WO2006101184A1

WO2006101184A1 - Glasses lens

Info

Publication number: WO2006101184A1
Application number: PCT/JP2006/305890
Authority: WO
Inventors: Masanobu Urabe; Fumio Takahashi
Original assignee: Nikon-Essilor Co., Ltd.
Priority date: 2005-03-22
Filing date: 2006-03-17
Publication date: 2006-09-28
Also published as: JP2008089618A

Abstract

A glasses lens which can be used not only as a vision correcting tool but positively as tension easing auxiliary tool at near vision. The glasses lens (1) is for normal vision or vision correction, with a tension easing area, for reducing a regulating power at near vision to ease the tensed condition of an eye, being formed in a near vision area used for near viewing. The tension easing area is formed well below a distant vision area used for distance viewing via a 8 mm-18 mm power transition area (19).

Description

Technical book Eyeglass lens Technical field

The present invention relates to a spectacle lens, and more particularly to relief of eye tension in a spectacle lens for normal vision or vision correction. Background art

1 9 7 Progressive focus lens developed in 2 years has undergone many design improvements, and as a spectacle lens for the senior generation that compensates for adjustments according to applications such as far, middle, near and near. Demand is increasing. Ability to know that the decline in accommodation is progressing from a fairly young age Generally, for younger age than the presbyopia generation starting around 40 years old, normal vision, hyperopia, astigmatism correction, etc. At present, the function of the lens is sufficient.

However, reflecting the recent IT era, there are many opportunities to increase the stress applied to the eye's accommodation functions, and as a negative effect, symptoms such as stiff shoulders and neck are increasing in addition to eye fatigue. This phenomenon does not require correction of visual acuity (that is, it does not necessarily require an ophthalmic lens) and may occur even for a normal sighted person. Except for students and PC users who continue to have eye tension for a long time. Absent. As a result, in addition to these subjective symptoms, actual harm such as false myopia also occurs. Disclosure of the invention

The present invention has been made in view of the above-described problems, and provides a spectacle lens that can be actively used not only as a vision correction tool but also as a strain relief assisting tool in near vision. Objective. In order to solve the above-mentioned problems, the present invention is a spectacle lens for normal vision or vision correction, in a near vision region corresponding to a near view, by reducing the adjustment power at the near vision and reducing the eye. There is provided a spectacle lens characterized in that a strain relief region for relieving the tension state is formed.

According to a preferred aspect of the present invention, the strain relief region is formed through a frequency transition region of 8 mm to l 8 mm downward from a far vision region corresponding to a distant view. In addition, it is preferable that the frequency of the strain relief region is set to a plus frequency side with respect to the far frequency by a predetermined frequency within a range of 0.5 diopter to 1.2 5 diopter. The predetermined power is preferably set without depending on the magnitude of the remote power. The strain relief region is preferably formed on at least one of a front surface and a rear surface of a semi-finished blank for a single focus lens. Further, in the far vision region above the horizontal line passing through the distance eye point and having a radius within 30 mm with the distance eye point as the center, astigmatism based on performance evaluation assuming wearing condition is 0.5. It is preferably within 0 diopter.

In the spectacle lens of the present invention, a tension relief (stress-relief) region is formed in the near vision region corresponding to the near view, and the adjustment force for near vision is reduced by the action of the strain relief region, and as a result Relieve tension. As a result, the spectacle lens of the present invention can be actively used not only as a vision correction tool but also as a tension relief aid for near vision. Brief Description of Drawings

FIG. 1 is a diagram schematically showing a configuration of a spectacle lens according to a first embodiment of the present invention.

FIG. 2 is a diagram schematically showing a configuration of a spectacle lens according to a second embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram schematically showing a configuration of a spectacle lens according to a first embodiment of the present invention. In the first embodiment, the present invention is applied to a normal single-focus spectacle lens. As shown in FIG. 1, the eyeglass lens 1 of the first embodiment includes a lens front surface 1a formed in a spherical shape or an aspheric shape having an optical center O as a symmetry axis, and a strain relief region as described later. And a formed lens rear surface 1b.

In general, in the case of a single-focus lens, the distance eye point indicated by the cross mark in the figure (also called the fitting point) 1 1 coincides with the optical center 〇, and the distance eye point 1 1 horizontal line (Indicated by the broken line in the figure) 1 Above 2 corresponds to a distant view

(Distant line of sight passes) It becomes a far vision area. In the far vision region, a circle adjacent to the distance eye point 1 1 (shown by a broken line in the figure) 1 3 is a measurement reference circle for the distance power (far power).

