WO2015159374A1 - Lentille intraoculaire multifocale diffractante et procédé de fabrication de lentille intraoculaire multifocale diffractante - Google Patents

Lentille intraoculaire multifocale diffractante et procédé de fabrication de lentille intraoculaire multifocale diffractante Download PDF

Info

Publication number
WO2015159374A1
WO2015159374A1 PCT/JP2014/060759 JP2014060759W WO2015159374A1 WO 2015159374 A1 WO2015159374 A1 WO 2015159374A1 JP 2014060759 W JP2014060759 W JP 2014060759W WO 2015159374 A1 WO2015159374 A1 WO 2015159374A1
Authority
WO
WIPO (PCT)
Prior art keywords
zone
region
diffractive
ophthalmic lens
radius
Prior art date
Application number
PCT/JP2014/060759
Other languages
English (en)
Japanese (ja)
Inventor
安藤　一郎
小林　敦
Original Assignee
株式会社メニコン
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社メニコン filed Critical 株式会社メニコン
Priority to JP2016513536A priority Critical patent/JP6246337B2/ja
Priority to PCT/JP2014/060759 priority patent/WO2015159374A1/fr
Publication of WO2015159374A1 publication Critical patent/WO2015159374A1/fr

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/04—Contact lenses for the eyes
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive

Definitions

  • the present invention relates to an ophthalmic lens such as a contact lens or an intraocular lens, and more particularly to a diffractive multifocal ophthalmic lens that generates at least three focal points by diffracted light.
  • an ophthalmic lens has been used as an optical element for correcting refractive error in an optical system of the human eye or an alternative optical element after extracting a lens.
  • contact lenses that are used by being attached to the human eye and intraocular lenses that are used by being inserted into the human eye are used directly by the human eye to provide a large field of view and reduce the sense of discomfort. It can be used widely.
  • Examples of a method for realizing such a multifocal ophthalmic lens include a refractive multifocal ophthalmic lens that forms a plurality of focal points based on the refraction principle and a diffractive multifocal ophthalmic lens that forms a plurality of focal points based on the diffraction principle. It has been known.
  • the latter diffractive type ophthalmic lens has a plurality of concentric diffractive structures formed in the optical part of the lens, and a plurality of focal points are formed by the mutual interference action of light waves that have passed through the diffractive structures (zones). Is to give.
  • a diffractive multifocal lens has a diffractive structure in which the distance between the diffractive zones gradually decreases from the center of the lens toward the periphery in accordance with a certain rule called Fresnel zone.
  • Multi-focality is achieved using origami.
  • the 0th-order diffracted light is used as a focal point for far vision
  • the + 1st-order diffracted light is used as a focal point for near vision.
  • a bifocal lens having a focal point for near and near can be obtained.
  • a specific Fresnel zone configuration is based on a zone interval having a zone outer radius defined by [Equation 1] below. This [Equation 1] is hereinafter referred to as a Fresnel zone setting formula.
  • r n is the outer diameter radius of the n th zone obtained from Equation 1.
  • K is a constant.
  • P is an additional refractive power for setting the focus of the 1st-order diffracted light with reference to the focus of the 0th-order diffracted light. By varying this, the focal position of the 1st-order diffracted light can be changed.
  • the focal point by the 0th order diffracted light is the focal point for the far distance and the first order diffracted light is the focal point for the near distance
  • increasing the P will move the focal position for the near distance closer to the lens. That is, when such a lens is used for a human eye, a closer object can be seen.
  • P is reduced, the near focus position moves away from the lens. In this case, when a lens is used for a human eye, a nearby point that can be viewed is moved away.
  • a bifocal lens In a bifocal lens, there are two focal points, a far focus and a near focus, but there is a blank area where no focus exists between these focal points. As the additional refractive power is increased, the blank area is enlarged.
  • a diffractive multifocal lens with a large additional refractive power is applied to patients with reduced accommodation power, but when using such a lens, the distance and the distance are visible, but exist between the two focal points. If you look at something, it causes the problem of not being clear.
  • the person's eye adjustment required for viewing the object 30 cm in front is about 3.3D.
  • an adjustment of about 1.8-2D is required. It becomes insufficient.
  • the lens requires an additional refractive power of about 1.8-2D.
  • the intraocular lens since the crystalline lens is removed, there is almost no residual adjusting force.
  • Such patients require an additional refractive power of 3 to 3.5D.
  • the additional refractive power is set for such a lens as an intraocular lens as a multifocal ophthalmic lens, it is necessary to further change the additional refractive power given to the lens depending on the setting position of the intraocular lens in the eye.
  • the lens itself needs an additional refractive power of 3.5 to 4D.
  • a diffractive multifocal ophthalmic lens having a further increased number of focal points has been proposed in the conventional diffractive multifocal lens.
  • a diffractive multifocal lens in which a diffractive structure called a relief for modulating the phase of light is a cosine wave (or sine wave) type or a rectangular type.
  • Patent Document 1 discloses a trifocal diffractive ophthalmic lens based on a relief shape such as a cosine wave type, a triangular pyramid type, or a trapezoidal type.
  • a 0th order diffracted light is distributed to an intermediate focus
  • a ⁇ 1st order diffracted light is distributed to a far focus
  • a + 1st order diffracted light is distributed to a near focus by using a cosine wave type relief as a key.
  • specifications of a trifocal diffractive ophthalmic lens that generates a focus at three different points in the vicinity are described.
  • the same additional refractive power is given to the ⁇ 1st order diffracted light and the + 1st order diffracted light with reference to the intermediate focus that becomes 0th order diffracted light.
  • the additional refractive power to the + 1st order diffracted light is P
  • the same additional refractive power of P is given to the ⁇ 1st order diffracted light (although the focal position is reversed).
  • Patent Document 2 also describes a trifocal diffractive eye lens based on a rectangular relief.
  • Patent Document 2 as in Patent Document 1, the specifications of the trifocal diffractive ophthalmic lens in which the far focus, the intermediate focus, and the near focus are formed by ⁇ 1st order diffracted light, 0th order diffracted light, and + 1st order diffracted light, respectively, are described. ing.
  • the additional refractive power between the focal points is basically equal refractive power, and the refractive power of the intermediate focal point is always 1 / refractive power of the near focal point. 2
  • the near focus is set to be 4D
  • the intermediate focus is 2D.
  • the present invention has been made in the background as described above, and the problem to be solved is a diffractive multifocal ophthalmic lens capable of generating at least three focal points, and the degree of freedom in setting the focal position. It is an object of the present invention to provide a diffractive multifocal ophthalmic lens having a large structure and a novel structure and a novel manufacturing method thereof.
  • a diffractive multifocal ophthalmic lens for example, a suitable focus group is appropriately developed according to the situation of a lens user (patient), or each focus is This is to meet the demand for varying the intensity ratio of light at a position.
  • an ophthalmic lens such as a contact lens or an intraocular lens
  • the range of light emitted from or incident on the ophthalmic lens is determined by the size of the eye pupil. Therefore, the effective aperture diameter on the lens side that substantially determines the entrance and exit of light also changes correspondingly if the pupil changes.
  • the diffractive multifocal lens of the prior document has a basic characteristic that the number of focal points and the focal point position do not change even if the aperture diameter changes.
  • Such a characteristic sometimes causes a problem that the efficiency of light energy is reduced due to unnecessary focus generation.
  • the pupil changes in size depending on the brightness of the light. When it is bright, the pupil is small.
  • the pupil has a function of adjusting the amount of light entering the eye, but also has a function of adjusting the depth of focus.
  • the pupil of a person is considerably small in an environment where the illuminance of light is very high, such as a sunny outdoor day.
  • the depth of focus becomes deeper. For example, even in a single focus lens that is focused far away in such an environment, it may be visible to the middle region.
  • a bifocal ophthalmic lens having a focal point in the far and near directions is used, the depth of the respective focal points becomes deeper in a clear outdoor environment.
  • the intermediate region is complemented not only from the far depth of focus but also from the near depth of focus. Even in the case of a bifocal ophthalmic lens that has only two focal points, the object in the intermediate region. It will be possible to see. In other words, there is no need to provide an intermediate focus in such an environment.
  • the diffractive lens of the prior document has a characteristic that the intermediate focus is constantly generated regardless of the size of the aperture diameter, so that the intermediate focus is generated even in the situation where the intermediate focus is unnecessary.
  • the number of focal points increases, the amount of light energy for generating a new focal point is distributed from other focal points, and the brightness and contrast when looking at objects may decrease at the focal point of the distribution source. . Since such a decrease in brightness and contrast may lead to a decrease in the quality of appearance, it is preferable not to set an unnecessary focus in a situation where there is no necessity.
  • the environment in which such work is performed is mainly indoor standard illuminance (brightness under fluorescent lamps).
  • the pupil is somewhat expanded accordingly.
  • the depth of focus becomes shallow, so that it is difficult to cover the intermediate area with the depth of focus. Therefore, for the first time, it is necessary to provide a specification for generating an intermediate focus in a lens aperture region corresponding to the pupil diameter of such an environment.
  • the aperture area where the generation of such an intermediate focus is required is a transition area, in order to keep the quality of visibility at an aperture diameter smaller than the transition area, the far and near two-focus specifications are used. It is preferable that the specification of the diffractive structure is such that an intermediate focal point is generated only in addition to the two focal points in a situation where a transition region is reached.
  • the specification that gives a plurality of different focal points with different areas in the lens is not limited to the combination of the intermediate focal point with respect to the far and near focal points, and the focal point is further closer to the far and near focal points. It may also be necessary in a diffractive ophthalmic lens for application. In a patient with early presbyopia with a residual adjustment force of about 2D, it is visible from a far focus to a point about 50 cm in front. Therefore, the prescription of multifocal ophthalmic lenses for such patients is considered to be based on the two focal points for far and near because the necessity and importance of specifications for generating an intermediate focus are not so high. Become. However, even in such patients, a different focus may be required at different positions other than the far and near positions.
