, it comprises many annulus with different focal powers.The eyepiece of this lens design in institute free in, and no matter how pupil diameter is always maintained at the approximately equalised separation of near and distance vision acuity, 6 to 12 rings are arranged during this need be on lens different focal power.

Also having one, that attempt the bifocal contact lens is provided is U.S. Pat .4,704,016 in this patent disclosed contact lens also be free no matter pupil diameter tries hard to keep the approximate separation that is equal between near and distance optical power in institute.

It is another kind of that to make many burnt methods of proofreading and correct eye lens be that to utilize a shortcoming of this method of effect of diffraction optics be visual debility under decreased light.For meticulous processing, in diffractive designs, 40% the light of only having an appointment incides on the lens, is used near vision, and 40% light is used for distance vision in addition.Remaining 20% incident light both had been not used near vision and also had been not used in distance vision, but lost in the diffraction of high order and scattering effect.The best theoretical effect of this numerical value of 40% representative, the getable light of making difficulty institute of in fact this lens seldom.Usually make another deficiency that difficulty is represented diffraction lens, promptly the Difraction surface of these lens is to make in the identical error range of optical wavelength magnitude.Based on above reason, though simple how burnt refractor system such as haplopia mirror are understandable, the design complexity of these lens combinations, mainly still theoretic.

United States Patent (USP) 5,002,382 and 5,024,517 disclose a pair of complementation contact lens it two or more correction focal powers are arranged on relative structure.Yet each two right lens only comprises the ring of two different focal powers.

A kind of more practical and improved method that multifocal ophthalmic lens is provided has been 07/827,199 in application number formerly, in the files that January 28.1992 submits to description is arranged.This part application discloses a multifocal ophthalmic lens, a part of one of the how burnt sheet that a central rings that has altogether is lens.The intersegmental boundary of this lens is by accurate path limit, and as a semicircle, and the two ends in this path are on the circumference of low coverage and the combination of long distance sheet.This designing and arranging is except the central optical axis of the segment area that comprises central binding site.

The lens of making according to above-mentioned application are useful to some patient under a certain condition.Yet, the overall satisfactory level of multifocal ophthalmic lens is still waiting to improve.With existing multifocal lens design, the patient may have problems to the competition picture under the high illumination, and is centering to the reading existing problems under the low light photograph.In addition, at night, also can be had problems to the patient by the halation that occurs around the light source, this problem may be to driving more trouble night.

One object of the present invention is to provide a kind of eye-use lens of proofreading and correct long sight.

Second purpose of the present invention is to provide a kind of eye-use lens of proofreading and correct long sight, improves visual acuity generally, especially can satisfy the requirement of wearer's focusing under various intensity of illumination conditions.

The 3rd purpose of the present invention is to make the distribution near and burnt vision correction far away that is provided by eye-use lens to be associated with the type of sports of people under any lighting condition.

The 4th purpose of the present invention is to design a kind of many focal lengths eye-use lens according to wearer's pupil with the type of sports that shifts gears and carried out of intensity of illumination under any lighting condition.

The 5th purpose of the present invention is to make many focal lengths eye-use lens be suitable for the wearer by focal power that the wearer requires and the size of wearer's pupil under various lighting conditions are complementary.

The how burnt contact lens of realizing such or such purpose comprises the matrix of a hollow spill, and comprises a central area and at least the first and second donuts.Central area has an optical surface district and first focal power.The first ring territory is round the central area extension and comprise many donut subregions, and these subregions series connection also comprise an inner most subregion and the subregion that at least one is additional.

Inner most subregion has one second focal power, and has one to approximate or greater than the optical surface area in central area optical surface district.Preferably the optical surface area at center approximates the first ring territory optical surface area summation with second focal power with the first ring territory optical surface area sum with first focal power.In addition, lens approximately half or more than half optical surface area first focal power is arranged; Preferably about 60% or first focal power is arranged more than 60% optical surface area.Here among the embodiment of Xiang Shuing, the optical surface area of lens about 70% has first focal power, and about 30% optical surface area has second focal power.

