Trial lens, trial lens set, and trial lens set program

Abstract

According to the present invention, provided is a trial lens to be used by being set in a trial frame, wherein: an optical surface of the trial lens has a base part having a refractive power equivalent to that of the center point of the optical surface or having a refractive power that gently changes from the center point, and a plurality of segment parts having an optical function different from that of the base part; and in plan view, when the maximum diameter of a perfect circle in a range consisting only of the base part and including the center point of the optical surface is defined as a clear region diameter, at least one of the following (a) to (e) is held as visually, optically, or electrically readable information. (a) Information about clear region diameter, (b) information about corneal vertex distance during the trial, (c) information about trial frame, (d) information about set position of trial frame, and (e) numbers or symbols associated with at least one of (a)-(d)

Description

Trial Lens, Optometry Lens Set, and Program for Optometry Lens Set

[0001] The present invention relates to a trial lens, an optometry lens set, and a program for an optometry lens set.

[0002] Spectacle lenses exhibiting a myopia progression inhibitory effect (myopia progression inhibitory lenses) and spectacle lenses exhibiting a hyperopia reduction effect (hyperopia reduction lenses) are known. Hereinafter, these lenses are also referred to as myopia progression inhibitory lenses and the like.

[0003] For example, Non-Patent Document 1 describes the following method as a test method for comparing the myopia progression inhibitory effect when a myopia progression inhibitory lens and a single-vision lens are used. A spectacle frame having a single-vision lens on the left eye and a myopia progression inhibitory lens on the right eye is worn, and the difference between the axial length / chroroid thickness after 1 hour of wearing and the axial length / chroroid thickness before wearing is defined as the amount of change over time. The difference in the amount of change over time between the left and right eyes is taken as the difference in the myopia progression inhibitory effect between the lenses worn on the left and right eyes, respectively.

[0004] Further, for example, Patent Document 1 describes a method for estimating a myopia progression inhibitory effect from a change over time in choroidal thickness when wearing a myopia progression inhibitory lens.

[0005] China Patent Application Publication No. 116744837

[0006] By Zeeshan Akhtar, Arthur Back, Padmaja Sankaridurg, Arthur Ho, Thomas Naduvilath, "Short-term effect of simultaneous negative and positive defocus on axial length, and choroidal thickness in the human myopic eye", published by The Association for Research in Vision and Ophthalmology (ARVO), issued in June 2024, iovs 2024 Abstract Issue Volume 65 Issue 7 (https: / / iovs.arvojournals.org / article.aspx?articleid=2795299)

[0007] One embodiment of the present invention aims to provide a trial lens, an optometric lens set, and a program for the optometric lens set that facilitate the evaluation of the effects of myopia progression suppression lenses and the like.

[0008] A first aspect of the present invention is a trial lens for use set in an eye examination frame, wherein the optical surface of the trial lens has a base portion having the same refractive power as the center point of the optical surface, or the refractive power changing smoothly from the center point, and a plurality of segment portions having different optical functions from the base portion, and in a plan view, when the maximum diameter of a perfect circle in the area including the center point of the optical surface and consisting only of the base portion is defined as the clear area diameter, at least one of the following (a) to (e) is held as visually, optically, or electrically readable information: (a) Information on the clear area diameter (b) Information on the corneal vertex distance at the time of eye examination (c) Information on the eye examination frame (d) Set position information of the eye examination frame (e) A number or symbol associated with at least one of (a) to (d) above

[0009] A second aspect of the present invention is an ophthalmic lens set including a plurality of trial lenses for use set in an ophthalmic frame, wherein the optical surface of the trial lens has a base portion having refractive power equivalent to that of the center point of the optical surface, or the refractive power changing smoothly from the center point, and a plurality of segment portions having different optical functions from the base portion, and in a plan view, when the maximum diameter of a perfect circle in the area including the center point of the optical surface and consisting only of the base portion is defined as the clear region diameter, at least one of the following (a) to (e) is held as visually, optically, or electrically readable information: (a) Information on the clear region diameter (b) Information on the corneal vertex distance at the time of eye examination (c) Information on the ophthalmic frame (d) Set position information of the ophthalmic frame (e) A number or symbol associated with at least one of (a) to (d) above

[0010] A third aspect of the present invention is the ophthalmic lens set according to the second aspect, comprising a pair of trial lenses having different clear area diameters.

[0011] A fourth aspect of the present invention is an ophthalmic lens set according to the second or third aspect, comprising a pair of trial lenses having a ratio of the clear area diameters of any of 1:1.67±0.08, 1:2.00±0.10, and 1:1.20±0.06.

[0012] A fifth aspect of the present invention is an ophthalmic lens set according to any one of the second to fourth aspects, comprising a pair of trial lenses having identical optical functions in the segment portion and different clear area diameters.

[0013] A sixth aspect of the present invention is an ophthalmic lens set according to any one of the second to fifth aspects, comprising a pair of trial lenses having the same optical function and clear area diameter in the segment portion.

[0014] A seventh aspect of the present invention is an ophthalmic lens set according to any one of the second to sixth aspects, which includes a trial lens in which the refractive power is 0D in the range that includes the center point of the optical surface and consists only of the base portion.

[0015] An eighth aspect of the present invention is an ophthalmic lens set according to any one of the second to seventh aspects, which includes a trial lens in which the area occupancy rate of the segment portion on the optical surface is 10% or more in a plan view.

[0016] A ninth aspect of the present invention is an ophthalmic lens set according to any one of the second to eighth aspects, which includes a trial lens having a thickness of 1 mm or more and having a mechanism such that when it is housed in the ophthalmic frame, the optical surface on which the segment portion is located faces a predetermined direction.