  • the contrast of the object In an environment where the illuminance is reduced, such as in a dimly lit room, the contrast of the object generally tends to decrease. In this case, even if a near focus is provided, near objects may not be sufficiently visible due to the character size and contrast. In such a situation, a person often takes a physiological action to look closer at an object. In this case, in addition to the two far and near focal points, if another focal point is provided at a point located closer to the near side, it is possible to give a clear view even when an object is further brought closer. Become. In such a situation, the lens aperture diameter corresponding to the pupil diameter at the brightness under twilight becomes the transition region.
  • the bifocal of far and near is basically used up to the transition area, and another near focus that can be seen closer to the area is also given. It is preferable to make the specifications as possible.
  • a multifocal ophthalmic lens it is necessary to have a design specification in which a lens region newly appearing as the pupil expands (perhaps the outer periphery of the diffractive structure) is focused on a closer position. .
  • the amplitude function is a function (distribution) mathematically describing the characteristics as a light wave, and is specifically expressed by [Equation 2].
  • the phase corresponds to ⁇ (x) in [Equation 2], and is one of the parameters indicating the state as a wave of light. Specifically, it takes the position of the valley and peak of the wave or every elapsed time. The position is determined. It also accelerates or delays the progression of the wave by changing the phase.
  • the phase is expressed by ⁇ , and its unit is radians. For example, one wavelength of light is expressed as 2 ⁇ radians and a half wavelength is expressed as ⁇ radians.
  • Phase modulation generally refers to a structure or method provided in a lens that changes the phase of light incident on the lens in some way.
  • the phase function is a function that represents a phase change in the exponent part of the [Equation 2] or the cos function.
  • the phase function variable is mainly a position r in the radial direction from the center of the lens, and is used to represent the phase ⁇ of the lens at the point r.
  • an r- ⁇ coordinate system as shown in FIG. It will be represented by 10.
  • a representation of the phase distribution in the entire region provided with the phase modulation structure in the same coordinate system is called a phase profile (Profile) or simply a profile.
  • Profile phase profile
  • ⁇ takes a positive value with respect to the reference line
  • ⁇ takes a negative value
  • the light advances by the phase.
  • a refracting surface not provided with a diffractive structure corresponds to this reference line (surface).
  • the optical axis is a rotationally symmetric axis of the lens, and here refers to an axis extending through the center of the lens to the object space and the image side space.
  • the 0th order focal point refers to the focal position of the 0th order diffracted light.
  • the focus position of the + 1st order diffracted light is referred to as the + 1st order focus.
  • the zone is used here as the smallest unit in the diffractive structure.
  • a region where one blaze is formed is called one zone or zone region.
  • Blaze refers to a form of phase function, for example, a phase that changes in the form of a roof.
  • the basic one of the blaze is that a single flow roof-shaped mountain (ridge line) 12 and valley (valley line) 14 change in a straight line in one zone as shown in FIG.
  • the concept of blaze is also included in the present invention, such as a connection between the mountain 12 and the valley 14 so as to change with a parabolic curve (FIG. 2 (b)) and an uneven shape (square wave shape).
  • the peak 12 and the valley 14 are connected so as to change as a part of the function of the sine wave (FIG.
  • the position of the outer diameter radius r i of the zone and the phase phi i, the position of the inner diameter radius r i-1 Basically, the absolute value of the phase ⁇ i-1 is set to be equal to the reference plane (line), that is,
  • the blaze phase function ⁇ (r) is expressed as [Equation 3]. If necessary, the blaze may be arbitrarily shifted in the ⁇ axis direction with respect to the reference plane (line). The blaze shift amount is set by ⁇ in [Equation 3], and the unit is radians.
  • phase constant refers to the constant h defined by [Equation 4] in the blaze-shaped phase function.
  • Relief is a general term for minute uneven structures formed on the surface of a lens obtained by specifically converting the lens to the actual shape reflecting the optical path length corresponding to the phase defined by the phase profile.
  • a specific method for converting the phase profile into a relief shape is as follows.
  • a positive phase in the phase profile means that the light is delayed, if the light is incident on a region having a high refractive index, it is the same as the case where the positive phase is given.
  • the intensity distribution is a plot of the intensity of light after passing through the lens over a certain region, and is expressed as a conjugate absolute value of the amplitude function.
  • a part or all of the diffractive structure is a zone region set based on [Equation 6] ( 1) and the zone area (2) set based on [Equation 7], and the nth zone radius of the zone area (1) and the mth zone radius of the zone area (2) are the same.
  • the zone up to the nth zone of the zone area (1) is arranged inside the zone area (2), and the (m + 1) th and subsequent zones of the zone area (2) are the nth zone of the zone area (1). It is characterized by being arranged adjacent to the outside.
  • each zone region can be adjusted and set in the lens radial direction, as will be specifically shown in the embodiments described later.
  • the diffractive multifocal ophthalmic lens having a structure according to the present invention has a specific structure in the zone region connection portion defined by the setting formula, and the zone region connection portion is uniform in the lens radial direction. It is not limited to the location, and it is also possible to set zone region connections at a plurality of locations in the lens radial direction.
  • three or more types of zone regions may be formed so as to spread over a predetermined width in the lens radial direction, or two or more types of zone regions may be formed. It is also possible to form the zone region with a predetermined width alternately or repeatedly in the lens radial direction.
  • the present invention relating to a diffractive multifocal ophthalmic lens can also be configured in the following aspects.
  • the zone region (2) has different additional refractive powers P 1 ′, P 2 ′,.
  • the plurality of zone regions (2 1 ), (2 2 ),... Adjacent to each other in the lens radial direction are connected at the same zone radius position. Thus, they are arranged on the inner peripheral side and the outer peripheral side adjacent to each other at the zone radius position.
  • a diffractive multifocal ophthalmic lens having a zone region that can provide substantially three or more different focal points in addition to the focal point by the 0th-order diffracted light.
  • the relationship between the zone region (2 1 ) and the zone region (2 2 ) can be grasped in the same way as the relationship between the zone region (1) and the zone region (2). Therefore, any of the relational expressions between the zone area (2n) and the zone area (2m) described in this specification can be used as a relational expression between the zone area (2 1 ) and the zone area (2 2 ). It is possible to set a zone according to their relational expression.
  • the mathematical expression specifying the present invention is not limited to the above [Equation 8], but represents a technical idea and serves as a design index. For example, an error occurs in a manufacturing process or the like. Therefore, the requirements for a diffractive multifocal ophthalmic lens manufactured and provided with a structure according to the present invention are only required to satisfy the requirements of each formula so as to achieve the intended technical effect. Therefore, it is not necessary to interpret the requirements strictly mathematically, as long as the optical effects of the present invention are exhibited.
  • the first zone radius r 1 of the zone region (1) and the zone region (2) ) In the first zone radius r 1 ′ is set to have a relation of [Equation 9].
  • the first zone radius r 1 of the zone region (1) and the zone region (2) ) Of the first zone radius r 1 ′ is expressed by [Equation 10] and [Equation 11], respectively.
  • a seventh aspect of the present invention is a diffractive multifocal ophthalmic lens according to any one of the first to sixth aspects, wherein at least two radially adjacent zones of the diffractive structure are equally spaced. Including equally spaced zones.
  • the degree of freedom in tuning such as adjustment of the peak position of the light intensity at the focal point is maintained while maintaining the optical characteristics of the basic diffraction structure. Can be bigger.
  • the equally spaced zones are arranged in the zone region (1).
  • the equally-spaced zone is the first (ns) zone radius point of the zone region (1). At least two are included in the range of the (nt) -th zone radius point. However, 0 ⁇ t ⁇ s ⁇ n, and t and s are integers.
  • a tenth aspect of the present invention is the diffractive multifocal ophthalmic lens according to any one of the seventh to ninth aspects, wherein the equally spaced zones are arranged in the zone region (2). .
  • An eleventh aspect of the present invention is the diffractive multifocal ophthalmic lens according to the tenth aspect, wherein the equally-spaced zone is the (ms ′)-th zone radius point of the zone region (2). To the (mt ′)-th zone radius point. However, 0 ⁇ t ′ ⁇ s ′ ⁇ m, and t ′ and s ′ are integers.
  • a diffraction zone is partially formed in either the zone region (1) or the zone region (2). Or may be partially adopted in both of the zone regions.
  • At least three focal points can be generated by diffracted light.