When lens had on and the live part of lens-be transmitted light when the light lens component that sees through pupil changes then, the live part of lens and the size with nearly Jiao and burnt focal power part area far away also change.For a preferred lens design, mainly to be first focal power (being often referred to long distance) (ii) almost divide low coverage and distance optical power equally proofreading and correct under the strong illumination condition to the corrected rate (i) that the ratio of last area and back one area changes-makes lens along with the variation of lens live part and provides on a 50-50 basis under the moderate lighting condition; (iii is partial to the first magnification vision correction again under low illumination.

All the other advantages of the present invention and strong point are passed through the detailed description of the following embodiment of the invention and with reference to the accompanying drawings, are become more obvious.

Fig. 1 is the part diagrammatic sketch of the eye-use lens of the embodiment of the invention.

Fig. 2 is the long-pending comparison bar charts of image planes under focal length far away under the various pupil diameter and nearly focal length of the lens shown in Fig. 1.

Fig. 3 is the eye-use lens synoptic diagram that has three focal power annulus in the prior art.

Fig. 4 is the long-pending comparison bar charts of image planes under focal length far away under the various pupil diameter and nearly focal length of lens shown in Fig. 3.

Fig. 5 is another eye-use lens synoptic diagram with three focal power annulus in the prior art.

Fig. 6 is the bar chart of the image planes integration cloth under focal length far away under the various pupil diameter and nearly focal length of lens shown in Fig. 5.

Fig. 7 is that second of the present invention implements lens drawings.

Fig. 8 is similar to the long-pending comparison bar chart of image planes under focal length far away under the various pupil diameter and nearly focal length of lens shown in Fig. 7 of Fig. 2.

Fig. 9 is the 3rd an embodiment synoptic diagram of the present invention.

Figure 10 is the long-pending comparison bar charts of image planes under focal length far away under the various pupil diameter and nearly focal length of lens shown in Fig. 9.

Figure 11 is the lens for a set type, and the average acuity at a distance of wearer is to the curve map of average in-plant acuity.

Figure 12 is for the average visual acuity of each user of one group of lens or the one pair of lens number of rings curve map to lens combination or lens centering.

Figure 13 is the light amplification rate with the lens of the aspheric surface function that sees through lens, has the bar chart of the long-pending number percent of effective optical surface of lens of a distance optical power with the pupil diameter function.

Fig. 1 represents the optical surface of eye-use lens 10.Lens 10 comprise 14, the second ring territories 16, central area 12, the first ring territories; Preferably encircle territory 14 and comprise a series of endless belt or subregion 14a-14e, lens 10 also comprise a zone circumference or biconvex (not shown), the optical property of lens are not contributed to some extent.

According to the present invention, the interior band 14a in district 12 and district 14 has the focal power of opposite types.For example, have distance optical power, then be with 14a that one tool low coverage focal power is just arranged if distinguish 12; Otherwise, have a near optical power if distinguish 12, then be with 14a that a distance optical power is just arranged.In addition, the interior band 14a in district 14 tightly is positioned at the outside in district 12 and 12 extensions around the district, with the actual area that equals central area 12 of 14 area.In addition, focal power checker between low coverage and distance optical power of the band 14a-14e in district 14.Half that the optical surface of lens is long-pending or first focal power is mostly arranged; Preferably optical surface long-pending 60% or more than 60% surface area first focal power is arranged.

For the special case of the lens shown in Fig. 1 10, central area 12 has that a distance optical power band 14a-14e is respectively closely, far away, near, far away and near optical power, is with 16 a distance optical power is arranged.In addition, for this embodiment of lens 10,70% of the optical surface area of lens has a distance optical power, and 30% of surface area has a low coverage focal power.

