JP2007286644A - Contact lens and series of contact lenses - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contact lens in a novel shape which is excellent in shape stability and lens wearing comfort at high level. <P>SOLUTION: The ratio T<SB>BJ</SB>/T<SB>FJ</SB>of the thickness T<SB>FJ</SB>of a junction 32 between an optical zone and a peripheral zone of a lens front and the thickness T<SB>BJ</SB>of a junction 30 between an optical zone and a peripheral zone of a lens back is determined depending upon the dioptric power P of the optical zone so as to satisfy a specified conditional expression. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a series of contact lenses and contact lenses, while having sufficient shape retention characteristics, there is a technique that may caused to realize a contact lens with wearing feel a thin, particularly for soft contact lenses advantageously applied, while maintaining good wear comfort may allowed for superior handling properties and sides determined resistance based on excellent shape retention characteristics, relates to a series of contact lenses and contact lenses of the novel shape It is.

  In general, a contact lens is required to have (a) excellent wearing feeling and (b) excellent handling (handling) by fingers. Therefore, in order to improve the wearing feeling of the former (a), the thickness dimension of the contact lens is set after securing the minimum thickness specified according to the material in consideration of manufacturability and durability. It is desirable to set it sufficiently small, and a thin contact lens is excellent in terms of oxygen permeability. However, when the thickness of the contact lens is reduced, the shape retention characteristics of the contact lens are reduced. Particularly, in the case of a soft contact lens, when the contact lens is put on and taken off, it is clinging to the finger surface and is extremely easy to handle. In addition to being worse, there was a problem that it was difficult to determine the front and back, and the wearability was inferior.

  Therefore, in order to deal with such problems, conventionally, the thickness of the contact lens is made thick enough to ensure handling properties based on good shape retention characteristics, or emphasis is placed on wearing feeling. In order to deal with insufficient shape retention characteristics, the measures to display the front and back judgment marks on the lens surface have been taken, but these are both wearing feeling and shape retention characteristics (handleability). It was just a compromise at the expense of any of the above, and it was never a basic solution. In particular, when a front / back determination mark is attached to the lens, a special process and a processing operation for displaying the mark are required, and there is a problem that manufacturing cost is deteriorated.

  In order to achieve both excellent wear feeling and handleability in a contact lens, (i) Japanese Patent Application Laid-Open No. 8-286155 discloses that the thickness dimension of the peripheral portion is 1 as the thickness dimension of the central portion of the lens. In addition, the connecting part between the optical part and the peripheral part on the front surface (front curve surface) of the lens is positioned more radially outward than the connecting part between the optical part and the peripheral part on the rear surface (base curve surface) of the lens. And (ii) Japanese Patent Application Laid-Open No. 11-52304 and Japanese Patent Application Laid-Open No. 2000-214417 disclose a lens center thickness dimension and a maximum thickness of a peripheral portion. A contact lens shape that specifies the thickness dimension and the position of the maximum thickness portion has been proposed.

  However, the shape of the contact lens disclosed in any of these publications has not been able to sufficiently satisfy both the wearing feeling and the handleability as described above. Basically, the lens thickness in the vicinity of the connecting part of the optical part and the peripheral part on the front surface of the lens or in the vicinity thereof is targeted so that a good shape retention characteristic can be exhibited while ensuring the wearing feeling is not significantly reduced. Since the lens thickness of such a part is set sufficiently large, the optical characteristics in the optical part can be designed by securing the lens thickness in such a part (the connection part between the optical part and the peripheral part on the front surface of the lens). However, there is a problem that the degree of freedom in designing the lens shape and the setting power is reduced.

That is, when designing a contact lens, first, in order to obtain a good wearing feeling and positional stability during wearing, the radius of curvature of the rear surface of the lens is determined as a base curve corresponding to the wearer's cornea shape, and then optical The shape of the front surface of the lens is designed so that the target lens power is realized in the section and the minimum thickness determined according to the material or the like is satisfied. According to the prior art described in the above, the lens thickness at the outer peripheral edge of the optical part on the front surface of the lens that determines the lens power is set to a specific value. The lens thickness is constrained, and as a result, the degree of freedom in designing the lens shape and the lens power is limited.
JP-A-8-286155 Japanese Patent Laid-Open No. 11-52304 JP 2000-214417 A

Here, the present invention has been made in the background as described above, and the problem to be solved is to realize a high degree of design retention characteristics and wearing feeling while ensuring a large degree of design freedom. It is an object of the present invention to provide a contact lens and a series of contact lenses having a novel shape that can be used.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. In addition, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized on the basis of.

That is, the first aspect of the present invention relating to a contact lens is provided with an optical part at the center of the lens and a peripheral part on the outer peripheral side of the optical part, and is used by being superposed on the surface of the cornea as a whole. In the contact lens, the optical power P of the optical part is set to −6 diopter ≦ P ≦ 0 diopter, and the optical part on the rear surface of the lens is more than the connection part of the optical part and the peripheral part on the front surface of the lens. And the peripheral connection portion are positioned outwardly in the lens radial direction orthogonal to the lens central axis, and the lens thickness on the lens central axis is 0.03 to 0.50 mm. The lens thickness of the connecting portion between the optical part on the front surface and the peripheral part is not less than the lens thickness on the lens central axis, and the optical part on the rear surface of the lens and the Side portion of the lens thickness of the connecting portion: T _BJ is, optical undergraduate and lens thickness of the connection portion of the peripheral portion of the lens front: the T _FJ above and has been that the contact lens, characterized.
Further, a second aspect of the present invention relating to a contact lens is the contact lens according to the first aspect, in the connection portion between the peripheral portion and the edge provided on the outer peripheral edge portion of the lens, The connecting portion between the peripheral portion and the edge and the connecting portion between the peripheral portion and the edge on the rear surface of the lens are positioned outward in the lens radial direction orthogonal to the lens central axis, and the peripheral portion on the front surface of the lens The lens thickness of the connection portion between the optical portion and the peripheral portion on the rear surface of the lens is: T _BJ It is characterized by being made smaller.
The first aspect of the present invention relating to the contact lens series is that the optical portion is provided at the center portion of the lens and the peripheral portion is provided on the outer peripheral side of the optical portion, and is worn on the surface of the cornea as a whole. The contact lens is a series of contact lenses prepared by combining a plurality of types of contact lenses having different lens powers P set for the optical part, and the lens power P of the optical part is “−10 diopter ≦≦ 10 In the contact lens set in a range of “P ≦ 0 diopter”, the connecting portion of the optical portion and the peripheral portion on the rear surface of the lens is orthogonal to the lens central axis rather than the connecting portion of the optical portion and the peripheral portion on the front surface of the lens. a lens radial direction while being brought positioned outside, the lens thickness on the lens center axis and 0.03~0.50mm to And with that, the optical undergraduate and lens thickness of the connection portion of the peripheral portion of the lens front: T _FJ are as above 0.05 mm, and optical undergraduate and lens connection part of the peripheral portion of the lens rear surface It is characterized by a series of contact lenses whose thickness: _TBJ is dimensioned according to the following conditional expression according to the lens power: P of the optical part.

Σ (A _i · 10 ⁻ⁱ · P ⁱ ) ≦ T _BJ / T _FJ ≦ Σ (B _i · 10 ⁻ⁱ · P ⁱ )
A ₀ = + 1.2382
A ₁ = −0.1741
A ₂ = −1.4711
A ₃ = −0.9355
B ₀ = + 1.4699
B ₁ = −0.2523
B ₂ = -1.9897
B ₃ = −1.2603

That is, the first aspect of the present invention relating to a series of contact lenses is that the present inventors have newly proposed that the shape retention characteristics of the lens by the optical unit differ depending on the shape of the lens front surface determined according to the lens power. As a result of paying attention and adding further studies, the connecting part between the optical part and the peripheral part on the front surface of the lens and the connecting part between the optical part and the peripheral part on the rear surface of the lens are separated from each other in the radial direction. By adjusting the relative ratio of the wall thickness in accordance with the lens power, it is possible to efficiently complement the lens shape retention effect in the optical part. As expressed by the formula, according to the lens power of the optical part, by setting so as to satisfy the specific conditions, while maintaining a good wearing feeling of the contact lens, excellent A than it has been found that the shape retention properties of the lens can be achieved, on the basis of this finding, it is the present embodiment may have been completed.

  In addition, in this aspect, by adopting a configuration in which the optical portion and the peripheral portion of the lens rear surface are separated from each other in the radial direction with respect to the optical portion and the peripheral portion of the lens front surface, Adjusting the relative ratio of the thickness dimension at the connecting part of the optical part and the peripheral part at the front and back surfaces of the lens as described above determined according to the lens power by the connecting part of the optical part and the peripheral part at the rear surface of the lens By doing so, the thickness of the connecting part between the optical part on the front of the lens and the peripheral part is set to the best value set based on the optical characteristics required for the optical part, etc. The lens shape retention characteristics can be improved to the required level by adjusting the thickness dimension of the connecting part between the optical part and the peripheral part on the rear surface of the lens while avoiding adverse effects on the lens as much as possible. is there.

  Furthermore, in this aspect, the lens thickness on the lens central axis is set to 0.03 to 0.50 mm, more preferably 0.05 to 0.50 mm, and the connection portion between the optical portion and the peripheral portion on the front surface of the lens is set. By setting the lens thickness to 0.05 mm or more, more preferably 0.10 mm or more, it becomes possible to align the shape including the thickness of the optical part according to the lens power. Therefore, the shape retention characteristics exhibited in the optical part can be grasped in a unified and accurate manner. By setting, it becomes possible to more stably realize the shape retention characteristic to the extent that good handleability is exhibited in the entire lens.

  Therefore, in a contact lens having a structure according to this aspect, a good shape retention characteristic can be efficiently realized in the entire lens while taking into account the shape retention characteristic in the optical part. It is possible to avoid problems such as reduced wear feeling due to having excessive shape retention characteristics and adverse effects on optical characteristics due to thickening, resulting in excellent wear feeling and good handling characteristics (handling Can be realized at the same time.