On the other hand, a pair of small circles 14 and 15 that are horizontally spaced directly below the horizontal line 12 with the distance eye point 11 between them are horizontal reference marks (permanent marks). In addition, the circle 16 spaced downward from the distance eye point 1 1 measures the power of the near vision area corresponding to the near view (the near line of sight passes), that is, the power of the near vision (near power). Reference circle.

A frequency transition region (intermediate progressive zone) exists between the far vision region above the horizontal line 12 and the near vision region centered on the measurement circle 16 for near vision power. Curves 17 and 18 drawn by broken lines are examples of the present invention showing contour lines having astigmatism (astigmatism difference) of 0.5 diopter, that is, a 0.5 D frequency curve.

In the first embodiment, for example, by using a semi-finished 'Planck material for a single focus lens, the power in the near reference power measurement circle 16, that is, the near power, is the power in the distance power measurement reference circle 13, that is, Regardless of the distance power, For example, the rear surface 1b of the spectacle lens 1 is processed so that the power is a positive power with respect to the far power by a predetermined power within a range of 0.5 diopter to 1.2 diopter.

As described above, in the spectacle lens 1 of the first embodiment, for example, a tension relaxation region having a frequency on the plus side of the distance power by a frequency of about 0.5 diopter to about 1.25 diopter is set to the near vision region. Since it is formed, the tension-relief region acts to reduce the adjustment required for near vision and, in turn, to relieve eye tension. That is, the spectacle lens 1 of the first embodiment can be actively used not only as a vision correction tool but also as a tension relief aid for near vision. In the above description, for example, the rear surface of a semi-finished blank material for a single focus lens is processed. In the case of astigmatism prescription, the progressive surface for the strain relief region and the astigmatism surface may be fused on the rear surface, however, the progressive surface for the strain relief region on the front of the spectacle lens for orthosight or vision correction And an astigmatism surface may be provided on the rear surface. Alternatively, the strain relief region can be formed in the near vision region by processing both the front surface and the rear surface of the spectacle lens for normal vision or vision correction. The semi-finished blank material for a single focus lens is a semi-finished blank material conventionally used for a single focus lens.

FIG. 2 is a diagram schematically showing a configuration of a spectacle lens according to a second embodiment of the present invention. The second embodiment is similar to the first embodiment, but differs from the first embodiment in that the present invention is applied to a polarizing spectacle lens. Therefore, in FIG. 2, the same reference numerals as those in FIG. 1 are assigned to the same elements as those in FIG. Hereinafter, the second embodiment will be described by paying attention to differences from the first embodiment.

In the polarizing spectacle lens 2 of the second embodiment, since the polarizing filter 21 is embedded in the vicinity of the lens front surface 2a or bonded to the front surface 2a, the front surface 2a is processed to realize near vision. It is not possible to provide a progressive surface for the tension relief area in the area. Is possible. Therefore, the front surface 2a is formed in a spherical shape or an aspherical shape with the optical center O as the symmetry axis, and only the rear surface 2b of the lens is processed to provide a progressive surface for the strain relief region in the near vision region. (In other words, a strain relief function is added to the near vision area).

In the examples of Fig. 1 and Fig. 2, the distance eye point and the center of the distance power measurement reference circle are drawn at positions spaced apart from each other. However, depending on the design policy of the lens, this can be matched. Needless to say. In that case, it will be matched with the horizontal reference line which is a straight line connecting two horizontal reference marks. In this way, by aligning the center of the distance eye point and distance distance measurement reference circle with the horizontal reference line, the eyeglass lens of the present invention can be handled in the same way as a single focus lens. I can expect.

In the spectacle lens of the present invention, the distance from the distance eye point (in the case of a single focus lens, generally coincides with the optical center of the lens) to the position where the predetermined additional refractive power is reached, that is, the frequency transition region 1 9 (see Figure 1 and Figure 2) is 8 mm to 18 mm (more preferably 8 mm to 15 mm) long (corresponding to the progressive zone length of the progressive refraction calendar) It is desirable to design the lens with as little lens aberration as possible in half the distance vision area. In other words, the strain relief region is formed downward from the distance vision region via a power transition region 19 mm of 8 mm to l 8 mm (more preferably via a power transition region of 8 mm to 15 mm). Is desirable.

In general, a progressive lens has a refractive power that changes in the vertical direction of the lens, unlike a single-focus lens in which the entire lens surface has a constant refractive power. For this reason, in distance vision, the line of sight is directed upward and near the distance point, and in near vision, the line of sight is directed downward and near the distance object. If the distance between them, that is, the length of the progressive zone, becomes longer, the line of sight must be greatly swung. When using with the eyes facing downward, eyeglass lenses with eye movements exceeding the width of the eye can be used for a short time, but long-term use becomes difficult. In this sense, the shorter progressive zone is easier to use It turns out that.