For lens of the present invention, the size that means the wearer's pupil when fixing time to effective contributive lens area of correction focal power ratio of lens and subregion thus in office decides.People's pupil size variation pattern can be predicted, and mainly depends on illumination power and people's age.Especially, for people of the same age, the variation of pupil size is the function of illumination value, changes with same or same in fact mode.Therefore, the variation of human eye pupil size is as the function of illumination value, and its mode is can be according to people's estimation of Age.

Find also that in addition the size of human eye pupil-as the magnification type of maximum sized number percent of pupil and correction, what promptly he or she needed far or between near exists certain relation.Especially, when the size of human eye pupil was positioned at the following or upper bound of pupil range of size, human eye needed distance correction; And when the size of human eye pupil was positioned at pupil range of size middle, human eye needed the correction of near or long distance usually.

Therefore, when lens of the present invention are worn the time spent, the contributive lens component size of effective magnification of lens corresponding to proofreading and correct the variation that needs, the wearer is changed; And preferably, each zones of lens is become when wearer's correction need change with zoning design, the needs that effective correction magnification of lens is also pressed with this variation mate variation as one man.

The design parameter of lens 10 is primarily aimed at the eyesight of age the people of 40-60 between year among Fig. 1, lists in following Table I.The various pupil sizes of maximum pupil size number percent have been listed on a leftmost hurdle in the table.Two hurdles on the right in the Table I mark the number percent of effective corrected area of lens-promptly in a certain pupil diameter-when promptly being long distance and low coverage focal power respectively, to the contributive lens area of correction focal power of lens to each pupil diameter of listing.

Table I

Pupil-adjusting lens

Pupil size (as maximum sized number percent)	Effective corrected area percentage of corrected rate lens far away	Effective corrected area percentage of nearly corrected rate lens
			?????0.00	??????0	????????0
?????6.3	??????100	????????0
			?????12.5	??????100	????????0
?????18.8	??????100	????????0
			?????25.0	??????100	????????0
?????31.3	??????70.6	???????29.4
			?????37.5	??????49.0	???????51.0
?????43.8	??????49.8	???????50.2
			?????50.0	??????49.4	???????50.6
?????56.3	??????49.9	???????50.1
			?????62.5	??????49.6	???????50.4
?????68.8	??????48.2	???????51.8
			?????75.0	??????56.4	???????43.6
?????81.3	??????62.9	???????51.8
			?????87.5	??????68.0	???????37.0
?????93.8	??????72.1	???????27.9
			?????100.0	??????75.5	???????24.5

Fig. 2 is with the lens of the structure shown in the form presentation graphs 1 of bar chart, when various pupil diameter, and the Jiao far away that it provides and the contrast of nearly burnt image area.From Fig. 2, can clearly find out, when little and big pupil diameter, lens can realize it mainly being the purpose (corresponding to high and low illumination intensity) that the long sight line is proofreaied and correct, and (corresponding to the illumination of medium tenacity) realizes almost equal area far away and that the low coverage sight line is proofreaied and correct when medium pupil diameter.

When lens 10 and prior art lens being done similar a comparison, it is clearer that the result of lens 10 and advantage just become.

For example, what Fig. 3 represented is a typical prior art, three remote corrections that ring-type eye-use lens 20 has a central area 22 to provide, back to back is first a ring territory 24 that proximity correction is provided, and what the second ring territory, 26 following tables of following again that provide remote correction were listed is some special design parameters of the prior art.