  • one of the three focal points is a far vision focal point and the other focal point is near. This is a visual focus, and yet another focus is an intermediate visual focus.
  • the focal point for far vision is given by zero-order diffracted light of a diffractive structure, and the focal point for near vision and the intermediate point The visual focal point is given by + 1st order diffracted light.
  • a fifteenth aspect of the present invention is the diffractive multifocal ophthalmic lens according to any one of the first to fourteenth aspects, wherein the at least three focal points have a lens aperture diameter of 1.2 mm or more in diameter. It was made to generate. In consideration of the fact that the depth of focus increases when the pupil is reduced according to the degree of brightness of the environment as described above, in general, by setting the optical diameter to 1.2 mm or less, it is possible to perform intermediate vision in a clear outdoor environment. By suppressing the occurrence of this, it is possible to efficiently secure the amount of light energy at the required focal point and improve the contrast.
  • the diffraction zone is characterized by a phase function for modulating the phase of light. It is formed with a diffractive structure.
  • the phase function is a blazed function.
  • the blaze-shaped phase function ⁇ (r) is expressed by [Equation 12].
  • the diffractive structure includes a relief structure reflecting an optical path length corresponding to a phase. It is what.
  • the diffractive structure that gives diffracted light can be configured with a refractive index distribution capable of modulating the phase, for example.
  • a relief reflecting the optical path length in a geometrical uneven shape such as a chevron according to this embodiment, thereby improving the focus design and accuracy.
  • the present invention also provides a method for producing a diffractive multifocal ophthalmic lens including the following steps as a method for advantageously producing the diffractive multifocal ophthalmic lens as described in the first to nineteenth aspects.
  • a step of determining a diffractive structure (1) that gives a desired additional refractive power P Determining the diffractive structure (2) that gives another additional refractive power P ′, and the zone radius in the diffractive structure (1) and the zone radius in the diffractive structure (2) are the same radial position r,
  • a mode in which the radial position r is set within a radius range that is greater than or equal to the minimum diameter of the pupil of the wearer and smaller than the maximum diameter can be suitably employed.
  • the diffractive multifocal ophthalmic lens according to the fourteenth aspect can be advantageously provided.
  • the degree of freedom in setting the focal position is ensured as compared with a diffractive multifocal lens having a conventional structure, and thereby, for example, near, middle, far Therefore, it is possible to independently set the focal point at the intermediate position with a large degree of freedom by avoiding the interlocking of the focal points when setting the three focal points.
  • the intensity ratio or intensity ratio changes substantially depending on the usage environment, etc. It is also possible to set the focus. Such a technical effect can be enjoyed as necessary, and is not necessarily achieved in the present invention.
  • FIG. 6 is a graph of a phase function in an r ⁇ coordinate system, which represents a phase ⁇ of light in a diffractive lens in relation to a lens radial direction position r. It is a graph which illustrates the blaze as one form of the phase function in a diffraction lens. It is a figure regarding the diffractive multifocal ophthalmic lens as Example 1 of this invention, Comprising: (a), (b) shows the phase profile of zone area
  • (D) shows the combined phase profile
  • (e) is a graph showing the intensity distribution in the optical axis direction of the diffractive structures formed by the combination. It is a figure which shows the combination pattern of the diffraction structure based on the zone radius coincidence condition about zone area
  • (D) shows the combined phase profile
  • (e) is a graph showing the intensity distribution in the optical axis direction of the diffractive structures formed by the combination.
  • the diffractive multifocal ophthalmic lens as Example 17 of this invention Comprising: (a), (b), (c) is a phase profile of zone area
  • (D) shows the combined phase profile
  • (e) is a graph showing the intensity distribution in the optical axis direction of the diffractive structures formed by the combination. It is a graph which shows the intensity distribution of the optical axis direction in the diffraction multifocal ophthalmic lens as Example 18 of this invention.
  • Example 19 of this invention Comprising: (a), (b) shows the phase profile of zone area
  • a different Fresnel zone that gives the additional refractive power P ′ based on the above [Equation 1] is defined as a zone region (2), and the m-th zone radius of the region is represented by the following [Equation 14].
  • n and m represent zone numbers, they always take integer values.
  • a and b in [Equation 18] are defined as integers, there are always combinations of n and m in which both sides are equal. That is, n and m are obtained by dividing a ⁇ b ⁇ ⁇ ( ⁇ is an integer of 1 or more), which is a common multiple of a and b, by a or b, respectively. That is, the zone number is expressed by [Equation 19] and [Equation 20].
  • [Table 1] shows specific examples of zone intervals determined by the standard setting formula.
  • the additional refractive power of the zone region (2) is determined by changing the combination of (a, b) of [Equation 15].
  • the calculation software used was that which can calculate the amplitude distribution and intensity distribution from each zone based on a diffraction integral formula derived from a theory known in the field called scalar diffraction theory.
  • the intensity distribution on the optical axis was calculated using such calculation software.
  • the light source was set as a point light source existing in the distance, and the parallel light of the same phase was incident on the lens.
  • the calculation was performed on the assumption that the medium in the object-side space and the image-side space was a vacuum, and the lens was an ideal lens with no aberration (all the light emitted from the lens forms an image at the same focal point regardless of the exit position).
  • the distance on the optical axis from the lens as a base point is converted to diopter, the focal position of the 0th-order diffracted light is normalized as 0D, and the intensity is plotted against the normalized scale.
  • the lens aperture range to be calculated was the area up to the zone number described in each table of the examples unless otherwise specified.
  • Can be set as The specific configuration is that the zone region (1) is arranged at the center of the diffractive structure and the zone region (2) is arranged outside the zone region (1), as if switching the points of the railway track. Thus, the structure is switched from the zone region (2) to the zone region (2).
  • the phase function was set to be a blazed function (function based on the above [Equation 3]) with respect to the zone interval thus configured, and the phase constant h was set to 0.5.
  • Table 2 shows the profile of the diffractive multifocal ophthalmic lens based on the zone spacing combined with such a phase structure.
  • the “zone area (1)” and “zone area (2)” columns indicate the zone interval of each area
  • the “combined profile” column indicates that the zone area is switched at a point where the zone radii match.
  • the combined zone spacing is shown. Note that the zone number in the “combined profile” field is i, and is displayed as a new serial number.
  • Figure 3 shows the profile of a diffractive multifocal ophthalmic lens based on the combined zone spacing.
  • 3A and 3B show the phase profiles 16 and 18 of the zone regions (1) and (2), and the solid lines in the drawing show the zone regions to be combined.
  • FIG. 3C shows a phase profile 20 based on the combined zone spacing. In the following examples, the phase profile of the zone region combined with each zone region is shown as a similar figure.
  • FIG. 3D shows an intensity distribution 22 in the optical axis direction of the diffractive structure configured by switching the zones.
  • the intensity peak located at 0D is derived from the 0th-order diffracted light in the zone regions (1) and (2).
  • the intensity peak generated at a point of about 3.7D is mainly derived from the focus of the + 1st order diffracted light from the zone region (1), and the intensity peak generated at a point of about 3D is mainly from the zone region (2). This is derived from the focus by the + 1st order diffracted light.
  • the focal point of 0D is set as a focal point for far vision
  • the focal point of about 3.7D is mainly a focal point corresponding to a near work such as reading
  • the focal point of about 3D is a focal point for intermediate vision. It can be seen that the resulting diffractive multifocal ophthalmic lens is a multifocal ophthalmic lens that focuses in the far, middle and near regions.
  • the focal point of the intermediate region is 1 ⁇ 2 of the focal point of the near region.
  • the focal point is 2D.
  • the focal positions of the near and intermediate regions can be arbitrarily varied by setting the additional refractive powers of the zone regions (1) and (2).
  • a diffractive multifocal that can appropriately generate the necessary focal point when necessary corresponding to the physiological mechanism of the human pupil.
  • An ophthalmic lens will be obtained.
  • the specification in which the zone region (1) is arranged at the center of the diffractive structure is the object. Therefore, in the situation where the pupil is small, the imaging characteristics of the zone region (1) are first expressed as in this example, and in the situation where the pupil is widened, the imaging characteristics of other different zone areas are additionally expressed. It becomes.
  • An example is shown below.
  • the zone interval of the zone area (2) was determined from the standard setting equation of [Equation 23]. Details of the diffraction structure are shown in [Table 3]. Further, the phase profiles 24, 26, and 28 of the diffraction structure according to FIGS. 4A, 4B, and 4C and the intensity distribution 30 in the optical axis direction are shown in FIG.
  • the lens when the lens aperture diameter extends to a range including the zone region (2), a new focus peak is generated in an arbitrarily set intermediate region.
  • the lens can be a diffractive multifocal ophthalmic lens that can solve another problem that can be solved in an automated manner.