On the other hand, if the progressive zone length of the progressive lens is shortened to a certain level or more, large astigmatism will occur at the side of the progressive zone, so it is advisable to make the progressive zone extremely short in terms of aberrations. is not.

However, in the spectacle lens of the present invention, the added power is kept small and the power gradient is gentle. Therefore, the length of the power transition region may be a small value within the range of the distance. In this sense, the spectacle lens of the present invention can be said to be a spectacle lens with good usability.

In order to select a lens that matches the purpose of use of the wearer, a single-focus lens with the most product lineup on the market is the best. In addition to various surface treatments such as various anti-reflective coatings, water and oil repellency, dyeing, polarization and special color filter bonding, as well as various lens materials ranging from high refractive index to low refractive index, The design of the front surface of the lens, such as a spherical design or an aspherical design, can also be selected as a product type. Since the product price of the lens reflects these functions, it is possible to select from inexpensive to expensive. By adding a strain relief function to the rear surface of the semi-finished blank material with many types of single focus lenses, it is convenient to select a lens according to the purpose, preference, budget, etc. It is.

The spectacle lens of the present invention having a tension relieving function, for example, reduces the adjustment power necessary for near vision even by a plus refractive power added to the near vision region of a single focus lens, and thus It is intended to reduce eye fatigue. In particular, it is a useful lens for those in their 40s who can be said to be a reserve arm of presbyopic glasses that are presbyopic. The spectacle lens of the present invention is similar in form to a progressive-power lens for presbyopia (also referred to as a progressive focus lens), but differs in the following points.

First, in the spectacle lens of the present invention, unlike the progressive addition lens, there is no idea of preparing various types of addition depending on the adjustment power of the wearer. For example, it is a constant value within the range of 0.5 Diop evening to 1.2 Diop evening. In addition, the wearing target of the spectacle lens of the present invention is an age group from young people in their 20s to the late 40s of early presbyopic symptoms. The stratum is not the target. Furthermore, the eyeglass lens of the present invention is intended to meet the diverse needs of users by adding a strain relief function to the rear surface of the semi-finished blank material for single focus lenses, which has many varieties. It is said. In addition, as described above, it is possible to deal with various lenses in which a filter is attached to the front surface of the lens like a polarizing lens. In the astigmatism prescription, it is possible to fuse the progressive surface for the strain relief region and the toroidal surface on the rear surface of the lens, but it is also possible to add a strain relief function to the front if there are restrictions on the processing of the rear surface Is done.

Since the spectacle lens of the present invention having a tension relieving function is intended for the generation in which some adjustment power remains, the existence of a progressive zone is not important, so that it is not seen in presbyopia lenses in appearance. It is important to make it “no border”. It is necessary to form a progressive zone in order to add a positive frequency to the near vision region without a boundary, but when a progressive zone is formed, the side of the progressive zone is known as known as the Minkwitz law. Astigmatism occurs. This astigmatism reduces visual acuity and causes distortion and distortion of the image, so it is required to reduce it as much as possible. Progressive power lenses with various designs have been developed. In the spectacle lens of the present invention, it is particularly important that the astigmatism in the far vision region (distance region) in the upper half of the lens is as inconspicuous as possible. This is because it is a matter of course that the visual acuity value will be improved if a single-focus lens according to the prescription is worn, and a lens whose visual acuity is lowered by wearing the lens is generally not allowed. Therefore, it is important that the visual acuity of far vision is not lost as much as possible, and it is worn in the far vision region above the horizon passing through the distance eye point and having a radius of 30 mm or less around the distance eye point. It is desirable that astigmatism by performance evaluation assuming the state is suppressed to within 0.50 diopter (more preferably within 0.25 diopter). Therefore, when designing a strain relief region using a semi-finished blank for a single focus lens according to the prescription power ordered, an optimization design should be performed to optimize the lens performance at that prescription power. You can also choose to incorporate it. Although the manufacturing method with a base curve is reasonable, as described later, the maximum performance is not always secured at all frequencies within the production frequency range. Optimizing the lens surface design when setting is effective and useful.

In addition to the prescription power mentioned above, this optimization should cover various parameters such as spectacle frame shape, lens wearing distance, near vision distance, lens forward tilt angle, lens tilt angle, etc. it can. Above all, taking into consideration the shape of the wearer's spectacle frame, optimizing only this inner region results in fewer design constraints than optimizing with the lens reference outer diameter, so the aberration is further reduced. There is still a possibility of being able to do so, and a further improvement in performance can be expected.