  The type and material of the contact lens to which this aspect is applied are not limited in any way, and any of them can be applied to various conventionally known contact lenses such as for myopia, presbyopia, and astigmatism. Is possible. The thickness dimension of the contact lens refers to the thickness in the radial direction at each part. For example, if the optical part on the rear surface of the lens is a spherical surface, the thickness is a straight line passing through the center of the contact lens. It can be specified by the lens thickness dimension in the linear direction. In addition, this aspect is intended for contact lenses having a lens power of −10 diopter to 0 diopter. Contact lenses in such a lens power range are generally in demand as lenses for correcting myopia. This is because it is provided to the market as a series of products that are different at predetermined intervals.

The second aspect of the present invention relating to the series of contact lenses has an optical portion provided at the center of the lens and a peripheral portion provided on the outer peripheral side of the optical portion, and is worn on the surface of the cornea as a whole. The contact lens is a series of contact lenses prepared by combining a plurality of types of contact lenses having different lens powers P for the optical part, and the lens power P of the optical part is “−6 diopters ≦ in P ≦ 0 diopters the contact lens which is set in a range of ", the lens thickness on the lens center axis is a 0.03～0.50Mm, connection of the peripheral portion and the optical portion of the lens front surface site of the lens thickness: while T _FJ is equal to or greater than 0.05 mm, after the lens than the connection portion of the optical undergraduate and the peripheral portion of the lens front surface Has been brought located outside a lens radial connecting portions of the optical undergraduate and the peripheral portion is perpendicular to the lens center axis in the plane, the lens thickness of the connection portion of the optical undergraduate and the peripheral portion in and take the lens rear surface S: T _BJ has a thickness dimension according to the following formula.
T _BJ / T _FJ ≧ 1

The second aspect of the present invention relating to such a series of contact lenses is also similar to the first aspect of the present invention relating to the series of contact lenses in the thicknesses at both the optical part and the peripheral part at the front and rear surfaces of the lens. By adjusting the relative ratio of dimensions according to the lens power, it is possible to efficiently obtain the shape retention effect of the entire lens while avoiding deterioration of wearing feeling due to thickening of the lens etc. Based on the basic technical idea that the present inventor has intensively studied, the present inventor has completed the present invention. In particular, this mode is applied to the optical unit when the lens power P is -6 to 0 diopter. It was completed based on the newly obtained knowledge that it is difficult to obtain an effective shape retention effect in the optical part when setting a preferable lens shape and thickness dimension. That is, the present embodiment targets a contact lens having a lens power of −6 diopter to 0 diopter. Generally, there is much demand for a lens for correcting myopia. For example, the range of the above-mentioned lens power provided as a series in the market. Among contact lenses of (−10 diopter ≦ P ≦ 0 diopter), particularly when the lens power: P is −6 to 0 diopter, the difference between the minimum thickness dimension and the maximum thickness dimension in the optical part is small. When the minimum thickness dimension is set to the minimum value required from the viewpoint of member strength and durability, it has a common characteristic that it is difficult to obtain the shape retention effect by the optical part, although a good wearing feeling can be obtained. This is based on what the inventor has newly paid attention to.

And, in the contact lens having a structure according to this aspect, while satisfying the setting of a preferable lens shape and thickness dimension in the optical part, in particular, more than the thickness dimension of the connection part between the optical part and the peripheral part in the front surface of the lens, By setting the thickness dimension of the connecting part of the optical part and the peripheral part on the rear surface of the lens large, it is possible to efficiently compensate for the shape retention effect that tends to be insufficient in the optical part in the peripheral part. While maintaining the optical characteristics required for the optical part, the wearing feeling due to the thin dimensions, and the like, an excellent shape retention effect as a whole lens is realized, and good handleability is exhibited. The upper limit of the value of T _BJ / _TFJ is determined in consideration of the feeling of wearing and taking into account the difference in sensitivity of each wearer, but in general, the value of _TBJ and _TFJ For each value, the minimum value is limited by the strength and durability retention limits required for each lens material, and the maximum value is limited by the feeling of wear and does not exceed 1.0 mm. There is no need to be particularly conscious of the upper limit of the value of T _BJ / _TFJ .

Further, a third aspect of the present invention relating to a series of contact lenses is a series of contact lenses according to the first or second aspect, wherein in the contact lens, the optical portion and the peripheral portion on the front surface of the lens. with the diameter of the connecting portion there is a 55 to 85% of the lens outside diameter, the diameter of the connection portion of the optical undergraduate and the peripheral portion of the lens rear surface is 70 to 90% of the lens outside diameter It is characterized by being. In such an aspect, even when various lens powers are set, the lens shape holding effect by the optical part and the lens shape holding effect by the peripheral part are complemented by at least one of them or by mutually complementing each other. As a result, it can be exhibited more effectively.

Further, a fourth aspect of the present invention relates to a series of contact lenses, superimposed on the surface of the cornea as a whole and the peripheral portion is provided on the outer peripheral side of the optical faculties with an optical unit is provided in the lens center part wear The contact lens series is a series of contact lenses prepared by combining a plurality of types of contact lenses having different lens powers P set with respect to the optical part, and the lens power of the optical part P is “P <−10”. In the contact lens set in the range of “diopter”, the lens diameter orthogonal to the lens central axis at the connection portion between the optical portion and the peripheral portion on the rear surface of the lens rather than the connection portion between the optical portion and the peripheral portion on the front surface of the lens. while being brought located outward in the direction, along with the lens thickness on the lens center axis is a 0.03～0.50Mm, Lens thickness of the connection portion of the optical undergraduate and the peripheral portion of the lens front: T _FJ are the least 0.05mm to and lens connection part of the optical undergraduate and the peripheral portion of the lens rear surface thickness: T _{The BJ} is characterized by a series of contact lenses having a thickness dimension according to the conditional expressions shown in (1) and (2) below according to the lens power: P of the optical part.

(1) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ <7.0 mm”
0.877 ≦ T _BJ / T _FJ ≦ 0.993
(2) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ ≧ 7.0 mm”
Σ (A _i · 10 ⁻ⁱ · P ⁱ ) ≦ T _BJ / T _FJ ≦ Σ (B _i · 10 ⁻ⁱ · P ⁱ )
A ₀ = + 1.7980
A ₁ = + 1.4330
A ₂ = + 0.5824
A ₃ = + 0.0814
B ₀ = + 2.0184
B ₁ = + 1.5827
B ₂ = + 0.6298
B ₃ = + 0.0871

In In such present embodiment the contact lens of construction according to, particularly those having a negative refractive power stronger than referred -10 diopters "high minus lens", the first aspect of the present invention relates to a series of the contact lens Similarly to the contact lens according to the above aspect, it is possible to effectively complement the shape retention effect by the peripheral portion while grasping and utilizing the shape retention effect of the lens by the optical unit. In addition, the peripheral part is shaped so as to satisfy specific conditions according to the lens power of the optical part, so that the design freedom of the optical characteristics of the optical part is sufficiently ensured and the wearing feeling of the contact lens is ensured. This makes it possible to achieve excellent lens shape retention characteristics while maintaining good.

In particular, in this embodiment, the shape of the peripheral part is set in consideration of the diameter dimension _DFOZ of the optical part on the front surface of the lens, so that the effect of maintaining the shape of the lens by the optical part can be grasped to a higher degree. Then, without excessively thickening the peripheral part, etc., the shape retention effect by the optical part is complemented more suitably by the peripheral part, and both the excellent shape retention effect and wearing feeling as a whole lens are achieved. Can be realized. In other words, when the optical part diameter is large, when the negative refracting power in the optical part becomes stronger, it becomes a problem by utilizing the effective shape retention effect in the optical part where the outer peripheral part is thick. It is possible to avoid excessive thickening in the peripheral part easily and achieve a good wearing feeling, and when the optical part diameter is small, the peripheral part is effective in maintaining the shape retention effect that tends to be insufficient in the optical part. It is possible to complement the above.

The fifth aspect of the present invention relating to the series of contact lenses is that an optical part is provided in the center part of the lens and a peripheral part is provided on the outer peripheral side of the optical part, and is superposed on the surface of the cornea as a whole. A series of contact lenses in which a plurality of contact lenses to be worn are arranged in combination with different lens powers P set for the optical part, and the optical power P of the optical part is “0 diopter < In the contact lens set in the range of “P”, the lens diameter of the optical portion and the peripheral portion connected at the rear surface of the lens is orthogonal to the lens central axis rather than the connecting portion between the optical portion and the peripheral portion at the front surface of the lens. while being brought located outward in the direction, along with the lens thickness on the lens center axis is a 0.03～0.50Mm, Les Lens thickness of the connection portion of the optical undergraduate and the peripheral portion in FIG Front: T _FJ are as above 0.05 mm, and the lens of the connection portion of the optical undergraduate and the peripheral portion of the lens rear surface thickness: T _BJ is characterized by a series of contact lenses having a thickness according to the following (1) and (2) according to the lens power: P of the optical part.

(1) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ <7.0 mm”
1.238 ≦ T _BJ / T _FJ ≦ 1.470
(2) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ ≧ 7.0 mm”
Σ (A _i · 10 ⁻ⁱ · P ⁱ ) ≦ T _BJ / T _FJ ≦ Σ (B _i · 10 ⁻ⁱ · P ⁱ )
A ₀ = + 1.2066
A ₁ = −0.0398
A ₂ = −0.1341
A ₃ = + 0.0139
B ₀ = + 1.4328
B ₁ = −0.0516
B ₂ = −0.1436
B ₃ = + 0.0153

In such a contact lens having a structure according to this embodiment, in particular, having a positive refractive power called “plus lens”, the contact lens has a structure according to the first embodiment of the present invention relating to the series of contact lenses . Similar to the contact lens, it is possible to effectively complement the shape retention effect by the peripheral portion while grasping and utilizing the shape retention effect of the lens by the optical unit. In addition, the peripheral part is shaped so as to satisfy specific conditions according to the lens power of the optical part, so that the design freedom of the optical characteristics of the optical part is sufficiently ensured and the wearing feeling of the contact lens is ensured. This makes it possible to achieve excellent lens shape retention characteristics while maintaining good.

In this embodiment, the shape of the peripheral portion is set in consideration of the diameter dimension D _FOZ of the optical portion on the front surface of the lens, so that the second embodiment of the present invention relating to the series of contact lenses is provided. As in the case of the contact lens according to the above, the shape retention effect of the peripheral portion corresponding to the shape retention effect by the optical unit is set, and the compatibility between the shape retention effect and the feeling of wear can be highly realized in the entire lens. That is, when the optical part diameter is large, when the positive refracting power in the optical part becomes stronger, it becomes a problem by utilizing the effective shape retention effect in the optical part where the central part is thick. It is possible to avoid excessive thickening in the peripheral part easily and achieve a good wearing feeling, and when the optical part diameter is small, the peripheral part is effective in maintaining the shape retention effect that tends to be insufficient in the optical part. It is possible to complement the above.