Table II

Far/near/distance lens

Pupil size (as maximum sized number percent)	Effective corrected area percentage of corrected rate lens far away	Effective corrected area percentage of nearly corrected rate lens
			????0.00	????0	????0
????6.3	????100	????0
			????12.5	????100	????0
????18.8	????100	????0
			????25.0	????100	????0
????31.3	????100	????0
			????37.5	????69.4	????30.6
????43.8	????51.0	????49.0
			????50.0	????39.1	????60.9
????56.3	????30.9	????69.1
			????62.5	????25.0	????75.0
????68.8	????20.7	????79.3
			????75.0	????19.0	????51.0
????81.3	????31.0	????69.0
			????87.5	????40.5	????59.5
????93.8	????48.2	????51.8
			????100.0	????54.4	????45.6

Fig. 4 is a width of cloth bar chart, is similar to Fig. 2, has represented lens shown in Figure 3 to different pupil diameter, the percent profile that far away and near focal plane is long-pending.Having clearly illustrated that distribution far away and near optical power that the lens 20 of prior art provide is different in essence distributes accordingly in the present invention.Especially far away in the prior art/near/design far away provides the wearer useless near correction, unless pupil diameter near the maximal value of itself, this situation occur in when the optical illumination level be in the newspaper level and away from an end of intermediate range level between the time.

Fig. 5 has represented the lens 30 of another prior art.Lens 30 are similar to lens shown in Figure 3 20, have three optics zones to compare it with lens 20 a different polarity is arranged, and promptly the central area 32 of lens 30 provides a near correction, and the first ring territory 34 provides a distance correction, and the second ring territory provides a near correction.

The special designs parameter of lens 30 is listed in Table III.

Table III

Closely/far away/low coverage lens

Pupil size (as maximum sized number percent)	Effective corrected area percentage of corrected rate lens far away	Effective corrected area percentage of nearly corrected rate lens
			????0.00	????0	????0
????6.3	????0	????100
			????12.5	????0	????100
????18.8	????0	????100
			????25.0	????0	????100
????31.3	????0	????100
			????37.5	????30.6	????69.4
????43.8	????49.0	????51.0
			????50.0	????60.9	????39.1
????56.3	????69.1	????30.9
			????62.5	????75.0	????25.0
????68.8	????79.3	????20.7
			????75.0	????81.0	????19.0
????81.3	????69.0	????31.0
			????87.5	????59.5	????40.5
????93.8	????51.8	????48.2
			????100	????45.6	????54.4

Fig. 6 represents for different pupil diameter, the percent profile that nearly Jiao that the lens 30 among Fig. 5 provide and burnt image planes far away are long-pending.Fig. 2 and Fig. 6 comparison shows that, what lens 30 and 10 were provided is far away tangible different with the distribution of near optical power.Especially lens 30 can not provide a significant distance correction composition under the strong illumination level, and this is needed the outdoor beholder of bright and clear sunlight.The far vision that lens 30 provide is proofreaied and correct even is also suffered damage under the illumination level of medium range.In addition, under extremely low illumination level, the far vision that lens 30 provide is proofreaied and correct to be no more than and can be utilized 50% of light.

The prior art that another kind is had two optics bands is done similar analysis, and one provides distance correction in the two optics bands, and another provides near correction.The analysis showed that far away with the near optical power profile that these lens provide is incompatible with pupil diameter and Activity Type under different illumination levels.

In order from the present invention, to obtain best income, obtain the authentic data of pupil size in the middle of the people of four groups of all ages and classes: (i) less than 20 years old people's lens with the mode of intensity variation, (ii) between the people of 20-40 between year lens, (iii), (iv) surpass 60 years old people's lens between the lens of the people between 40-60 year.The measurement of these pupils is to carry out under three kinds of different illumination levels in experiment: 250cd/m ², 50cd/m ², 2.5cd/m ²

250cd/m ²Be a very bright illumination, mainly run in sunny open air.50cd/m ²Be the illumination of a medium level, the result that mixes of light source normally, indoors or the open air all can run into.2.5cd/m ²Mainly be to run into, normally under uneven permanent lighting condition, as driving night in the open air at night.

Table IV under the results are shown in of these researchs.What this table provided is the standard error of the mean value and the pupil diameter of pupil diameter under three kinds of different illumination levels.