  • this example is an example in which the zone regions are switched by matching the zones with arbitrary common multiples. Switching the zone between the common multiple zones does not affect the set additional refractive power P ', so the + 1st order diffracted light based on the zone region (2) has an intensity peak of about 2.5 to 3D, and the added setting It can be seen that the refractive power can be set within the range of P ′.
  • the zone numbers having the same zone radii are the same as those in the second embodiment.
  • This zone is composed of the sixth to tenth zones in the zone region (2) having an additional refractive power of 4D. Details of the diffraction structure are shown in [Table 6].
  • FIGS. 7A, 7B, and 7C show the phase profiles 48, 50, and 52 of this diffraction structure, and
  • FIG. 7D shows the intensity distribution 54 in the optical axis direction.
  • an intensity peak is generated at a point corresponding to the additional refractive power of each zone region even in a diffractive structure configured by replacing the zone regions.
  • the shape of the peak in the near and middle regions is slightly different. This is considered to be due to the difference in light interference depending on the permutation of the zone regions.
  • the relationship between the aperture diameter and the focus generation is the specification of the multifocal ophthalmic lens in response to a request that the patient in the early stage of the presbyopia described above wants to view closer in an environment where the illuminance is reduced. Is.
  • the additional refractive power of the zone region (1) may be arbitrarily determined according to the purpose, and the additional refractive power of the zone region (2) may be set larger or smaller than this. is there.
  • the new refractive powers are set based on [Equation 15], and the new zone regions are switched and combined at specific zone points. Therefore, it is possible to set a desired diffractive structure and obtain a desired diffractive multifocal ophthalmic lens.
  • zone areas (2) are represented in different zone areas (2) by zone areas (2 1 ), (2 2 ), (2 3 ),...
  • the additional refractive power of each region is P 1 ′, P 2 ′, P 3 ′,...
  • the zone number is m 1 , m 2 , m 3 ,.
  • P 1 ′, P 2 ′, P 3 ′,... are (a 1 / b 1 ), (a 2 / b 2 ), (a) for the additional refractive power P of the reference zone region (1), respectively. a 3 / b 3 ),...
  • the additional refractive powers of both are expressed as [Equation 24] and [Equation 25] using the reference additional refractive power P.
  • Equation 26 is obtained from [Equation 24] and [Equation 25].
  • a 1 , b 1 , a 2 , and b 2 are defined by integers, so the zones shown by [Equation 28] and [Equation 29] as in [Equation 19] and [Equation 20].
  • the zone radius matches with the number.
  • zones can be switched while maintaining the respective Fresnel zone intervals.
  • the zone region (1) that gives the reference additional refractive power and another zone that gives different additional refractive power in the zone region (2) can also be incorporated into the diffractive structure.
  • An example in which a diffractive multifocal ophthalmic lens is specifically designed based on this relationship is shown below.
  • P 1 ' 2.4D zone area zone region (2 1)
  • P 2' and expressed as 3D zone area zone region (2 2).
  • the zone radius of each zone area is shown in [Table 7].
  • the center of the diffractive structure was set as the first to fifth zones of the zone region ( 1 ), and the fourth zone of the zone region (2 1 ) was arranged outside thereof.
  • the sixth zone of the zone region (2 2 ) was provided outside the zone region, and the ninth and tenth zones of the zone region (1) were further arranged outside the zone.
  • the phase profiles 56, 58, 60, 62 in which the zone regions are switched are shown in [Table 7] and FIGS. 8 (a) to 8 (d).
  • the intensity distribution 64 in the optical axis direction of the diffractive structure is shown in FIG.
  • the intensity distribution of this example includes the zone region (2 1 ) and the zone region (2 2 ), so that the additional refractive power is also influenced by the mutual interference between the zone region group and the zone region (1).
  • the intensity distribution is a series of multi-peaks ranging from 2 to 4D.
  • the aperture diameter is small, the bifocal imaging characteristic is formed only by the contribution of the zone region (1), and when the aperture diameter is large, the intensity distribution 64 shown in FIG. 8E is obtained.
  • the intensity distribution 64 shown in FIG. 8E is obtained, which is useful as a multifocal ophthalmic lens that can almost cover the intermediate region from near.
  • Example 7 shows that the zone can be switched.
  • the additional refractive power of each zone region set under such conditions is as follows.
  • the one set in this way can be switched to each zone area with the same zone number as in the sixth embodiment. Details of the diffraction structure are shown in [Table 8]. 9A to 9D show the phase profiles 66, 68, 70, 72 of the diffractive structure, and FIG. 9E shows the intensity distribution 74 in the optical axis direction.
  • the focal point of the zone region (1) by the + 1st order diffracted light appears as an intensity peak at a point of about 2.5D.
  • the other focus peaks have the same distribution as in Example 6, and show a multi-peak intensity distribution from about 1.3D to 2.2D. From this example, it can be seen that if a relational expression having the same zone radius is used, the intensity distribution of the same pattern is exhibited even if the additional refractive power of the reference zone region (1) is arbitrarily changed.
  • an ophthalmic lens for example, a multifocal contact, for a patient who still has a little adjustment power of his / her own eye. It becomes useful as a lens.
  • the additional refractive power different from the standard additional refractive power can be arbitrarily set by changing the values of a and b in [Equation 15].
  • a diffractive multifocal ophthalmic lens having such a diffractive structure can form a plurality of different focal points in different regions, and can provide a necessary focal point according to changes in the pupil diameter due to the environment.
  • a multifocal ophthalmic lens can also be obtained.
  • This characteristic is ideal in consideration of the relationship between the aperture diameter and the depth of focus that define the substantial incidence or emission range of light in the lens.
  • the depth of focus is deep when the pupil diameter is small in the human eye, even if the lens is designed so that the focal point is only in two places in the distance, the depth of focus is substantially applied to the intermediate region.
  • such an environment with a small pupil diameter is a case where the illuminance is high, such as a sunny day, and there is not much work frequency such as viewing the distance corresponding to the intermediate area in such an environment. Focus generation need not be considered.
  • the pupil diameter is slightly enlarged and the depth of focus is shallow in a standard illuminance environment, such as when the work environment is changed to the office, but the lens of the present invention is intermediate in accordance with the transition of such a state.
  • the focus in the region starts to be generated at the right time.
  • Zone switching using the extended setting formula (Setting formula for setting the zone first radius arbitrarily)
  • the setting of the zone is not limited to [Equation 1], and other setting formulas may be used.
  • [Equation 1] was a type in which the zone diameter was set in a form including the first zone diameter.
  • [Formula 32] has a format in which the first zone diameter can be arbitrarily set. Even using such a setting formula, the zones in the present invention can be switched.
  • r 1 of the first zone diameter, the add power P, and the design wavelength lambda, and the n-th zone diameter is defined as the zone region (1) as described above.
  • zone region (2) is expressed by the same formula.
  • Add power zone area (2) P When ', the first zone radius r 1' and, the m-th zone radius r m of the zone region (2) is represented by [Expression 33].
  • Equation 37 is obtained from [Equation 35] and [Equation 36].
  • the zone number (n, m) for an arbitrary (a, b) is set by [Equation 39] and [Equation 40].
  • the variable ⁇ is incorporated in addition to the variables a and b for setting the additional refractive power of the zone region (2).
  • a condition for matching the zone radii a condition for changing ⁇ is newly added, and the first zone radius of the zone area (1) or the zone area (2) can be arbitrarily set. This further increases the degree of freedom in designing the diffractive multifocal ophthalmic lens.
  • a series of formulas [Formula 36], [Formula 32], and [Formula 33] that increase the degree of freedom in setting r 1 and r 1 ′ by introducing ⁇ will be referred to as “extended setting”. It will be called “expression”.
  • ⁇ When ⁇ is set to a value other than zero, it corresponds to setting the first zone radius of the zone region (2) differently while arbitrarily setting the first zone radius of the zone region (1).
  • the zone radii coincide with numbers different from those in the case ([Table 12]).
  • the zone radius matching condition can be finely adjusted by setting ⁇ , and a diffractive multifocal ophthalmic lens with a higher degree of freedom can be designed.
  • [Table 9] to [Table 17] show the genealogy of the switchable zones, and it is possible to select a desired arrangement and combination from such genealogy.
  • this invention is not limited to this description example, It can apply also to another combination.
  • ⁇ 1
  • the first zone radius of the zone region (2) was obtained from [Equation 36]
  • r 1 ′ 0.1396 mm.
  • the zone interval of the zone area (2) was set.
  • the diffractive structure was set by switching the zones so that the sixth to eighth zones of the region (1) were arranged. Details of the phase profiles 78, 80, and 82 of the diffractive structure are shown in [Table 18] and FIGS. 11 (a) to 11 (c), respectively. Further, an intensity distribution 84 in the optical axis direction of the diffractive structure is shown in FIG.
  • the optical axis intensity distributions in this example and Example 4 are substantially the same distribution, and it can be seen that the same effect can be obtained even if the number of zones in the region (1) is reduced by one.
  • the outermost diameter of the diffractive structure is about 1.438 mm in radius, and similar imaging characteristics can be realized with a diameter smaller than the outermost diameter of Example 4 (about 1.567 mm in radius).