Further, a sixth aspect of the present invention relating to a series of contact lenses is a series of contact lenses according to any one of the first to fifth aspects, and in the contact lenses, at least one of a lens front surface and a lens rear surface. In the radial cross section, the optical section and each end of the peripheral section are connected with a common tangent line, and the tangential inclination angle is continuous between the optical section and each end section of the peripheral section. change and connecting surface having a smooth continuous surface shape is formed which, that the connection portion of the optical portion and the peripheral portion is formed by the connecting surface, characterized. In this embodiment, the optical part and the peripheral part, which have different cross-sectional shapes set so as to satisfy different required characteristics, can be smoothly smoothed by the connection surface formed with a predetermined radial width at the connection part. It is possible to connect, thereby causing an edge (bent point) to be formed at the connection part of the lens surface without affecting the shape of the optical part and the peripheral part, and hence the required characteristics. A reduction in wearing feeling can be advantageously avoided.

  In addition to the structure according to the sixth aspect, for example, when a relatively free lens surface shape design is allowed in the peripheral portion, at least one of the lens front surface and the lens rear surface, the outer peripheral edge portion of the optical portion By setting the inclination angle of the inner peripheral edge portion of the peripheral portion in contact with the optical device to be equal to the inclination angle of the outer peripheral edge portion of the optical portion, the optical portion and the peripheral portion are directly connected at the connection site and with a smooth surface having a common tangent line. By adopting such a lens surface shape, it is possible to further improve the feeling of wearing as in the case of the contact lens having the structure according to the sixth aspect.

  Further, a seventh aspect of the present invention relating to a series of contact lenses is a series of contact lenses according to any one of the first to sixth aspects, wherein in the contact lens, the peripheral portion on the lens front surface is It is characterized by having a radial cross-sectional shape defined by at least one of a quadratic polynomial, a conic curve, a spline curve, or a combination thereof. According to this aspect, the peripheral lens surface can be designed with a smooth surface shape and with a large degree of freedom, so that, for example, it has a common tangent directly to the optical part. In addition, the connection is made with a smooth surface, the target thickness dimension is set at the connection part between the optical part and the peripheral part on the rear surface of the lens, and the connection is made smoothly with the edge part formed on the outermost periphery of the lens. Thus, it is possible to easily set the lens surface shape of the peripheral portion on the front surface of the lens.

  Further, an eighth aspect of the present invention relating to a series of contact lenses is the series of contact lenses according to any one of the first to seventh aspects, and in the contact lens, in the radial cross section of the rear surface of the lens, It is characterized in that at least a part of the peripheral part has an arc shape. In this embodiment, the peripheral portion of the rear surface of the lens can be designed relatively easily. Preferably, the radius of curvature of the peripheral portion on the rear surface of the lens is set larger than the radius of curvature of the optical portion. In addition, two or more cross-sectional arc-shaped portions having different curvature radii are connected in the radial direction in the peripheral portion, and the outer peripheral side is positioned on the outer peripheral side of the cross-sectional arc-shaped portion located on the inner peripheral side near the optical unit. A configuration in which the circular arc-shaped portion to be formed has a large radius of curvature can also be advantageously employed.

  A ninth aspect of the present invention relating to a series of contact lenses is a series of contact lenses according to any one of the first to eighth aspects, wherein the contact lenses are soft contact lenses made of a soft material. It is characterized by being. According to this aspect, by applying the present invention to the soft contact lens, the lens power required for the optical part is ensured with high accuracy, and the optical part and the peripheral part are made sufficiently thin to allow oxygen permeability. The shape retention characteristic, which was a major problem in soft contact lenses, can be effectively improved while maintaining a high level of contact, thereby reducing clinging to the finger surface when placed on the finger during wearing, for example. As a result, good handling properties are exhibited, and the front and back of the lens can be easily determined.

The contact lenses according to the first to eighth aspects of the present invention related to the contact lens series are not only various soft contact lenses with high water content, medium water content, low water content, and non-water content, but also hard contact lenses. Therefore, it is possible to reduce the thickness of the lens while sufficiently ensuring the strength and deformation resistance characteristics of the entire lens. This makes it possible to improve the feeling of wearing and improve the overall handling and strength characteristics.

Furthermore, a third aspect of the present invention relates to a contact lens, when the optical unit is provided on the lens central portion periphery is provided on the outer peripheral side of the optical unit in co overlaid on the surface of the cornea as a whole A contact lens that is worn together and has a shape according to any one of the following conditions (i), (ii), and (iii) specified by the lens power of the optical unit: P a contact lens it is, and features.
(I) lens power: connection P are as "-10 diopters ≦ P ≦ 0 diopter", the optical undergraduate and the peripheral portion of the lens rear surface than the connecting portion of the peripheral portion and the optical portion of the lens front surface while the site is brought located outside a lens radial direction perpendicular to the lens center axis, together with the lens thickness on the lens center axis is a 0.03～0.50Mm, optical faculties in the lens front surface a lens thickness of the connection portion of the periphery: T _FJ are as above 0.05 mm, and the lens of the connection portion of the optical undergraduate and the peripheral portion of the lens rear surface thickness: T _B is light Faculty According to the lens power: P, the thickness dimension is as follows .
Σ (A _i · 10 ⁻ⁱ · P ⁱ ) ≦ T _BJ / T _FJ ≦ Σ (B _i · 10 ⁻ⁱ · P ⁱ )
A ₀ = + 1.2382
A ₁ = −0.1741
A ₂ = −1.4711
A ₃ = −0.9355
B ₀ = + 1.4699
B ₁ = −0.2523
B ₂ = -1.9897
B ₃ = −1.2603
(Ii) lens power: P are as "P <-10 diopters" optical undergraduate and connecting portion of the periphery lens in the lens rear surface than the connecting portion of the peripheral portion and the optical portion of the lens front surface while a lens radial direction perpendicular to the central axis are brought positioned outside, together with the lens thickness on the lens center axis is a 0.03～0.50Mm, optical undergraduate and the peripheral of the lens front surface Thickness: T _FJ is 0.05 mm or more at the connection portion of the portion, and the lens thickness: T _BJ of the connection portion between the optical portion and the peripheral portion on the rear surface of the lens is the lens power of the optical portion: According to P, it is set as the thickness dimension according to the conditional expression shown below.
(1) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ <7.0 mm”
0.877 ≦ T _BJ / T _FJ ≦ 0.993
(2) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ ≧ 7.0 mm”
Σ (A _i · 10 ⁻ⁱ · P ⁱ ) ≦ T _BJ / T _FJ ≦ Σ (B _i · 10 ⁻ⁱ · P ⁱ )
A ₀ = + 1.7980
A ₁ = + 1.4330
A ₂ = + 0.5824
A ₃ = + 0.0814
B ₀ = + 2.0184
B ₁ = + 1.5827
B ₂ = + 0.6298
B ₃ = + 0.0871
(Iii) lens power: P are as "P <-10 diopters" optical undergraduate and connecting portion of the periphery lens in the lens rear surface than the connecting portion of the peripheral portion and the optical portion of the lens front surface while a lens radial direction perpendicular to the central axis are brought positioned outside, together with the lens thickness on the lens center axis is a 0.03～0.50Mm, optical undergraduate and the peripheral of the lens front surface Thickness: T _FJ is 0.05 mm or more at the connection portion of the portion, and the lens thickness: T _BJ of the connection portion between the optical portion and the peripheral portion on the rear surface of the lens is the lens power of the optical portion: According to P, it is set as the thickness dimension according to the conditional expression shown below.
(1) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ <7.0 mm”
1.238 ≦ T _BJ / T _FJ ≦ 1.470
(2) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ ≧ 7.0 mm”
Σ (A _i · 10 ⁻ⁱ · P ⁱ ) ≦ T _BJ / T _FJ ≦ Σ (B _i · 10 ⁻ⁱ · P ⁱ )
A ₀ = + 1.2066
A ₁ = −0.0398
A ₂ = −0.1341
A ₃ = + 0.0139
B ₀ = + 1.4328
B ₁ = −0.0516
B ₂ = −0.1436
B ₃ = + 0.0153

Such a contact lens according to this aspect is also completed based on the basic technical idea similar to the invention related to the series of contact lenses, and the connection portion between the optical portion and the peripheral portion on the rear surface of the lens is connected to the front surface of the lens. By positioning the thickness of the connecting part of the rear surface of the lens in the radial direction from the connecting part of the optical part and the peripheral part in the peripheral part, while avoiding the influence on the optical characteristics of the optical part, the peripheral part In particular, by using the lens power of the optical part as a determination value of the lens shape, the shape holding effect in the optical part is taken into consideration. If it is not sufficient, it could be possible to increase the shape retention effect in the peripheral part and act to compensate for the shape retention effect of the optical part. As a result, while ensuring the optical characteristics of the optical part with high accuracy, the shape retaining effect of the peripheral part is appropriately adjusted according to the shape retaining effect of the optical part, and finally the small thickness dimension Thus, it is possible to advantageously and easily design a lens shape capable of realizing an effective shape retention effect as a whole lens.

Therefore, according to such essential like, while securing the optical properties with high precision, as a whole lens, good handling properties (handling property) and the contact lens capable of compatibly allowed highly realized wear comfort, ease Can be provided. Incidentally, essential-like, in particular, high water, medium water, low water, but is preferably employed with respect to non-hydrous various soft contact lenses, are also applicable to other hard contact lenses, it Accordingly, it is possible to advantageously realize improvement in wearing feeling and overall improvement in handling characteristics and strength characteristics while satisfying required optical characteristics.