In addition, it is possible for the user to reduce the transmittance so that only light rays that are kind to the eyes are transmitted by an appropriate amount by selectively transmitting the light rays in consideration of the spectroscopic characteristics of the spectacle lens depending on the purpose of use. It will be more comfortable and you can expect more relaxation. One example is intense UV and blue light

Prevent or reduce light with a wavelength shorter than 400 nm, or reduce the transmittance of only light in the wavelength range of 530 nm to 590 nm, which has the highest eye sensitivity. By combining the glare effect, it is possible to relieve the stimulation of the retina of the eye and relieve eye strain. In addition, since the lens material formed by the clear combination with rare earth elements such as neodymium has an anti-glare effect, the half-value width of 15 nm or more in spectral characteristics between 5 30 nm and 5 90 nm. It is desirable to use a lens material that reduces the transmittance by 15% or more in width. In addition, it can be expected to have a tension-relieving effect when coloring purple lenses that give comfort.

The eyeglass lens of the present invention has a permanent mark or temporary paint mark on the front or rear surface. It is desirable to add a mark. As shown in Fig. 1 and Fig. 2, horizontal reference marks 14 and 15 as permanent marks for lens alignment are placed horizontally and horizontally on the front or rear surface of the lens with the lens design center in between. It can be attached at a position of about 17 mm. In addition, a pre-set strain relief function mark and a horizontal alignment mark may be processed as permanent marks on the front or rear surface of the lens so that the eyeglass lens has a strain relief function. In order to indicate the horizontal reference mark position, it is generally possible to place temporary paint marks at two locations along the horizontal direction on the same side as the permanent mark for alignment.

By the way, in the case of a progressive power lens, a semi-finished blank material consisting of several (3-5) base curves is generally prepared and the rear surface is processed, so that the semi-finished blank material with the same base curve is used. The frequency range for using is wide. In this case, in general, the lens is designed so that the power at the center of this power range is the best in terms of performance, and therefore, the lens yield tends to increase with distance from the design power. From this point of view, single-focus lenses have more base curves than multifocal lenses or progressive-power lenses, so the frequency range of a single base curve semi-finished blank must be narrowed. Therefore, it is possible to supply products with excellent performance over a wide frequency range by adding a strain relief function to the rear surface of the semi-finished blank for single focus lenses.

Claims

The scope of the claims

1. Eyeglass lenses for normal vision or vision correction,

An eyeglass lens characterized in that a near-field region corresponding to a near view is formed with a strain relief region for reducing the tension of the eye by reducing the adjustment power when viewing near.

2. The eyeglass lens according to claim 1, wherein the strain relief region is formed through a power transition region of 8 mm to 18 mm downward from a far vision region corresponding to a distant view.

3. The frequency of the strain relief region is set to a plus power side with respect to a far power by a predetermined power within a range of 0.5 diopter to 1.2 5 diopter. The spectacle lens described.

4. The spectacle lens according to claim 3, wherein the predetermined power is set without depending on the magnitude of the far power.

5. The spectacle lens according to claim 1, wherein the strain relief region is formed on at least one of a front surface and a rear surface of a semi-finished blank for a single focus lens.

6. The spectacle lens according to claim 3, wherein the strain relief region is formed on at least one of a front surface and a rear surface of a semi-finished blank for a single focus lens.

7. The spectacle lens according to claim 4, wherein the strain relief region is formed on at least one of a front surface and a rear surface of a semi-finished blank for a single focus lens.

8. In the far vision region above the horizontal line passing through the distance eye point and having a radius within 30 mm centering on the distance eye point, the astigmatism based on performance evaluation assuming wearing condition is 0.5. The spectacle lens according to claim 1 or 2, wherein the spectacle lens is within 0 diop.

9. In the far vision region above the horizontal line passing through the distance eye point and having a radius within 30 mm around the distance eye point, astigmatism based on performance evaluation assuming wearing condition is 0. The spectacle lens according to claim 3, wherein the spectacle lens is within 50 diopter.

In the far vision region above the horizontal line passing through the distance eye point and having a radius within 30 mm centered on the distance eye point, astigmatism by the performance evaluation assuming the wearing state is 0. 5. The spectacle lens according to claim 4, wherein the spectacle lens is within 50 diopters.

1 1.In the far vision region above the horizontal line passing through the distance eye point and having a radius within 30 mm around the distance eye point, the astigmatism based on the performance evaluation assuming the wearing state is 0. The spectacle lens according to claim 5, wherein the spectacle lens is within 50 diopter.

1 2. In a far vision area above the horizon passing through the distance eye point and having a radius within 30 mm centered on the distance eye point, performance evaluation assuming wearing condition is performed. The spectacle lens according to claim 6, wherein the astigmatism due to the astigmatism is within 0.50 diopter.

13. In the far vision region above the horizon passing through the distance eye point and having a radius within 30mm around the distance eye point, astigmatism based on performance evaluation assuming wearing condition is 0.50 diopter. The spectacle lens according to claim 7, wherein the spectacle lens is within one.