Table IV

Horizontal pupil diameter

Less than 20 years old age

Illumination intensity (cd/m 2)	Pupil mean diameter (mm)	Standard error (1 ∑)
			????2.5	????6.5962	????0.9450
????50	????4.3499	????0.5504
			????250	????3.4414	????0.3159

20 years old-40 years old age

Illumination intensity (cd/m 2)	Pupil mean diameter (mm)	Standard error (1 ∑)
			????2.5	????6.4486	????0.8259
????50	????4.4843	????0.6342
			????250	????3.5040	????0.4217

The age in 40-60 year

Illumination intensity (cd/m 2)	Pupil mean diameter (mm)	Standard error (1 ∑)
			????2.5	????5.4481	????0.9787
????50	????3.6512	????0.5692
			????250	????3.0368	????0.4304

Greater than 60 years old age

Illumination intensity (cd/m 2)	Pupil mean diameter (mm)	Standard error (1 ∑)
			????2.5	????4.7724	????0.6675
????50	????3.4501	????0.5106
			????250	????2.8260	????0.3435

In addition, under different illumination levels, people usually are being engaged in the dissimilar activity that needs different observation missions.For example under very high illumination level, as 250c./m ²The illumination of representative, people's activities are mainly in sunny open air and with observing action at a distance.At 50cd/m ²Illumination level under, people's activity can be out of doors be mainly concerned with two kinds near and far away and observes action with indoor.Under low illumination level, as 2.5cd/m ²The illumination level of representative, the movable open air that mainly occurs in night relates to and watches action at a distance, as drives a car.

The preferred embodiments of the present invention are inference from above-mentioned discussion, and in conjunction with me in first to file 07/988,088 and 08/246,644. respectively on Dec 9th, 1992 and on May 20th, 1994 submit applications, its title is respectively " Tuned pupil MultifocalContact Lens Design " and " Multifocal Ophthalmic Lens Pair " its disclosure is used for the present invention as the reference data.

As previously mentioned, the variation of individual eye pupil size is the function of illumination level, becomes with the age.In addition, people's visual accommodation ability is promptly regulated natural eye lens and is made and focus on the object of various distances, also become with the age, particularly, before resolution characteristic may be not so good as.

Recording by positive power value can not be the same to the measurement of focal power together to the image focu of nearer (about 18 inches), if desire to make the people correction to be provided must for people's basic long distance correctly to image focu.The positive light coke that provides of reason mainly is as a kind of additional for this reason.An early stage long sight may need to increase by one or focal power still less, and a gerontal patient is in order to need his or her distance correction is increased by two to three diopters of positive light coke to nearly image focu.

Except the lens shown in Fig. 1 10, according to the present invention, also designed many supplementary lenses, these are transparent can to provide various types of distributions with far away and near optical power.

In the embodiment of the invention shown in Figure 7, lens 40 provide a lower positive light coke.Lens 40 comprise a central area 42, the first ring territories 44 and the second ring territory 46; Ring territory 4 comprises a series of endless belt 44a, 44b and 44c.Ring territory 44 is positioned at the outside of central area 42, and stretches out around it, and ring territory 46 is positioned at the outside in ring territory 44 and stretches out around it.Central area 42 has a distance vision acuity, the interior band 44a in ring territory 44 be close to central area 42 around and a near optical power arranged.In addition, the area of the as many as central area 42 of area of band 44a.Other band 44b and the 44c in ring territory 44 alternately have far away and near optical power, in case about 40% o'clock of the feasible wearer's of size design of the central area 42 of lens 40 and zone 44 and band 44a, 44b and 44c platycoria, lens provide the distance optical power and the low coverage focal power of about equal areas.

Table V

Ring territory or subregion	Diameter (mm)
		????42	????2.00
????44a	????3.00
		????44b	????4.25
????44c	????5.20
		????46	????8.00

The peculiar design parameter of lens 40 is listed in following Table VI and is illustrated with curve in Fig. 8.