Furthermore, in the third aspect of the present invention which relates to the contact lens, lens power: the condition that P is "-6 diopters ≦ P ≦ 0 diopters" preferentially than the (i) manner to the following (iv) to the slave cormorants shape can be preferably employed.
With (iv) the lens center axis on the lens thickness is a 0.03～0.50Mm, the optical unit and the lens thickness of the connection portion of the peripheral portion of the lens front: T _FJ is more 0.05mm It was located outward in a by one and the lens radial connecting portions of the optical undergraduate and the peripheral portion of the lens rear surface than the connecting portion of the optical undergraduate and the peripheral portion is orthogonal to the lens center axis in the lens front surface lens thickness to be provided, the connection portion of the optical undergraduate and the peripheral portion in and take the lens rear surface: T _BJ is a thickness according to the conditional expression shown below.
T _BJ / T _FJ ≧ 1
According to such essential like, lens power: near if P is 0-6 diopters, when setting the preferred lens shape and thickness in the optical unit, the likely shape retention effect becomes insufficient in the optical unit This makes it possible to efficiently compensate for the lens, thereby maintaining high optical characteristics required for the optical unit and wearing feeling due to the thin dimensions, while maintaining good handling characteristics based on the excellent shape retention effect of the entire lens. Therefore, it is possible to easily realize the shape design of the contact lens that can exhibit the above.

Incidentally, the fabrication of a contact lens according to the present onset bright relates to a contact lens, so as to realize the determined lens shape, are carried out according to various known contact lens manufacturing method conventionally by considering the material and lens power, etc. For example, in addition to manufacturing by cutting and polishing a polymer, the monomer composition is injected into a mold having a molding cavity having a target lens shape and molded simultaneously with polymerization, or By molding one lens surface at the same time as polymerization and molding the other lens surface by cutting and polishing, or by injecting the monomer composition into a rotary mold and spin casting by centrifugal force, etc. It can be advantageously manufactured.

  As is clear from the above description, in the contact lens having the structure according to the present invention, the connecting portion between the optical portion and the peripheral portion on the rear surface of the lens is more radially outward than the connecting portion between the optical portion and the peripheral portion on the front surface of the lens. In accordance with the lens power set in the optical section, the relative ratio of the wall thickness dimensions at both the rear and front connection parts of the lens is determined according to specific conditions. By adjusting and setting to satisfy, the entire lens is thin enough to keep the wearing feeling good, while giving the lens a good shape retention characteristic and exhibiting good handling characteristics Is possible.

Further, according to the present onset bright, taking into account the lens power, setting the relative thickness of the connecting portion of the optical portion and the peripheral portion of the connecting portion and the lens front surface of the optical portion and the peripheral portion of the lens rear surface As a result, it is possible to grasp both the shape retention effect by the optical part and the shape retention effect by the peripheral part as a whole, and as a result, the lens shape retention characteristic is effectively prevented while avoiding the thickening of the lens. It is possible to provide a design, and it is possible to easily provide a contact lens design that can be realized at a high level while achieving both excellent wearing feeling and good handleability.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIGS. 1 and 2 show a specific structural example of the contact lens 10 having a structure according to the present invention. The contact lens 10 has a substantially spherical shell shape as a whole, and is used by being worn while being superimposed on the surface of the cornea in the eyeball, as is well known. Note that the contact lens 10 of the present embodiment has a lens central axis as an optical axis, and has a rotating body shape around the lens central axis 14, so that only a longitudinal section in the radial direction is shown in FIG. Let me show you.

More specifically, a circular front optical part 19 and a rear optical part 18 are formed on the front and rear surfaces of the contact lens 10 of the present embodiment, respectively. In the central portion of the lens, an optical zone in which an appropriate lens power for correcting vision is set is formed. The front optical unit 19 and the rear optical unit 18 are both circular with the lens center axis 14 as the center when viewed from the front in the optical axis direction. diameter are different from each other, the outer diameter of the front optical zone 19: D _FOZ lens outside diameter: while it is set to approximately 60% and D, the outer diameter of the rear optical unit 18: D _BOZ is The lens outer diameter dimension is set to approximately 80% of D. The outer diameter of the contact lens 10: D and the outer diameter of the front and rear surfaces optic 19,18: D _FOZ, D _BOZ etc., taking into account the size and wearing conditions of the cornea or sclera of the wearer Although it is appropriately set and is not limited, in order to realize good optical characteristics, tear fluid exchangeability and lens position stability, generally 0.55 ≦ D _FOZ / D ≦ 0 .85 and 0.70 ≦ D _BOZ /D≦0.90.

Further, the rear optical part 18 of the contact lens 10 is located behind the lens (on the right side in FIG. 1) on the lens central axis 14 so as to be substantially similar to the surface of the cornea to be attached under wearing condition. The center of curvature is set, and the base curve surface has a concave vertical cross-sectional shape having an appropriate radius of curvature: r _BOZ . Thereby, the layer thickness dimension of the tear film formed between the rear optical part 18 and the surface of the cornea under the wearing state of the contact lens 10 is made substantially constant over the whole, and the lens action by the tear film is performed. Is reduced or avoided. As the vertical section shape of the base curve surface, taking into account the wearer's cornea shapes and wearing conditions, the radius of curvature: other r _BOZ is constant arc shape, the radius of curvature: r _BOZ is radially Various curved concave shapes such as a conical curve shape that changes in the above can be appropriately adopted. The rear optical unit 18 has, for example, a rotating body shape having the lens center axis 14 as a rotation center axis.

On the other hand, the front optical part 19 of the contact lens 10 is designed as a curved surface shape capable of giving a target lens power in cooperation with the base curve surface set as described above. A center of curvature is set behind the lens on the lens center axis 14 to form a curved convex surface having a longitudinal cross-sectional shape with an appropriate radius of curvature: r _FOZ . The front optical part (front curve surface) 19 also takes into account the shape of the base curve surface 18, the required lens power, wearing conditions, and the like, for example, in addition to an arc shape with a constant curvature radius: r _BOZ , a curvature. Radius: Various curved convex shapes such as a conical curve shape in which r _BOZ changes in the radial direction can be appropriately employed. The front optical unit 19 has, for example, a rotating body shape having the lens center axis 14 as the rotation center axis.

  The optical part formed by the front and rear optical parts 19 and 18 is an area where an optical effect on the eyes of the wearer is expected, and the outer peripheral part, in other words, the boundary with the peripheral part described later. In general, it can be considered as a change point of curvature on the longitudinal section on the front surface and the rear surface of the lens respectively. For example, it is designed with a longitudinal section shape in which the lens surface of the optical unit gradually changes in the radial direction. Or when the boundary is formed with a predetermined width in the radial direction and is formed by a connection region that smoothly connects the optical part and the peripheral part between the lens front and back surfaces, etc. Is not necessarily clear as a line in terms of shape.

  In addition, a peripheral zone and an edge are formed on the outer peripheral portion of the contact lens 10 so as to surround the optical portion. The edge 24 is formed in an annular shape at the outermost peripheral edge of the contact lens 10, and the front and rear surfaces of the chamfered lens formed inwardly extending from the substantially semicircular outer peripheral end surface in the longitudinal direction of the lens. The lens front and rear surfaces of the edge 24 are connected to the front and rear surface peripheral portions 26 and 28 by the chamfered lens front and rear surfaces. In the drawing, a chamfered lens surface is clearly shown between the front peripheral portion 26 and the edge 24 only on the front surface of the lens.

Furthermore, the peripheral portion is formed by the front and rear surface peripheral portions 26 and 28 of the lens positioned on the outer peripheral side of the front and rear surface optical portions 19 and 18. Each of the front and rear surface peripheral portions 26 and 28 has an annular shape continuously extending in the circumferential direction with a predetermined radial width dimension around the lens central axis 14, and its radial width dimension: B _FPZ , B _BPZ are different from each other, but the front and rear surface optical portions 19 and 18 of the contact lens 10 and the lens 24 of the edge 24 are provided between the front and rear surfaces of the front and rear surface peripheral portions 26 and 28. The inner peripheral edge portions of the front and rear surface peripheral portions 26 and 28 of the contact lens 10 are connected to the front and rear surface optical portions 19 and 18.

Here, the rear peripheral portion 28 in the peripheral portion has a vertical cross-sectional shape of a single circular arc shape having a predetermined radius of curvature: r _BPZ and various types in which the radius of curvature: r _BPZ varies in the radial direction. The shape can also be adopted as appropriate, for example, a plurality of circular arc shapes connected with a radius of curvature gradually increasing outward in the radial direction, a polynomial shape having a radius of curvature gradually increasing outward in the radial direction, and a cone Various shapes such as a curved shape can be appropriately employed. The connecting portion 30 (referred to as “back junction”) 30 between the rear optical portion 18 and the rear peripheral portion 28 may be a break point in the longitudinal section, but the rear optical portion 18 and the rear peripheral portion 28 have a common tangent. It is possible to set the shape to be connected, or an appropriate arc may be attached so as not to have a clear edge, and the connecting portion 30 may be smoothly formed with a predetermined width in the lens radial direction. . Such a rear surface peripheral portion 28 is generally set with an appropriate radius of curvature in consideration of tear fluid exchange in the tear film formed between the contact lens 10 and the cornea. In such a vision correction contact lens, the rear peripheral portion 28 is formed with a larger radius of curvature than the rear optical portion 18.

  On the other hand, the front peripheral portion 26 in the peripheral portion is set with a special curved shape in consideration of the shape retention effect in the optical portion in the longitudinal cross-sectional shape, thereby effective for the contact lens. The shape retention effect is efficiently exhibited by the cooperation of the optical part and the peripheral part.

That is, first, the thickness of the optical part of the contact lens 10 is such that the thickness dimension on the lens central axis 14: T _C is 0.03 mm ≦ T _C ≦ 0.50 mm and the front surface of the lens. The thickness dimension at the connection part (referred to as “front junction”) 32 between the optical part and the peripheral part: _TFJ is set to be 0.05 mm ≦ _TFJ .

For example, in the case of designing a myopia (minus diopter) contact lens, first, the shape of the base curve (rear optical unit) 18 is determined in consideration of the surface shape of the cornea to be worn. Then, in consideration of the shape of the base curve 18, the shape of the front optical unit 19 that achieves the required lens power is designed. Subsequently, the outer peripheral edge of the designed front optical part 19, that is, the relative position of the front junction 32 with respect to the base curve 18 is set so that the thickness dimension at the front junction 32: _TFJ is 0.05 mm. Temporarily set, and check the value of the thickness dimension: T _C on the lens central axis 14 under such a temporarily set state. Then, it is determined whether or not the value of the thickness dimension: T _C is 0.03 mm or more. If 0.03 mm ≦ T _C , the temporarily set front optical part 19 is adopted as a regular shape. To. On the other hand, the judgment result, the thickness dimension of on the lens center axis 14: If it is less than the value from T _C within 0.03 mm, the thickness of the front junction 32: Change slightly increasing the value of T _FJ Redo the provisional setting, the same determination method thickness of on the lens center axis 14 by: values from T _C is working configuration changes until satisfy the conditions of 0.03mm ≦ T _C ≦ 0.50mm The provisional setting value when such conditions are satisfied is adopted as the normal shape of the lens front surface (front surface optical unit 19) of the optical unit.