  • an ophthalmic lens that functions even when the aperture is small, it is useful as an ophthalmic lens for an elderly person whose pupil diameter has decreased with age, for example, an intraocular lens. From this example, it can be seen that the use of the extended setting formula increases the degree of design freedom.
  • This set value is set to a value slightly larger than that given by the standard setting formula.
  • ⁇ 0
  • the first zone radius of the zone region (2) is the same as that of the region (1).
  • the intensity distribution 92 in the optical axis direction of such a diffractive structure is as shown in FIG. 12D, and peaks that form focal points in the near and intermediate regions are generated based on the zone regions (1) and (2).
  • the zone region (1) is first to sixth and the region (2) is fifth to eighth.
  • the area (1) is the 1st to 7th area and the area (2) is the 6th to 8th area as described above.
  • the difference is that the number of constituent zones in each region is one more in region (1) and one less in region (2).
  • FIG. 12 (d) an intensity distribution 92 substantially similar to that in Example 3 (FIG. 5 (d)) is provided, but an intensity peak is also generated in the vicinity of about 2.1D (FIG. 12 (d). ) Arrow). From this behavior, it can be seen that the range of focus generation in the intermediate region is wider than in the third embodiment.
  • the first zone radius of the zone area (1) can be arbitrarily set, but the one determined from the standard setting formula may be used.
  • the first zone radius of the zone region (2) can be set with a radius different from that according to the standard setting formula by varying ⁇ . Therefore, it is possible to design with a high degree of freedom similar to the above-described embodiment group.
  • the first zone radius of the zone region (2) was calculated based on [Equation 43]
  • r 1 ′ 0.6399 mm.
  • the fourth zone radius of the zone region (1) and the third zone radius of the zone region (2) match from [Table 13].
  • the inner side of the diffractive structure is constituted by the first to fourth zones of the zone region (1), and the outer side thereof is constituted by the fourth to sixth zones of the zone region (2).
  • Details of the phase profiles 94, 96, and 98 of the diffractive structure are shown in Table 20 and FIGS. 13A to 13C, respectively. Further, the intensity distribution 100 in the optical axis direction is shown in FIG.
  • the additional refractive power setting (a, b) is the same combination.
  • the number of zones in the zone region (1) is one less than that in Example 1. It has become.
  • the outermost radius of the diffractive structure is about 1.455 mm, and it can be seen that substantially the same intensity distribution is expressed with the outermost radius smaller than about 1.546 mm in Example 1.
  • This example is also useful as an example of an ophthalmic lens that can be applied to a patient having a small pupil diameter.
  • the additional refractive power, the first zone radius, and ⁇ of the zone region (1) are the same as those in the tenth embodiment, and the zone region (2) and zone regions (2 1 ) and (2 2 ) that give two different types of additional refractive power Consists of.
  • the first zone radius of the regions (2 1 ) and (2 2 ) is 0.6399 mm from [Equation 43], and the zone interval corresponding to each additional refractive power is determined from [Equation 33].
  • the sixth zone radius of the zone region ( 1 ) and the fourth zone radius of the zone region (2 1 ) match.
  • the zone region (2 1 ) matches the sixth zone radius of the region (2 1 ) and the seventh zone radius of the region (2 2 ), respectively, the zone region (2 1 )
  • the sixth zone radius and the seventh zone radius of the region (2 2 ) also coincide with each other. From this relationship, the diffraction structure was set as follows.
  • the inside of the diffractive structure is composed of the first to sixth zones of the zone region ( 1 ), the fifth and sixth zones of the zone region (2 1 ) are arranged on the outer side, and the zone is on the outer side.
  • FIG. 14E shows an intensity distribution 110 in the optical axis direction of the diffractive structure.
  • peaks of approximately equal intensity are generated in the 4D near vision region and the 3D intermediate vision region.
  • a focal region corresponds to a distance that is just right for a patient who has an intraocular lens inserted therein to read and monitor a personal computer monitor, and thus is a multifocal intraocular lens suitable for patients who place importance on such work.
  • zone area (2 1 ) and the area are used.
  • zone switching can be realized within a region sufficiently within the pupil, and such a concern can be avoided. In this way, a more detailed design is possible by using the extended setting formula.
  • the formula group ([Equation 36] to [Equation 43]) into which ⁇ is introduced is an extended formula for matching zone diameters, including standard setting formulas.
  • Equation 44 shows a relational expression for determining the first zone radius of the zone area (2).
  • This expression is the first zone radius of the zone area (1) as the input value, the zone area (2 ) And the zone number that can coincide with each other are optional. That is, the zone radius (2) configured based on the first zone radius matches the zone value (1) with the zone radius (1). Therefore, when this equation is used, the additional refractive power of the zone region (2) need not be determined by an integer ratio, and the zone numbers that can be matched can be arbitrarily set.
  • An example of a diffractive multifocal ophthalmic lens based on switching of zones between zone regions set based on such an expression is shown below.
  • the zone interval of the zone region (2) was obtained from [Equation 33] based on the first zone radius, the zone intervals shown in [Table 23] were obtained.
  • [Table 23] shows that the fifth zone radius of the zone region (1) and the third zone radius of the zone region (2) are the same. Based on this relationship, the first to fifth zones of the zone region (1) are arranged inside the diffractive structure, and the fourth to sixth zones of the zone region (2) are arranged outside thereof. A diffraction structure was adopted. Details of the phase profiles 112, 114, and 116 of the diffractive structure are shown in [Table 23] and FIGS. 15 (a) to 15 (c). Further, an intensity distribution 118 in the optical axis direction of the diffractive structure is shown in FIG. From FIG. 15 (d), peaks derived from the zone regions (1) and (2) are generated in the near region (about 3.9D point) and the intermediate vision region (about 1.6 to 1.9D point), respectively. I understand that.
  • Such an additional refractive power is not determined by an integer ratio of a and b with respect to the additional refractive power P of the zone region (1).
  • the additional refractive power cannot be expressed by an integer ratio.
  • the zone interval can be set so that the zones can be switched.
  • the additional refractive power of the zone region (2) is set to 1.8856D, which is smaller than that of the above-described example group.
  • the zone intervals of both areas set from [Expression 32] and [Expression 33] are as shown in [Table 24]. From this relationship, a combination of zone regions (1) and (2) was used as a diffraction structure in the same manner as in Example 12. Details of the phase profiles 120, 122, and 124 of this example are shown in [Table 24] and FIGS. 16 (a) to 16 (c).
  • the intensity distribution 126 in the optical axis direction is shown in FIG. It can be seen that the same intensity distribution as in Example 12 is exhibited. In this way, it can be seen from this example that the zone can be switched even if the first zone radius of the zone region (1) is arbitrarily varied while the additional refractive power of the zone region (2) is expressed by a non-integer ratio. .
  • [Equation 44] is a more generalized setting expression (hereinafter referred to as “general setting expression”) that can be applied to any additional refractive power.
  • general setting expression is naturally applicable to the additional refractive power that can be expressed by the integer ratio used in the standard or the extended setting formula.
  • the first to sixth zones of the zone region (1) are arranged inside the diffraction structure, and the fifth to seventh zones of the zone region (2) are arranged outside thereof.
  • Details of the phase profiles 128, 130, and 132 of this diffractive structure are shown in [Table 25] and FIGS. 17 (a) to (c).
  • the intensity distribution 134 in the optical axis direction is shown in FIG. It can be seen that peaks are generated that focus on the near and intermediate regions based on the + 1st order diffracted light in the zone regions (1) and (2).
  • the zone radii r m zone region defined by the general formula for setting (2) is a zone radius equivalent in the case of the outermost radius of the zone region (1) to r 1 'in Equation 33].
  • the specific expression is as shown in [Equation 45].
  • [Equation 45] the zone that can be switched from the zone area (1) to the area (2) without going through [Equation 44]. The radius is determined immediately.
  • the fifth to seventh zones correspond to the zone region (2 1 ).
  • the eighth to eleventh zones correspond to the zone region (2 2 ).
  • the zones of the respective areas obtained by such calculation have the same zone radius at the switching point, and form one diffraction structure.
  • the zone radii are matched by conceiving that the additional refractive power is expressed as an integer ratio in the standard setting formula, and that the diffractive structure in which the zone region is switched can be set at the matching point. showed that.
  • the degree of freedom of zone switching can be further increased by extending and generalizing the standard setting formula.
  • the diffractive structure with the switched zone regions can optimize the focus formation for each aperture diameter corresponding to different environments, so that it is useful as a multifocal ophthalmic lens that can solve the aforementioned problems. It becomes.
  • the switching of the zone areas described in the [A] column is basically made up of Fresnel zone intervals determined by [Equation 1]. However, in some cases, the non-Fresnel zone spacing may be part of the configuration.
  • the non-Fresnel interval means a zone interval in which a zone radius is not determined by [Equation 1] within a certain region.