Table VI

Far/near/distance lens

Pupil size (as maximum sized number percent)	Effective corrected area percentage of corrected rate lens far away	Effective corrected area percentage of nearly corrected rate lens
			????0.00	????0	????0
????6.3	????100	????0
			????12.5	????100	????0
????18.8	????100	????0
			????25.0	????100	????0
????31.3	????64.0	????36.0
			????37.5	????44.4	????55.6
????43.8	????43.8	????56.2
			????50.0	????56.9	????43.1
????56.3	????55.2	????44.8
			????62.5	????44.7	????55.3
????68.8	????47.5	????52.5
			????75.0	????55.9	????44.1
????81.3	????62.4	????37.6
			????87.5	????67.6	????32.4
????93.8	????71.8	????28.2
			????100.9	????75.2	????24.8

Fig. 9 has represented the lens 50 of another embodiment of the present invention.Lens 50 comprise that 52, one of one first central areas are positioned at the outside of central area 52 and are positioned at ring 54 outsides, territory around its outward extending first 54, one in territory of ring and around the ring territory 56 of its expansion.Ring territory 54 comprises a series of endless belt 54a, 54b and 54c.Central area 52 has a distance optical power, the innermost ring band 54a in ring territory 54 be close to district 52 around and have a near optical power.In addition, the area of endless belt 54a equals the area of central area 52 in fact.The endless belt 54b and the 54c in ring territory 54 alternately have far away and near optical power.The ring territory 52,54 of lens 50 and 56 and the size of endless belt 54a, 54b, 54c is designed or, lens provide 100. distance vision acuity in fact when the pupil contraction of user.When platycoria, it is average that the focal power that lens provide is distributed between distance vision acuity and near optical power, and when pupil enlarged fully, 80% was distance vision acuity in the focal power that lens provide, and the 20%th, near optical power.Following Table VII has been listed the ring territory of lens 50 and the diameter of subregion.

Table VII

Ring territory or subregion	Diameter (mm)
		????52	????2.45
????54a	????3.25
		????54b	????3.95
????54c	????4.75
		????56	????8.00

Be listed in the table below VIII and retouch into curve in Figure 10 of the special design reference of lens 50.

Table VIII

Far/near/distance lens

Pupil size (as maximum sized number percent)	Effective corrected area percentage value of proofreading and correct the refractive power lens far away	Nearly effective corrected area percentage value of proofreading and correct the refractive power lens
			????0.00	????0	????0
????6.3	????100	????0
			????12.5	????100	????0
????18.8	????100	????0
			????25.0	????100	????0
????31.3	????96.0	????4.0
			????37.5	????66.7	????33.3
????43.8	????62.8	????37.2
			????50.0	????69.0	????31.0
????56.3	????54.5	????45.5
			????62.5	????53.9	????46.1
????68.8	????61.9	????38.1
			????75.0	????68.0	????32.0
????81.3	????72.7	????27.3
			????87.5	????76.5	????23.5
????93.8	????79.5	????20.5
			????100.9	????82.0	????18.0

Figure 11 is to the average analysis result curve of the lens of above-mentioned discussion and various commercial lens average result curve.Especially, Figure 11 represents for each this lens, the average far of user apart from resolution to average near apart from resolution, long distance and low coverage resolution are calculated with the visual line of sight that user loses.Lens 10 and 40 result of calculation are represented by 10a and 40a respectively.Punctuate 60a, 62a, 64a, 66a represent commercial available bifocal spectacle respectively, haplopia lens and the additional dioptric bifocal contact lens of the needs that are used for long sight.The best lens of function are drawn in Figure 11 middle and upper part the right quadrant, just promptly are being called, positive quadrant.

Figure 12 is the curve of describing about the different value of said lens.Especially, Figure 12 is lens or the lens right number of rings curve of lens user average visual acuity to user. Lens 10 and 40 are respectively by 10b and 40b representative.Punctuate 60b and 62b represent commercial available long distance glasses and haplopia lens respectively.