In the case of designing a contact lens for hyperopia (plus diopter), the same method is basically followed. For example, when temporarily setting the relative position of the front junction 32 with respect to the base curve 18, first, the lens central axis is used. 14 Thickness dimension: Temporarily set so that the value of T _C becomes 0.03 mm, and the thickness dimension at the front junction 32 under such temporary setting state: the value of T _FJ is 0.05 mm or more. By determining whether or not the lens shape of the front optical unit 19 is designed so that the thickness dimension on the lens central axis 14 and the thickness dimension at the front junction both satisfy the above condition. Can be suitably employed.

As is clear from this, even in a contact lens having positive or negative refractive power, the value of T _FJ is 0.05 mm or more and the upper limit is within a range satisfying 0.03 mm ≦ T _C ≦ 0.5 mm. Is set to a sufficiently small size. Further, the value of T _C is in the range of 0.03 mm to 0.50 mm, and the value of T _FJ is in the range of 0.05 mm or more, and the conditions can be appropriately set in consideration of the lens material and the like.

That is, according to such a design method, the lens center axis 14 on the lens thickness: with T _C is 0.03～0.50Mm, connecting site of the front optical portion 19 and the front peripheral portion 26 of the lens front surface The lens shape of the optical part having a lens thickness dimension of 32: T _FJ of 0.05 mm or more can be designed efficiently. Moreover, the optical part designed to satisfy such a lens thickness condition has an outer diameter dimension appropriately determined, but has substantially the same shape and thickness according to the set lens power. . The specific values of T _FJ and T _C described above are not limited to those shown as examples. For example, when designing a contact lens for myopia, first, the value of T _FJ is set to 0.10 mm or 0.05 mm or more. and sets to an arbitrary value of, so that the values from T _C satisfies 0.03mm ≦ T _C ≦ 0.50mm, or smaller specific area conditions, such as 0.05mm ≦ T _C ≦ 0.50mm May be set.

  And, for various soft contact lenses with various base curves, front curves, and lens powers designed in this way, each of them is manufactured with various shapes and thickness dimensions of the peripheral part. The soft contact lenses were evaluated by a number of monitors with experience wearing contact lenses. As shown in the following [Table 1], some of the evaluation results include front / back determination evaluation that also handles the handling properties of the soft contact lens, evaluation of wearing feeling such as foreign body feeling and stimulation, and visual or This was performed by optical fitting evaluation. Since the evaluation carried out is enormous, here, the posting of each individual evaluation data is omitted, and a graph obtained by statistically processing a large number of obtained evaluation data is shown in FIG.

Further, in a positive refractive power lens with a lens power: P that is greater than 0 diopter and a negative negative power lens that is more negative than −10 diopter, −10 diopter ≦ P ≦ Unlike a contact lens having a lens power of 0 diopter: P, it is appropriate to consider the evaluation results separately according to the diameter of the optical part, specifically, the value of the outer diameter of the optical part on the front surface of the lens: _DFOZ .

That is, first, in a contact lens having a high or negative refractive power of P <−10 diopter, as a result of statistical processing of many obtained evaluation data, when D _FOZ <7 mm, the lens power: P is different. However, the evaluation result in the case of “P = −10 diopter” was not significantly changed. However, in the case of D _FOZ ≧ 7 mm, the evaluation result based on the shape and thickness of the peripheral portion is the lens power: P FIG. 4 is a graph showing a result of statistical processing of a large number of obtained evaluation data.

Similarly, in the case of a contact lens having a positive refractive power of 0 diopter <P, a large number of obtained evaluation data are statistically processed. As a result, when D _FOZ <7 mm, the lens power: P is different. The evaluation result in the case of “P = 0 diopter” was not significantly changed. However, in the case of D _FOZ ≧ 7 mm, the evaluation result based on the shape and thickness of the peripheral portion is the value of the lens power: P. FIG. 5 is a graph showing a result of statistical processing of a large number of obtained evaluation data.

  In addition, although the material of the contact lens employ | adopted for the above-mentioned evaluation whose result was shown in FIGS. 3-5 was a HEMA (hydroxyethyl methacrylate) type | system | group, it is generally employ | adopted also about the soft contact lens which consists of other materials. Similar evaluation results have been confirmed as long as they have the strength characteristics of the material to be obtained.

3, 4, and 5, the area sandwiched between the upper limit evaluation line and the lower limit evaluation line is a range in which the evaluation results of most monitors are good in terms of front / back determination, wearing feeling, and fitting characteristics. is there. As is apparent from this result, as described above, with respect to the thickness of the optical part, the thickness on the lens central axis 14: T _C is 0.03 mm ≦ T _C ≦ 0.50 mm, and the lens the thickness of the connection portion 32 of the front optical portion 19 and the front peripheral portion 26 on the front: in the design contact lens as the value of T _FJ satisfies the conditions to be 0.05 mm ≦ T _FJ, wearing As for the quality of the feeling and handling (front / back judgment, etc.), the specified lens power (POWER): P value and the ratio between the back junction and the front junction: T _BJ / _TFJ It is recognized that there is a relationship.

From such an evaluation result (especially, see FIG. 3), first, when the lens power: P is −6 diopter ≦ P ≦ 0 diopter, as described above, the lens center axis Thickness dimension on 14: T _C value is 0.03 mm ≦ T _C ≦ 0.50 mm, and thickness dimension at connecting portion 32 of front optical part 19 and front peripheral part 26 in front of the lens: T _FJ Is set to 0.05 mm ≦ T _FJ, and the back junction 30 is positioned radially outward from the front junction 32, and the ratio of lens thickness dimensions at the front junction 32 and the back junction 30 is: It is effective to set the value of T _BJ / _TFJ to at least 1 or more, thereby avoiding excessive thickening of the lens thickness and realizing good wear feeling with a thin thickness. Part The definitive shape retention characteristics is compensated at the peripheral portion is the is found that is possible to allowed to achieve a good shape retention property as a whole lens.

In short, with conventional contact lenses, it is considered effective to improve the shape retention characteristics to set a large thickness of the front junction, as described in the above-mentioned publication. In general, the thickness of the back junction is set to be smaller than that of the front junction. As is apparent from the above evaluation results, the thickness dimension on the lens central axis 14 and As a result of adopting the specific lens shape as described above with respect to the thickness dimension at the front junction 32 and the relative positional relationship between the back junction 30 and the front junction 32, at least in the range of −6 diopter ≦ P ≦ 0 diopter, Thickness dimension: _TBJ Front junction 32 thickness dimension: T It is effective to set a value larger than _FJ , which makes it possible to achieve both good wearing feeling and easy handling.

Further, secondly, from the above evaluation results (especially, see FIGS. 3, 4 and 5), as described above, the thickness dimension on the lens central axis 14: T _C is 0.03 mm ≦ T _C ≦ The thickness dimension at the connecting portion 32 of the front optical part 19 and the front peripheral part 26 at the front surface of the lens is 0.50 mm, and the value of T _FJ is 0.05 mm ≦ T _FJ, and from the front junction 32 The back junction 30 is positioned radially outward, and the ratio of the lens thickness dimensions at the front junction 32 and the back junction 30: the value of T _BJ / _TFJ is specified according to the value of the lens power: P It is recognized that a good wearing feeling and handleability can be achieved at the same time by determining so as to satisfy the following conditional expression.

  The conditional expression can be expressed as follows using the upper limit evaluation line and the lower limit evaluation line shown in FIGS.

(I) Lens power: When P is −10 diopter ≦ P ≦ 0 diopter Σ (A _i · 10 ⁻ⁱ · P ⁱ ) ≦ T _BJ / T _FJ ≦ Σ (B _i · 10 ⁻ⁱ · P ⁱ )
However, A ₀ = + 1.2382
A ₁ = −0.1741
A ₂ = −1.4711
A ₃ = −0.9355
B ₀ = + 1.4699
B ₁ = −0.2523
B ₂ = -1.9897
B ₃ = −1.2603

(II) Lens power: When P is P <−10 diopter (high minus)
(1) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ <7.0 mm”
0.877 ≦ T _BJ / T _FJ ≦ 0.993
(2) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ ≧ 7.0 mm”
Σ (A _i · 10 ⁻ⁱ · P ⁱ ) ≦ T _BJ / T _FJ ≦ Σ (B _i · 10 ⁻ⁱ · P ⁱ )
However, A ₀ = + 1.7980
A ₁ = + 1.4330
A ₂ = + 0.5824
A ₃ = + 0.0814
B ₀ = + 2.0184
B ₁ = + 1.5827
B ₂ = + 0.6298
B ₃ = + 0.0871

(III) Lens power: When P is 0 <P diopter (positive refractive power)
(1) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ <7.0 mm”
1.238 ≦ T _BJ / T _FJ ≦ 1.470
(2) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ ≧ 7.0 mm”
Σ (A _i · 10 ⁻ⁱ · P ⁱ ) ≦ T _BJ / T _FJ ≦ Σ (B _i · 10 ⁻ⁱ · P ⁱ )
However, A ₀ = + 1.2066
A ₁ = −0.0398
A ₂ = −0.1341
A ₃ = + 0.0139
B ₀ = + 1.4328
B ₁ = −0.0516
B ₂ = −0.1436
B ₃ = + 0.0153

  In each of the graphs of FIGS. 3, 4, and 5, in order to facilitate understanding of the present embodiment, the upper and lower limit evaluation lines employed within the range of the lens power: P applied respectively are the above conditions. The result obtained approximately according to the equation is shown as a polynomial.

  The embodiment of the present invention has been described in detail above. However, this is merely an example, and the present invention will be described in more detail with reference to a specific description in the above solution and embodiment section. It should be understood that the description is not intended to be construed as limiting in any way.