  • various diffractive structures can be adopted in which the zone interval can be set by an arithmetic expression or the like, and the focal point can be controlled and expressed by the diffractive action of the zone region.
  • the zone interval can be set by an arithmetic expression or the like, and the focal point can be controlled and expressed by the diffractive action of the zone region.
  • a zone having an equal interval relationship is an example of a non-Fresnel interval.
  • a zone switching method when an equally spaced zone is made a part of the configuration as a non-Fresnel interval will be described based on the following example.
  • the zone region (1) is formed of such a zone configuration.
  • the zone intervals of each region are shown in [Table 28].
  • the fifth of the zone region (1) and the fifth of the zone region (2 1 ) The third zone radius matches. Further, the fifth zone radius of the fourth and the zone area of zone region (2 1) (2 2) coincide. Further, the sixth zone radius of the zone region (2 2 ) and the eighth zone radius of the zone region (1) also coincide.
  • the diffraction structure was determined as follows. The inner side of the diffractive structure is arranged in the first to fifth zones of the zone region ( 1 ), the fourth zone of the zone region (2 1 ) on the outside, and the fourth zone of the zone region (2 2 ) on the outside.
  • the ninth zone and the ninth and tenth zones of the zone that is to return to the zone region (1) again are arranged outside the sixth zone. Details of the phase profiles 136, 138, 140, 142 of the diffractive structure are shown in [Table 28] and FIGS. 18 (a) to 18 (d). Further, an intensity distribution 144 in the optical axis direction is shown in FIG.
  • the intensity distribution 144 shown in this example is a distribution in which an intermediate focus is generated at a distance suitable for visually recognizing a personal computer monitor in a patient with an intraocular lens inserted. On the other hand, it can be a suitable multifocal intraocular lens.
  • the zone region (1) is formed of such a zone configuration.
  • a zone interval was defined. Such zone intervals are shown in [Table 29].
  • the diffraction structure was determined as follows.
  • the inner side of the diffractive structure is arranged in the first to sixth zones of the zone region ( 1 ), the fifth zone of the zone region (2 1 ) on the outer side, and the fifth zone of the zone region (2 2 ) on the outer side. 7th and 8th zones were arranged respectively.
  • Details of the phase profiles 146, 148, 150, and 152 of the diffractive structure are shown in [Table 29] and FIGS. 19 (a) to 19 (d). Further, an intensity distribution 154 in the optical axis direction is shown in FIG.
  • the interval between the equally spaced zones is narrowed, and the number of equally spaced zones is increased by one.
  • the outermost radius of the diffraction structure of this example is the same as that of the fifteenth embodiment.
  • the ophthalmic lens according to the present example when used as an intraocular lens, the appearance of the intermediate region is enhanced as compared with the fifteenth embodiment, and the personal computer monitor screen and the like can be seen more clearly.
  • the intensity balance can be finely adjusted by slightly changing the configuration of the equally spaced zones.
  • the zone region (1) is formed of such a zone configuration.
  • a zone interval was defined. Such zone intervals are shown in [Table 30].
  • the intensity distribution 164 itself is similar to that of the fifteenth embodiment. Thus, even if the additional refractive power of the zone region (1) is changed, if the setting conditions such as the zone switching number are the same, the form of the intensity distribution is maintained although the focal position varies. That is, it is understood that the setting conditions as shown in this example may be used when only a peak position is changed while maintaining a certain intensity distribution.
  • the ophthalmic lens having a weakened additional refractive power as in this example is a multifocal intraocular that is useful for patients who place importance on visibility in the range of about 40 to 1 m, even among intraocular lens subjects. Become a lens.
  • a contact lens user is a multifocal contact lens that is useful for a patient who wants to compensate for a decrease in accommodation power and view closer.
  • the zone configuration is based on the standard setting formula. However, even when a non-Fresnel interval is included, the zone may be configured using the extended setting formula or the general setting formula. .
  • Example 18 Switching to zone region (2 2) to give another different add power from the zone region (2 1) of Example 16 were conducted on the basis of a general set formula [number 45]. Since the outermost radius of the zone region (2 1) was 1.4309Mm, this value as r n [Expression 45], the add power zone area to change (2 2) and 3.8D, such The additional refractive power was substituted into P ′ in [Equation 45], and the zone interval of the zone region (2 2 ) was determined. Details of the diffraction structure of this example are shown in [Table 31].
  • FIG. 21 shows the intensity distribution 166 in the optical axis direction. In the table, the outermost radius of the zone region (2 1 ) is shown as the first zone radius of the region (2 2 ). By changing the additional refractive power of the zone region (2 2 ) to 3.8D, the intensity distribution of the near vision peak and the intermediate vision peak is approximately equal to that of the embodiment 16, resulting in an intensity distribution.
  • the general setting formula can be used for those including a non-Fresnel interval, and a design with more flexibility can be performed.
  • Example 19 A setting example in which a part of the configuration of the zone region (2) is set as an equal interval zone based on the third embodiment is shown below.
  • the sixth zone of the zone region (2) in the third embodiment is divided into two equal parts by dividing the sixth zone of the zone region (2) into equal zones.
  • the number of constituent zones in the zone region (2) is increased by one.
  • There is no change from the third embodiment except that such equally spaced zones are set. Details of the phase profiles 168, 170, and 172 of the diffraction structure of this example are shown in Table 32 and FIGS. 22A to 22C.
  • the intensity distribution 174 in the optical axis direction is shown in FIG.
  • the sixth zone of the third embodiment is divided into two equal parts, a profile in which two zones having a narrow interval are arranged.
  • the intensity of the peak in the intermediate region is reduced as compared with the third embodiment due to the effect of the equidistant zone, and instead, the intensity distribution in which the peak intensity in the near region increases is shown. That is, in Example 3, the peak intensity of the intermediate region was enhanced, but in this example, while maintaining the peak position of Example 3, the intensity of the peak in the intermediate region is suppressed, and the intensity of the near region is increased. Increased specifications. Therefore, it becomes useful as a multifocal ophthalmic lens with an emphasis on near vision as compared with Example 3.
  • an area other than the zone area (1) may be targeted as such a zone setting location.
  • Examples 15 to 19 the example using the equally spaced zones having the same zone interval as the non-Fresnel interval has been described, but the non-Fresnel interval is not limited to the equally spaced zone.
  • a configuration including zones with different intervals can also be used favorably in the present invention.
  • the distribution ratio of 0th-order diffracted light and other orders of diffracted light can be varied by varying the phase constant h.
  • the peak intensity at each focal point can be controlled by varying the phase constant.
  • Example 20 is an example when the phase constant h is varied.
  • Example 20 An example in which the phase constant h is varied and the profile of the fourth embodiment is targeted is as follows.
  • Example 4 the characteristic that the peak intensity in the intermediate region is slightly larger than that in the near region is shown.
  • the phase constant h was varied for the purpose of varying the peak intensity ratio between the near and intermediate regions while maintaining the peak appearance position of Example 4.
  • the zone radius of the diffraction structure of this example was the same as that of Example 4, and the phase constant was varied as shown in [Table 33]. Details of the phase profile 176 of the diffractive structure associated with the variation of the phase constant are shown in Table 33 and FIG.
  • the intensity distribution 178 of the diffraction structure of this example is shown in FIG. It can be seen that in this example, the peak intensity in the intermediate region decreases and the peak intensity in the near region increases with the variation of the phase constant. It can be seen that the appearance position of each peak is the same as in Example 4, and that the peak intensity can be finely adjusted by varying the phase constant.
  • the method of modulating the phase constant is not limited to such an embodiment, but may be a structure in which the phase constant is modulated according to a certain rule for each zone, for example, a phase modulation structure called apodization. Good.
  • the diffractive structure shown in each of the above embodiments may be set on either the front surface or the rear surface of the target ophthalmic lens. Or you may install in the inside of a lens. Further, as described in, for example, Japanese Patent Application Laid-Open No. 2001-42112, the diffractive structure according to the present invention can be formed on a laminated surface made of two materials having different refractive indexes.
  • the present invention can be applied to a corneal insertion lens that is implanted in the corneal stroma and corrects visual acuity, or an artificial cornea.
  • contact lenses it is preferably used for hard oxygen-permeable hard contact lenses, water-containing or non-water-containing soft contact lenses, and oxygen-permeable water-containing or non-water-containing soft contact lenses containing a silicone component. be able to.
  • an intraocular lens a hard intraocular lens, a soft intraocular lens that can be folded and inserted into the eye, a phakic intraocular lens (phakic IOL), and an intraocular lens for additional insertion (add-on) IOL) and the like can be suitably used for any intraocular lens.
  • phakic IOL phakic intraocular lens
  • add-on IOL intraocular lens for additional insertion
  • phase profile zone region (1)
  • 18, 26, 34, 42, 50, 80, 88, 96, 114, 122, 130, 170 phase profile (zone region (2))