As being used to assemble substituting of the ring of light in the lens of the present invention, the border circular areas part of lens can provide the ratio of the far away and nearly focal length that needs by the scheme of utilizing design in first to file 07/827,199 (on January 28th, 1992).This method for designing has been quoted the radial segment that comprises different focal powers and has been continued to pass through the ring territory.

For lens 10,40 and 50 discussed above, the optical activities district of each lens is divided into discrete convergence ring by the far away and low coverage focal power that replaces.In another embodiment, power of lens in passing lens be mild smooth rather than discrete change in other special shape, aspheric surface represent that on this meaning the aspheric surface of a taper has the excentricity of variation or the polynomial function of analog discrete function light Jiao slit.But the front or rear surface of aspheric surface lens.

Figure 13 represents that a typical magnification with non-spherical lens distributes.Especially, Figure 13 is that a width of cloth is similar to Fig. 2,8 and 10 curve.Figure 13 represents, along with the variation of the variation of the aspheric surface function that passes lens and pupil diameter and the lens that change, its effective optical area partly has a distance vision acuity for a focal power.

Embodiments of the invention also have gang's lens.Each lens wherein comprise, (i) central area that is used for the long sight line, and (ii) round central area and design or alternately be used for the compound annulus of the wild and long sight open country of myopia, (iii) peripheral annulus that is used for the long sight open country.In this preferred embodiment,, make lens that required near or distance vision acuity is provided by design or the shape that changes the lens rear surface with the contact lens form.

This kind design also can be used as or is used for the IOL structure.In the lens of whole gang, the distance vision acuity of lens is constant; And the near optical power of lens changes, and the lens that can provide near optical power to increase are provided when user's long sight increases.

In this group design, can adopt lens or a pair of lens to go to be fit to the user with the shape of standard, make the near vision acuity that has been improved in the ring territory of the lens thinking myopia and design.

In addition, in another embodiment of the invention, design a pair of lens according to a kind of improved haplopia method.In this design, the lens of one of them be in particular the user required treatment main eyes and design, and another lens design for user's non-main eyes.Utilize this method, can be used for being subjected to the lens of the main eyes of treatment person to have distance vision acuity completely, be that the light that lens design becomes target from afar to send focuses on the pupil, and the light that the focal power that the lens that are used to be subjected to treatment person to make main eyes have is designed to send from the object between near and distant object focuses on pupil, for example, non-main eyes may be fit to the lens of this design, promptly be provided at the distance vision acuity of the 50%-80% between near and the long distance, be that this scope can be designed so that to focus on the pupil from the light that target is sent, and target is away from being subjected to treatment person, and being subjected to treatment person is 50% and 80% in the distance from nearly thing to thing far away.Preferably this power of lens is to the distant location deflection, and promptly lens are partial to the target near the far-end of 50%-80% scope is focused on.In this mode, the lens that non-main eyes are fit to have less than the focal power that is used for long sight, but greater than the target that is distal to 50% place between near and long distance object scope is focused on required focal power.With full haplopia method, will provide 100% right focal power of lens for the lens of main eyes, and the lens that are used to do main eyes will provide 0% focal power.

See significantly, of the present inventionly can realize well that openly the purpose those skilled in the art who proposes previously can provide a lot of modification and embodiment to this, need show that also dependent claims cover all these modifications and embodiment, they all fall in the spirit and scope of the invention.