  For example, in the above embodiment, the case where the present invention is applied to a soft contact lens has been described. However, the present invention can also be applied to a hard contact lens made of various known hard lens materials. This makes it possible to advantageously realize a hard-type contact lens that is thin and excellent in wearing feeling, and that has excellent strength characteristics, shape stability, and deformation resistance.

In particular, according to the method of the present invention, the ratio of the lens thickness dimensions at the front junction 32 and the back junction 30: T _BJ / _TFJ , and the lens power: P, satisfy a specific conditional expression. The value of the specific conditional expression that is actually adopted can be adjusted according to the material of the contact lens, and such specific conditions It is also possible to limit the value of the expression to a narrower range within the range included in the range of the conditional expression of the present invention.

More specific shapes of contact lenses designed according to the present invention are shown in FIGS. 6 to 12, in order to facilitate understanding thereof, the same reference numerals and symbols as those of the above embodiment are attached to the respective parts corresponding to the above embodiment in the drawings. The dimensions of each part are clearly shown in the drawing. In each of the contact lenses of the examples, the values of the lens outer diameter dimension: D and the optical part outer diameter dimension: D _{BOZ on} the rear surface of the lens were set to D = 14 mm and D _BOZ = 11 mm.

That is, the contact lens of Example 1 shown in FIG. 6 has, in a longitudinal section, the outer diameter dimension of the optical part on the front surface of the lens: D _FOZ = 8 mm, and the rear optical part 18 of the optical part has a radius of curvature: r _BOZ = 8. The front optical unit 19 has an arc shape with a radius of curvature: r _FOZ = 8.9370 mm, and the lens power is P = −3.00 diopter. . Further, the thickness dimension on the lens central axis 14 is T _C = 0.095 mm, and the thickness dimension of the front junction 32 is T _FJ = 0.144 mm. Furthermore, the rear surface peripheral portion 28 of the peripheral portion has an arc shape with a radius of curvature: r _BPZ = 8.6231 mm.

Under such conditions, the ratio of the thickness dimensions of the back junction 30 and the front junction 32: T _BJ / _TFJ is set so as to satisfy the conditions of the upper and lower limit evaluation lines shown in FIG. Conditions were determined so as to be 1.25, and the shape of the front peripheral portion 26 of the peripheral portion was set. In this embodiment, in addition to passing the point of the thickness dimension of the back junction 30: T _BJ = 0.18 mm, the inner and outer peripheral edges of the peripheral portion are located at the outer peripheral edge of the optical portion and the inner peripheral edge of the edge. The cross-sectional shape of the front peripheral portion 26 in the peripheral portion is determined on the condition that the inner peripheral portion of the front peripheral portion 26 is connected to the outer peripheral portion of the front optical portion 19 with a common tangent line. The third order polynomial is set such that the distance from the lens center axis 14 is x. A polynomial representing the shape of the front peripheral portion 26 determined in this way is shown below.

f (x) = ax ³ + bx ² + cx + d
However, a = −1.96075 × 10 ⁻²
b = 1.695722 × 10 ⁻¹
c = −9.15919 × 10 ⁻¹
d = 9.75528

  The contact lens having such a shape satisfies the conditions of the present invention, and can exhibit excellent handling properties such as ease of determination of the front and back, together with excellent wearing feeling. It has been confirmed.

Next, in the contact lens of Example 2 shown in FIG. 7, in the longitudinal section, the outer diameter of the optical part on the front surface of the lens: D _FOZ = 8 mm, and the rear optical part 18 of the optical part has a radius of curvature: r _BOZ = In addition to the arc shape of 8.40 mm, the front optical unit 19 has an arc shape with a radius of curvature: r _FOZ = 8.5959 mm, and thereby the lens power: D = −1.00 diopter. Yes. Further, the thickness dimension on the lens center axis 14 is T _C = 0.12 mm, and the thickness dimension of the front junction 32 is T _FJ = 0.129 mm. Furthermore, the rear surface peripheral portion 28 of the peripheral portion has an arc shape with a radius of curvature: r _BPZ = 8.6231 mm.

Under such conditions, the ratio of the thickness dimensions of the back junction 30 and the front junction 32: T _BJ / _TFJ is set so as to satisfy the conditions of the upper and lower limit evaluation lines shown in FIG. Conditions were determined so as to be 1.30, and the shape of the front peripheral portion 26 of the peripheral portion was set. In this embodiment, in addition to passing the point of the thickness dimension of the back junction 30: T _BJ = 0.168 mm, the inner and outer peripheral edges of the peripheral portion are the same as the outer peripheral edge of the optical portion as in the first embodiment. As long as it is connected to the inner peripheral edge of the edge, and further the inner peripheral edge of the front peripheral part 26 is connected to the outer peripheral edge of the front optical part 19 with a common tangent, the front periphery of the peripheral part The cross-sectional shape of the portion 26 was set by a cubic polynomial with the distance from the lens central axis 14 being x. A polynomial representing the shape of the front peripheral portion 26 determined in this way is shown below.

f (x) = ax ³ + bx ² + cx + d
However, a = −2.36813 × 10 ⁻²
b = 2.40855 × 10 ⁻¹
c = −1.31558
d = 1.04573 × 10

  The contact lens provided with such a shape also satisfies the conditions of the present invention, similar to that of Example 1, and has excellent wear feeling and excellent front / back determination ease. It has been confirmed that handling properties can be exhibited.

Further, in the contact lens of Example 3 shown in FIG. 8, in the longitudinal section, the outer diameter dimension of the optical part on the front surface of the lens: D _FOZ = 8 mm, and the rear optical part 18 of the optical part has a vertex radius: Vr _BOZ = 8.40 mm, eccentricity: e = 0.5 The lens center axis 14 is a conic curved surface that is a rotation quadratic surface having the rotation center axis, and the front optical unit 19 has a vertex radius: Vr _FOZ = 8. .93699 mm, conic coefficient: k = 0.148193, and a conic curved surface that is a rotating quadratic surface with the lens central axis 14 as the rotation center axis, and thereby the lens power: D = −3.00 diopter. ing. In addition, the thickness dimension on the lens central axis 14 is T _C = 0.095 mm, and the thickness dimension of the front junction 32 is T _FJ = 0.137 mm. Further, the rear surface peripheral portion 28 of the peripheral portion is a conical curved surface that is a rotation quadratic surface having the lens central axis 14 with a vertex radius: Vr _BPZ = 8.754555 mm and an eccentricity: e = 0.5 as a rotation center axis. ing.

Under such conditions, the ratio of the thickness dimensions of the back junction 30 and the front junction 32: T _BJ / _TFJ is set so as to satisfy the conditions of the upper and lower limit evaluation lines shown in FIG. Conditions were determined so as to be 1.25, and the shape of the lens front surface 26 in the peripheral portion was set. In this embodiment, in addition to passing the point of thickness dimension of the back junction 30: T _BJ = 0.171 mm, the inner and outer peripheral edges of the peripheral portion are the same as the outer peripheral edge of the optical portion as in the first embodiment. As long as it is connected to the inner peripheral edge of the edge, and further the inner peripheral edge of the front peripheral part 26 is connected to the outer peripheral edge of the front optical part 19 with a common tangent, the front periphery of the peripheral part The cross-sectional shape of the portion 26 was set by a cubic polynomial with the distance from the lens central axis 14 being x. A polynomial representing the shape of the front peripheral portion 26 determined in this way is shown below.

f (x) = ax ³ + bx ² + cx + d
However, a = −1.09356 × 10 ⁻²
b = 6.79957 × 10 ⁻²
c = −5.1568 × 10 ⁻¹
d = 9.221201

  The contact lens provided with such a shape also satisfies the conditions of the present invention in the same manner as in Examples 1 and 2, and in combination with excellent wearing feeling, front and back determination ease, etc. It has been confirmed that excellent handling properties can be exhibited.

Furthermore, the contact lens of Example 4 shown in FIG. 9 has an optical part outer diameter of the front surface of the lens: D _FOZ = 6 mm in the longitudinal section, and the rear optical part 18 of the optical part has a radius of curvature: r _BOZ = 8. The front optical unit 19 has an arc shape with a radius of curvature: r _FOZ = 11.7739 mm, and thus the lens power: D = -15.00 diopter high minus Has been. Further, the thickness dimension on the lens central axis 14 is T _C = 0.08 mm, and the thickness dimension of the front junction 32 is T _FJ = 0.230 mm. Furthermore, the rear surface peripheral portion 28 of the peripheral portion has an arc shape with a radius of curvature: r _BPZ = 8.6231 mm.

And under these conditions, the following formula applies to contact lenses with high minus D _FOZ <7mm:
0.877 ≦ T _BJ / T _FJ ≦ 0.993
The ratio of the thickness dimensions of the back junction 30 and the front junction 32 is determined so that the value of T _BJ / T _FJ is 0.90, so that the front peripheral portion 26 of the peripheral portion is satisfied. Set the shape. In this embodiment, in addition to passing the point of the thickness dimension of the back junction 30: T _BJ = 0.207 mm, the inner and outer peripheral edges of the peripheral portion are located on the outer peripheral edge of the optical portion and the inner peripheral edge of the edge. The cross-sectional shape of the front peripheral portion 26 in the peripheral portion is determined on the condition that the inner peripheral portion of the front peripheral portion 26 is connected to the outer peripheral portion of the front optical portion 19 with a common tangent line. The third order polynomial is set such that the distance from the lens center axis 14 is x. A polynomial representing the shape of the front peripheral portion 26 determined in this way is shown below.

f (x) = ax ³ + bx ² + cx + d
However, a = −2.53921 × 10 ⁻³
b = −9.888608 × 10 ⁻²
c = 3.998225 × 10 ⁻¹
d = 7.85502

  The contact lens having such a shape satisfies the conditions of the present invention, and can exhibit excellent handling properties such as ease of determination of the front and back, together with excellent wearing feeling. It has been confirmed.