Landscapes

  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Eyeglasses (AREA)
  • Prostheses (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

La présente invention vise à proposer une lentille intraoculaire multifocale diffractante présentant une nouvelle structure pouvant créer au moins trois points focaux et permettant une flexibilité accrue dans le réglage des positions focales, et un nouveau procédé de fabrication de la lentille intraoculaire multifocale diffractante. La lentille intraoculaire multifocale diffractante est constituée par une pluralité de zones concentriques, et une partie ou la totalité de la structure diffractante comprend une première région de zone (16) et une seconde région de zone (18) qui sont réglées sur la base de formules respectives prescrites. Le rayon de la n-ième zone dans la première région de zone (16) et le rayon de la m-ième région de zone dans la seconde région de zone (18) sont identiques ; des zones jusqu'à la n-ième zone dans la première région de zone (16) sont disposées vers l'intérieur de la seconde région de zone (18), et des zones au niveau de et après la (m+1)-ième zone dans la seconde région de zone (18) sont disposées à côté de la n-ième zone dans la première région de zone (16) vers l'extérieur de la première région de zone (16).
PCT/JP2014/060759 2014-04-15 2014-04-15 Lentille intraoculaire multifocale diffractante et procédé de fabrication de lentille intraoculaire multifocale diffractante WO2015159374A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2016513536A JP6246337B2 (ja) 2014-04-15 2014-04-15 回折多焦点眼用レンズおよび回折多焦点眼用レンズの製造方法
PCT/JP2014/060759 WO2015159374A1 (fr) 2014-04-15 2014-04-15 Lentille intraoculaire multifocale diffractante et procédé de fabrication de lentille intraoculaire multifocale diffractante

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/060759 WO2015159374A1 (fr) 2014-04-15 2014-04-15 Lentille intraoculaire multifocale diffractante et procédé de fabrication de lentille intraoculaire multifocale diffractante

Publications (1)

Publication Number Publication Date
WO2015159374A1 true WO2015159374A1 (fr) 2015-10-22

Family

ID=54323620

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2014/060759 WO2015159374A1 (fr) 2014-04-15 2014-04-15 Lentille intraoculaire multifocale diffractante et procédé de fabrication de lentille intraoculaire multifocale diffractante

Country Status (2)

Country Link
JP (1) JP6246337B2 (fr)
WO (1) WO2015159374A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022107288A1 (fr) * 2020-11-19 2022-05-27 日本電信電話株式会社 Dispositif d'estimation, procédé d'estimation et programme d'estimation
US11963868B2 (en) 2020-06-01 2024-04-23 Ast Products, Inc. Double-sided aspheric diffractive multifocal lens, manufacture, and uses thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013118177A1 (fr) * 2012-02-09 2013-08-15 株式会社メニコン Oculaire multifocal à diffraction et procédé de fabrication associé
WO2013118176A1 (fr) * 2012-02-09 2013-08-15 株式会社メニコン Oculaire multifocal à diffraction et procédé de fabrication associé
JP2014032212A (ja) * 2010-11-24 2014-02-20 Hoya Corp 多焦点眼用レンズ

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2752164C (fr) * 2009-02-12 2017-05-30 The Arizona Board Of Regents On Behalf Of The University Of Arizona Verre triple foyer a diffraction
BE1019161A5 (fr) * 2010-01-26 2012-04-03 Physiol Lentille intraoculaire.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014032212A (ja) * 2010-11-24 2014-02-20 Hoya Corp 多焦点眼用レンズ
WO2013118177A1 (fr) * 2012-02-09 2013-08-15 株式会社メニコン Oculaire multifocal à diffraction et procédé de fabrication associé
WO2013118176A1 (fr) * 2012-02-09 2013-08-15 株式会社メニコン Oculaire multifocal à diffraction et procédé de fabrication associé

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11963868B2 (en) 2020-06-01 2024-04-23 Ast Products, Inc. Double-sided aspheric diffractive multifocal lens, manufacture, and uses thereof
WO2022107288A1 (fr) * 2020-11-19 2022-05-27 日本電信電話株式会社 Dispositif d'estimation, procédé d'estimation et programme d'estimation
JP7444286B2 (ja) 2020-11-19 2024-03-06 日本電信電話株式会社 推定装置、推定方法、および、推定プログラム

Also Published As

Publication number Publication date
JP6246337B2 (ja) 2017-12-13
JPWO2015159374A1 (ja) 2017-04-13

Similar Documents

Publication Publication Date Title
WO2016021075A1 (fr) Lentille multifocale de diffraction et procédé de fabrication de lentille multifocale de diffraction
JP6698671B2 (ja) 回折型多焦点眼用レンズおよび回折型多焦点眼用レンズの製造方法
JP5848368B2 (ja) 回折型多焦点眼用レンズとその製造方法
JP5916770B2 (ja) 多焦点眼用レンズとその製造方法
JP6653252B2 (ja) 眼用回折多焦点レンズの製造方法および眼用回折多焦点レンズ
JP2768801B2 (ja) 光学装置
US7156516B2 (en) Diffractive lenses for vision correction
CN104918580B (zh) 用于提供具有改进的景深的眼内镜片的方法和系统
US7025456B2 (en) Diffractive lenses for vision correction
WO2010079528A1 (fr) Procédé de fabrication de lentille diffractive
JP6161404B2 (ja) 回折型多焦点眼用レンズおよびその製造方法
JP5824076B2 (ja) 回折型多焦点眼用レンズとその製造方法
EP3415980B1 (fr) Lentille ophtalmique multifocale diffractive et procédé de fabrication de lentille ophtalmique multifocale diffractive
JP5993950B2 (ja) 回折型多焦点眼用レンズとその製造方法
JP2013165973A (ja) 様々な面積を有する回折ゾーンを備えた擬調節ｉｏｌ
KR20090009303A (ko) 비구면 다초점 회절렌즈
EP1889115A1 (fr) Lentille ophtalmique diffractive asphérique
JP6246337B2 (ja) 回折多焦点眼用レンズおよび回折多焦点眼用レンズの製造方法
TW201103517A (en) An extended depth of focus (EDOF) lens to increase pseudo-accommodation by utilizing pupil dynamics
EP4200665A1 (fr) Lentille oculaire diffractive zonale
CN116400517A (zh) 一种多焦点衍射镜的优化算法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14889277

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2016513536

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 14889277

Country of ref document: EP

Kind code of ref document: A1