Claims (15)

1. multifocal ophthalmic lens, it comprises a main body that contains a central area and at least the first and second concentric ring territories, and the first ring territory is expanded round central area, and the second ring territory is characterized in that round the first ring territory expansion,

Central area has an optical surface and has first focal power;

The first ring territory comprises first subregion of one group of concentric, annular, and first subregion is radially arranged and put and comprise inner terminal first subregion radially and first subregion that at least one is additional;

Inner terminal first subregion radially has one second focal power, has an area to approximate or greater than the optical surface of central area optical surface;

The optical surface of central area equals to have the optical surface area that first of second focal power is encircled the territory with the optical surface area sum in the first ring territory with first focal power; And

Half of lens or have first focal power more than half optical surface area.

2. lens according to claim 1 is characterized in that, above-mentioned first subregion comprises radially inner terminal first subregion and one group of first additional subregion; With

One group of first additional subregion alternately has first and second focal powers.

3. lens according to claim 2 is characterized in that, first focal power is a distance optical power, and second focal power is a low coverage focal power.

4. lens according to claim 1 is characterized in that, about 60% or more optical surface of lens have first focal power.

5. lens according to claim 4 is characterized in that, 70% optical surface of lens has first focal power;

30% optical surface of lens has second focal power.

6. lens according to claim 1 is characterized in that, the second ring territory comprises one group of second subregion concentric, annular, and each second subregion has an independent optical surface, and each second subregion has the focal power of one of first and second focal powers

Half of second subregion or more optical surface area have first focal power.

7. lens according to claim 6 is characterized in that, about 60% or above optical surface area of second subregion have first focal power.

8. lens according to claim 7 is characterized in that, about 70% optics of lens surface area has first focal power;

About 30% optics of lens surface area has second focal power.

9. method that how burnt correcting vision is provided, to the patient that needs optical correction dipped beam school just and distance light school change optical correction between just, this method comprises:

Between patient's pupil diameter and exposure intensity, set up first corresponding relation;

Between illumination intensity and patient are near or change that distance light school is just needing, set up second corresponding relation;

The low coverage focal power of decision needs of patients;

The distance optical power of decision needs of patients;

Constitute eye-use lens with a large amount of zone of convergence with far away and near short focal power, it is characterized in that, when lens were worn by the patient, the low coverage focal power that lens provide and the ratio of distance optical power changed as the function of patient's pupil diameter;

On the basis of above-mentioned first and second corresponding relations, and on the basis of the near and distance optical power of above-mentioned needs, determine the size of many concentric regions, feasible when lens are worn by the patient, aforementioned proportion changes to satisfy the change of needs of patients.

10. method according to claim 9 is characterized in that, the step of setting up first corresponding relation comprises the step of first corresponding relation based on patient age.

11. method according to claim 9, it is characterized in that, constitution step comprises to eye-use lens provides the territory of the central rings with distance optical power, encircles the steps such as the second ring territory that distance optical power is expanded and had in the territory around the first ring territory with near and distance optical power of central rings territory expansion with around first; And

The step of determining size comprises: first district with low coverage focal power (i) is provided and has the territory in second district of distance optical power, the total area that makes central area and have first a ring territory of distance optical power approximates central area and has the total area in the first ring territory of low coverage focal power; (ii) determine the size in the second ring territory, the total area that make central area, has the first ring territory of distance optical power and second a ring territory greater than central area, have the total area in the first ring territory and the second ring territory of low coverage focal power.

12. eye-use lens that comprises low coverage focal power and distance optical power, said lens comprises, middle body with above-mentioned distance optical power, first annular section outside the above-mentioned middle body, and comprise than the low coverage focal power district of Duoing, total distance optical power district in the middle body and the first ring part junction, territory, one is positioned at second annular section outside first annular section and comprises sufficient distance optical power district, make middle body, total distance optical power district of first annular and the second annular section junction is greater than the total focal power district in the central first and second annular section junctions.

13. lens according to claim 12 is characterized in that, lens comprise the annular section of a concentric structure.

14. lens according to claim 12 is characterized in that, described annular section comprises more than a kind of focal power.

15. lens according to claim 14 is characterized in that, the focal power of described annular section comprises light belt, and its radial segment is passed the border of described annular section.

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