Next, the contact lens of Example 5 shown in FIG. 10 has a rear optical part 18 except that the optical part outer diameter dimension D _FOZ of the lens front surface is set to D _FOZ = 8 mm. Radius of curvature: r _BOZ = 8.40, radius of curvature of the front optical part 19: r _FOZ = 11.77739 mm, lens power: D = -15.00 diopter, thickness dimension on the lens central axis 14: T _C = It is 0.08 mm, and is the same as the contact lens of Example 4 shown in FIG. Further, the rear peripheral portion 28 of the peripheral portion also has a curvature radius: r _BPZ = 8.6231 mm, as in the fourth embodiment. In short, the contact lens of the fifth embodiment is a high-minus lens having the same basic optical characteristics as the contact lens of the fourth embodiment, and the outer diameter dimension D _{FOZ of the} front optical unit 19 is the same as that of the first embodiment. It is set larger than that in Example 4. The lens front surface of the optical outer diameter: by D _FOZ is large, the thickness dimension of the front junction 32: T _FJ also be a T _FJ = 0.348mm, greater than that of Example 4 It has become.

Under these conditions, each of the back junction 30 and the front junction 32 is satisfied so as to satisfy the conditions of the upper and lower limit evaluation lines shown in FIG. 4 applied to the contact lens with high minus D _FOZ ≧ 7 mm. Thickness ratio: Conditions were determined so that the value of T _BJ / _TFJ was 0.70, and the shape of the front peripheral portion 26 in the peripheral portion was set. In this embodiment, in addition to passing the point of the thickness dimension of the back junction 30: T _BJ = 0.244 mm, the inner and outer peripheral edges of the peripheral portion are connected to the outer peripheral edge of the optical portion and the inner peripheral edge of the edge. The cross-sectional shape of the front peripheral portion 26 in the peripheral portion is determined on the condition that the inner peripheral portion of the front peripheral portion 26 is connected to the outer peripheral portion of the front optical portion 19 with a common tangent line. The third order polynomial is set such that the distance from the lens center axis 14 is x. A polynomial representing the shape of the front peripheral portion 26 determined in this way is shown below.

f (x) = ax ³ + bx ² + cx + d
However, a = 2.87579 × 10 ⁻²
b = −6.27877 × 10 ⁻¹
c = 3.28142
d = 2.85956

  The contact lens having such a shape satisfies the conditions of the present invention, and can exhibit excellent handling properties such as ease of determination of the front and back, together with excellent wearing feeling. It has been confirmed.

Next, in the contact lens of Example 6 shown in FIG. 11, in the longitudinal section, the outer diameter of the optical part on the front surface of the lens: D _FOZ = 6 mm, and the rear optical part 18 of the optical part has a radius of curvature: r _BOZ = The front optical unit 19 has an arc shape with a radius of curvature: r _FOZ = 6.6347 mm, and the positive refractive power of the lens power: D = 15.00 diopter. (High plus). In addition, the thickness dimension on the lens central axis 14 is T _C = 0.32 mm, and the thickness dimension of the front junction 32 is T _FJ = 0.147 mm. Furthermore, the rear surface peripheral portion 28 of the peripheral portion has an arc shape with a radius of curvature: r _BPZ = 8.6231 mm.

Under these conditions, the following formula is applied to a contact lens having a positive refractive power of D _FOZ <7 mm:
1.238 ≦ T _BJ / T _FJ ≦ 1.470
The ratio of the thickness dimensions of the back junction 30 and the front junction 32 is determined so that the value of T _BJ / _TFJ is 1.30 so that the condition of Set the shape. In this embodiment, in addition to passing the point of the thickness dimension of the back junction 30: T _BJ = 0.191 mm, the inner and outer peripheral edges of the peripheral portion are located at the outer peripheral edge of the optical portion and the inner peripheral edge of the edge. The cross-sectional shape of the front peripheral portion 26 in the peripheral portion is determined on the condition that the inner peripheral portion of the front peripheral portion 26 is connected to the outer peripheral portion of the front optical portion 19 with a common tangent line. The third order polynomial is set such that the distance from the lens center axis 14 is x. A polynomial representing the shape of the front peripheral portion 26 determined in this way is shown below.

f (x) = ax ³ + bx ² + cx + d
However, a = −2.887313 × 10 ⁻²
b = 3.08024 × 10 ⁻¹
c = -1.57935
d = 1.07446 × 10

  The contact lens having such a shape satisfies the conditions of the present invention, and can exhibit excellent handling properties such as ease of determination of the front and back, together with excellent wearing feeling. It has been confirmed.

Next, in the contact lens of Example 7 shown in FIG. 12, the optical section outer diameter dimension D _{FOZ on the} front surface of the lens is larger than that of Example 6 and D _FOZ = 8 mm in the longitudinal section. The rear optical part 18 of the optical part has an arc shape with a radius of curvature: r _BOZ = 8.40 mm, and the front optical part 19 has an arc shape with a radius of curvature: r _FOZ = 6.6868 mm. Lens power: D = 15.00 Diopter positive refractive power (high plus). The thickness dimension on the lens central axis 14 is T _C = 0.49 mm, and the thickness dimension of the front junction 32 is T _FJ = 0.155 mm. Furthermore, the rear surface peripheral portion 28 of the peripheral portion has an arc shape with a radius of curvature: r _BPZ = 8.6231 mm.

Under such conditions, the back junction 30 and the front junction 32 are satisfied so as to satisfy the conditions of the upper and lower limit evaluation lines shown in FIG. 5 applied to a contact lens having a positive refractive power of D _FOZ ≧ 7 mm. The ratio of each thickness dimension: The condition was determined so that the value of T _BJ / _TFJ was 0.90, and the shape of the front peripheral portion 26 in the peripheral portion was set. In this embodiment, in addition to passing the point of the thickness dimension of the back junction 30: T _BJ = 0.139 mm, the inner and outer peripheral edges of the peripheral portion are located at the outer peripheral edge of the optical portion and the inner peripheral edge of the edge. The cross-sectional shape of the front peripheral portion 26 in the peripheral portion is determined on the condition that the inner peripheral portion of the front peripheral portion 26 is connected to the outer peripheral portion of the front optical portion 19 with a common tangent line. The third order polynomial is set such that the distance from the lens center axis 14 is x. A polynomial representing the shape of the front peripheral portion 26 determined in this way is shown below.

f (x) = ax ³ + bx ² + cx + d
However, a = −5.35862 × 10 ⁻²
b = 7.59929 × 10 ⁻¹
c = -4.25377
d = 1.58474 × 10

  The contact lens having such a shape satisfies the conditions of the present invention, and can exhibit excellent handling properties such as ease of determination of the front and back, together with excellent wearing feeling. It has been confirmed.

As is clear from the lens shape of the optical part in the plus-power contact lens shown in Examples 6 and 7, in general, in the plus lens, the connection between the optical part and the peripheral part on the lens front surface rather than on the lens central axis. The lens thickness is greater at the site. Therefore, the lens center axis on the lens thickness: T there is no problem to set a relatively large _C, also the lens center axis on the lens thickness: maximum from T _C, the optical portion and the peripheral of the lens front surface For example, it is effective to design the lens thickness: T _C on the lens central axis so as to satisfy the condition of 0.05 mm ≦ T _C. is there.

It is a longitudinal cross-sectional explanatory drawing of the radial direction which shows the outline of the contact lens as one Embodiment of this invention. FIG. 2 is a front view of the contact lens shown in FIG. 1. 1 is a graph showing statistically the results of monitor evaluation of a plurality of types of contact lenses having the structure shown in FIG. 1 and having a lens power of the optical part: P = “− 10 diopter ≦ P ≦ 0 diopter”. It is. FIG. 3 is a graph statistically showing the result of monitor evaluation for a plurality of types of contact lenses having the structure shown in FIG. 1 and having a lens power P: “P <−10 diopter”. 2 is a graph showing statistically the results of monitor evaluation of a plurality of types of contact lenses having the structure shown in FIG. 1 and having a lens power P of “0 <P”. It is a longitudinal cross-sectional view of the radial direction which shows the contact lens as Example 1 of this invention. It is a longitudinal cross-sectional view of the radial direction which shows the contact lens as Example 2 of this invention. It is a longitudinal cross-sectional view of the radial direction which shows the contact lens as Example 3 of this invention. It is a longitudinal cross-sectional view of the radial direction which shows the contact lens as Example 4 of this invention. It is a longitudinal cross-sectional view of the radial direction which shows the contact lens as Example 5 of this invention. It is a longitudinal cross-sectional view of the radial direction which shows the contact lens as Example 6 of this invention. It is a longitudinal cross-sectional view of the radial direction which shows the contact lens as Example 7 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Contact lens 14 Lens center axis | shaft 18 Back surface optical part 19 Front surface optical part 26 Front surface peripheral part 28 Back surface peripheral part 30 Back junction 32 Front junction

Claims (12)

  In the contact lens provided with an optical part in the center part of the lens and a peripheral part on the outer peripheral side of the optical part, and worn on the surface of the cornea as a whole,
  The lens power of the optical part: P is set to −6 diopter ≦ P ≦ 0 diopter,
  While the optical portion and the peripheral portion of the lens front surface are positioned more outwardly in the lens radial direction perpendicular to the lens central axis than the optical portion and the peripheral portion of the lens front surface.
  The lens thickness on the lens center axis is 0.03 to 0.50 mm,
  The lens thickness of the connecting portion between the optical part and the peripheral part on the front surface of the lens is equal to or greater than the lens thickness on the lens central axis, and
  Lens thickness of the connecting portion between the optical part and the peripheral part on the rear surface of the lens: T _BJ Is the lens thickness at the connecting portion between the optical part and the peripheral part on the front surface of the lens: T _FJ It is said that
A contact lens characterized by that.   In the connection portion between the peripheral portion and the edge provided at the outer peripheral edge portion of the lens,
  The connecting portion between the peripheral portion and the edge on the front surface of the lens and the connecting portion between the peripheral portion and the edge on the rear surface of the lens are positioned outward in the lens radial direction perpendicular to the lens central axis,
  The connection part between the peripheral part and the edge on the front surface of the lens and the lens thickness of the connection part between the peripheral part and the edge on the rear surface of the lens are both connected to the optical part and the peripheral part on the rear surface of the lens. Lens thickness: T _BJ The contact lens according to claim 1, wherein the contact lens is made smaller. A contact lens periphery is worn superimposed on the surface of the cornea as a whole is provided on the lens central portion with an optical unit is provided on the outer peripheral side of the optical faculties, different lens power against light Faculty : A series of contact lenses with a combination of multiple types with P set.
In the contact lens in which the lens power of the optical part: P is set in a range of “−10 diopter ≦ P ≦ 0 diopter”, the optical power at the rear surface of the lens is more than the connection part of the optical part and the peripheral part at the front surface of the lens. while connecting portion parts and the peripheral portion is brought located outside a lens radial direction perpendicular to the lens center axis, together with the lens thickness on the lens center axis is a 0.03~0.50mm , optical undergraduate and lens thickness of the connection portion of the peripheral portion of the lens front: T _FJ are as above 0.05 mm, and the lens of the connection portion of the optical undergraduate and the peripheral portion of the lens rear surface thickness: T _BJ is the following formula depending on the lens power of the optical unit: P:
Σ (A _i · 10 ⁻ⁱ · P ⁱ ) ≦ T _BJ / T _FJ ≦ Σ (B _i · 10 ⁻ⁱ · P ⁱ )
A ₀ = + 1.2382
A ₁ = −0.1741
A ₂ = −1.4711
A ₃ = −0.9355
B ₀ = + 1.4699
B ₁ = −0.2523
B ₂ = -1.9897
B ₃ = −1.2603
A series of contact lenses characterized in that they are dimensioned according to A contact lens periphery is worn superimposed on the surface of the cornea as a whole is provided on the lens central portion with an optical unit is provided on the outer peripheral side of the optical faculties, different lens power against light Faculty : A series of contact lenses with a combination of multiple types with P set.
The optical portion of the lens power: P is in the contact lens which is set in the range of "-6 diopters ≦ P ≦ 0 diopters", lens thickness on the lens center axis is a 0.03~0.50mm In addition, the lens thickness of the connecting portion between the optical portion and the peripheral portion on the front surface of the lens: _TFJ is 0.05 mm or more, while the rear surface of the lens is more than the connecting portion between the optical portion and the peripheral portion on the front surface of the lens. optical undergraduate and lens thickness of the connection portion of the optical undergraduate and the peripheral portion of the connecting portion of the periphery has been brought located outside a lens radial direction perpendicular to the lens center axis, and such lens rear surface in : T _BJ is the following formula:
T _BJ / T _FJ ≧ 1
A series of contact lenses characterized by the thickness dimensions according to In the contact lens, together with the in front of the lens optical portion and diameter of the connection portion of the peripheral portion is a 55 to 85% of the lens outside diameter, connected portions of optical undergraduate and the peripheral portion of the lens rear surface The series of contact lenses according to claim 3 or 4 , wherein a diameter dimension of said lens is 70 to 90% of a lens outer diameter dimension. A contact lens periphery is worn superimposed on the surface of the cornea as a whole is provided on the lens central portion with an optical unit is provided on the outer peripheral side of the optical faculties, different lens power against light Faculty : A series of contact lenses with a combination of multiple types with P set.
In the contact lens in which the lens power of the optical unit: P is set in a range of “P <−10 diopter”, the optical unit on the rear surface of the lens and the optical unit on the rear surface of the contact portion of the optical unit on the lens front surface and while being brought located outside a lens radial direction perpendicular to connecting portion of the peripheral portion to the lens center axis, together with the lens thickness on the lens center axis is a 0.03～0.50Mm, lens front optical undergraduate and the peripheral portion of the lens thickness of the connection sites in: T _FJ are the least 0.05mm and and optical undergraduate and lens connection part of the peripheral portion of the lens rear surface thickness: T _BJ is Depending on the lens power of the optical part: P, the following formula:
(1) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ <7.0 mm”
0.877 ≦ T _BJ / T _FJ ≦ 0.993
(2) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ ≧ 7.0 mm”
Σ (A _i · 10 ⁻ⁱ · P ⁱ ) ≦ T _BJ / T _FJ ≦ Σ (B _i · 10 ⁻ⁱ · P ⁱ )
A ₀ = + 1.7980
A ₁ = + 1.4330
A ₂ = + 0.5824
A ₃ = + 0.0814
B ₀ = + 2.0184
B ₁ = + 1.5827
B ₂ = + 0.6298
B ₃ = + 0.0871
A series of contact lenses characterized by the thickness dimensions according to With an optical unit is provided on the lens central portion, a contact lens periphery is worn superimposed on the surface of the cornea as a whole is provided on the outer peripheral side of the optical faculties, different lens relative optical Faculty Frequency: A series of contact lenses with a combination of multiple types with P set.
In the contact lens in which the lens power of the optical part: P is set in the range of “0 diopter <P”, the optical part and the periphery on the rear surface of the lens rather than the connection part of the optical part and the peripheral part on the front surface of the lens while being allowed positioned outside the part of the connection sites lens radial direction perpendicular to the lens center axis, together with the lens thickness on the lens center axis is a 0.03～0.50Mm, in the lens front surface optical undergraduate and lens thickness of the connection portion of the periphery: T _FJ are as above 0.05 mm, and the lens of the connection portion of the optical undergraduate and the peripheral portion of the lens rear surface thickness: T _BJ is the Depending on the lens power of the optical part: P, the following formula:
(1) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ <7.0 mm”
1.238 ≦ T _BJ / T _FJ ≦ 1.470
(2) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ ≧ 7.0 mm”
Σ (A _i · 10 ⁻ⁱ · P ⁱ ) ≦ T _BJ / T _FJ ≦ Σ (B _i · 10 ⁻ⁱ · P ⁱ )
A ₀ = + 1.2066
A ₁ = −0.0398
A ₂ = −0.1341
A ₃ = + 0.0139
B ₀ = + 1.4328
B ₁ = −0.0516
B ₂ = −0.1436
B ₃ = + 0.0153
A series of contact lenses characterized by the thickness dimensions according to In the contact lens, at least one of the lens front surface and the lens rear surface is connected with a common tangent to each end of the optical portion and the peripheral portion in a radial section, and each end of the optical portion and the peripheral portion. over the interval between sets and connecting surface is formed to have a smooth continuous surface shape inclination angle of the tangent varies continuously, the claims connection portion of the optical portion and the peripheral portion by the connecting surface is formed The contact lens series according to any one of 3 to 7 . In the contact lens, the peripheral portion of the lens front surface, second or higher polynomial, any one of the conic and billing there is a radial cross-sectional shape defined by at least one spline curve section 3-8 Contact lens series as described in. The contact lens series according to any one of claims 3 to 9 , wherein in the contact lens, at least a part of the peripheral portion has an arc shape in a radial cross section of the rear surface of the lens. The contact lens series according to any one of claims 3 to 10 , wherein the contact lens is a soft contact lens made of a soft material. When the optical unit is provided on the lens central portion and peripheral portion is provided on the outer peripheral side of the optical unit in co, a contact lens to be worn superimposed on the surface of the cornea as a whole, light Faculty of lenses power: the (i) hereinafter identified by P, (ii), a contact lens which is characterized in that it has a shape in accordance with any one of the conditions (iii).
(I) lens power: connection P are as "-10 diopters ≦ P ≦ 0 diopter", the optical undergraduate and the peripheral portion of the lens rear surface than the connecting portion of the peripheral portion and the optical portion of the lens front surface while the site is brought located outside a lens radial direction perpendicular to the lens center axis, together with the lens thickness on the lens center axis is a 0.03～0.50Mm, optical faculties in the lens front surface a lens thickness of the connection portion of the periphery: T _FJ are as above 0.05 mm, and the lens of the connection portion of the optical undergraduate and the peripheral portion of the lens rear surface thickness: T _B is light Faculty Depending on the lens power: P, the following formula:
Σ (A _i · 10 ⁻ⁱ · P ⁱ ) ≦ T _BJ / T _FJ ≦ Σ (B _i · 10 ⁻ⁱ · P ⁱ )
A ₀ = + 1.2382
A ₁ = −0.1741
A ₂ = −1.4711
A ₃ = −0.9355
B ₀ = + 1.4699
B ₁ = −0.2523
B ₂ = -1.9897
B ₃ = −1.2603
According to the thickness dimension .
(Ii) lens power: P are as "P <-10 diopters" optical undergraduate and connecting portion of the periphery lens in the lens rear surface than the connecting portion of the peripheral portion and the optical portion of the lens front surface while a lens radial direction perpendicular to the central axis are brought positioned outside, together with the lens thickness on the lens center axis is a 0.03～0.50Mm, optical undergraduate and the peripheral of the lens front surface Thickness: T _FJ is 0.05 mm or more at the connection portion of the portion, and the lens thickness: T _BJ of the connection portion between the optical portion and the peripheral portion on the rear surface of the lens is the lens power of the optical portion: Depending on P:
(1) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ <7.0 mm”
0.877 ≦ T _BJ / T _FJ ≦ 0.993
(2) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ ≧ 7.0 mm”
Σ (A _i · 10 ⁻ⁱ · P ⁱ ) ≦ T _BJ / T _FJ ≦ Σ (B _i · 10 ⁻ⁱ · P ⁱ )
A ₀ = + 1.7980
A ₁ = + 1.4330
A ₂ = + 0.5824
A ₃ = + 0.0814
B ₀ = + 2.0184
B ₁ = + 1.5827
B ₂ = + 0.6298
B ₃ = + 0.0871
According to the thickness dimension .
(Iii) lens power: P are as "P <-10 diopters" optical undergraduate and connecting portion of the periphery lens in the lens rear surface than the connecting portion of the peripheral portion and the optical portion of the lens front surface while a lens radial direction perpendicular to the central axis are brought positioned outside, together with the lens thickness on the lens center axis is a 0.03～0.50Mm, optical undergraduate and the peripheral of the lens front surface Thickness: T _FJ is 0.05 mm or more at the connection portion of the portion, and the lens thickness: T _BJ of the connection portion between the optical portion and the peripheral portion on the rear surface of the lens is the lens power of the optical portion: Depending on P:
(1) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ <7.0 mm”
_{1.238 ≦ T BJ / T FJ ≦} 1.470
(2) Diameter dimension of the optical part in front of the lens: D _FOZ is “when D _FOZ ≧ 7.0 mm”
Σ (A _i · 10 ⁻ⁱ · P ⁱ ) ≦ T _BJ / T _FJ ≦ Σ (B _i · 10 ⁻ⁱ · P ⁱ )
A ₀ = + 1.2066
A ₁ = −0.0398
A ₂ = −0.1341
A ₃ = + 0.0139
B ₀ = + 1.4328
B ₁ = −0.0516
B ₂ = −0.1436
B ₃ = + 0.0153
According to the thickness dimension .

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