[0017] A tenth aspect of the present invention is an ophthalmic lens set according to any one of the second to ninth aspects, which includes a trial lens having a mechanism to prevent the lens from rotating around the optical axis when it is housed in the ophthalmic frame.

[0018] An eleventh aspect of the present invention is an ophthalmic lens set program used for an ophthalmic lens set including a plurality of trial lenses for use set in an ophthalmic frame, wherein the optical surface of the trial lens has a base portion having refractive power equivalent to that of the center point of the optical surface, or the refractive power changing smoothly from the center point, and a plurality of segment portions having different optical functions from the base portion, and the program includes a step of causing a computer to calculate the apparent clear area diameter for the wearer of the ophthalmic frame in which the trial lens is set, according to input information, when the maximum diameter of a perfect circle in a plan view that includes the center point of the optical surface and consists only of the base portion. The input information includes at least one of the following (a) to (e): (a) Information on the clear area diameter (b) Information on the corneal vertex distance at the time of eye examination (c) Information on the ophthalmic frame (d) Information on the set position of the ophthalmic frame (e) A number or symbol associated with at least one of (a) to (d) above

[0019] A twelfth aspect of the present invention is a program for an ophthalmic lens set according to the eleventh aspect, further comprising the step of causing a computer to calculate a trial lens suitable for the apparent clear area diameter to be a desired value, or the actual clear area diameter of the trial lens.

[0020] According to the present invention, it is possible to provide trial lenses, eye examination lens sets, and programs for eye examination lens sets that facilitate the evaluation of the effects of myopia progression suppression lenses and the like.

[0021] Figure 1 is a schematic plan view showing an example of a trial lens for use in an eye examination frame. Figure 2 is a schematic view of the trial lens and the like set in the eye examination frame. Figure 3 is a schematic plan view showing an example of a trial lens according to the first embodiment of the present invention. Figure 4 is an example of a flowchart of a program for setting eye examination lenses according to the first embodiment of the present invention. Figure 5 is a plan view of the area near the optical surface center point of a Series A trial lens according to an embodiment of the present invention. Figure 6 is a plan view of the area near the optical surface center point of a Series B trial lens according to an embodiment of the present invention.

[0022] <Inventor's Findings> In clinical research conducted by research institutions such as Non-Patent Document 1, it is possible to prepare eyeglasses with individual lenses for all subjects. Furthermore, depending on the purpose of the clinical research, it is also possible to gather only subjects with similar prescriptions and small astigmatism. On the other hand, when evaluating the effects of myopia progression suppression lenses, etc., in a small-scale eyeglass store, it is necessary to prepare lenses that can accommodate a wide range of prescriptions, but it is difficult to prepare eyeglasses of various designs for each user. For example, even just for eyeglasses with a combination of a single-vision lens in one eye and a myopia progression suppression lens in the other eye, a considerable number of types need to be prepared. It is also conceivable to compare the use of myopia progression suppression lenses with different designs in the right and left eyes, but in that case, an even larger number of types of eyeglasses would need to be prepared. Therefore, when evaluating the effects of myopia progression suppression lenses, etc., in an eyeglass store, it is more practical to use an eye examination frame that can accommodate lenses that suppress myopia progression, etc.

[0023] Since multiple lenses can be set in the eye examination frame, it is possible to prepare separately lenses that have a myopia progression suppression effect (hereinafter referred to as trial lenses) and lenses with prescribed powers (spherical power and astigmatism power), making it easy to realize various combinations. Figure 1 is a schematic plan view showing an example of a trial lens 1 for use set in the eye examination frame. As shown in Figure 1, one main surface of the trial lens 1 (hereinafter also referred to as the optical surface) has a base portion 10 (also referred to as the base region) which has the same refractive power as the center point of the optical surface, or (mainly for the purpose of adding to assist accommodation when viewing distance changes or for the purpose of thinning the lens) the refractive power changes smoothly from the center point, and multiple segment portions 20 (also referred to as non-base regions or defocus regions) which have different optical functions from the base portion 10. Here, we will explain the case where the base portion 10 is a plano (a surface that can be considered optically flat with a refractive power of 0D or within ±0.12D). The segment portion 20 is, for example, a minute protrusion having a refractive power different from the wearer's prescribed refractive power (also called the defocus power), and the segment portion 20 allows the trial lens 1 to exhibit effects such as myopia progression suppression. More specifically, the myopia progression suppression effect or hyperopia progression suppression effect is achieved by the light-gathering effect of the non-base region outside the retina and / or the contrast-reducing effect on the retina in the region where the segment portion 20 is located (also called the functional region). In this specification, in planar view, the clear region diameter D is defined as the maximum diameter of a perfect circle in the area that includes the center point of the optical surface and consists only of the base portion 10.

[0024] In this specification, the defocus degree may be any of the following, or equivalent: (1) The difference in transmitted refractive power between the base region and the non-base region under lens mounting or measurement system conditions. (2) The value obtained by multiplying the difference in curvature between the base region and the non-base region by the influence of refractive power and the influence of the angle of incidence. (3) An alternative value using the height of the non-base region relative to the base region (especially the boundary between the non-base region and the base region). (4) The deviation of the point where the optical indicators (MTF, spot intensity, etc.) are best for the light beam passing through the base region and the light beam passing through the non-base region, respectively. Furthermore, the defocus degree is not limited to the mean spherical power, but may also be treated as the power in a specific direction or the power in the direction of maximum or minimum.

[0025] Through the inventor's investigation, it was found that the following problems arise when setting a trial lens in an eye examination frame. Figure 2 is a schematic diagram of a case where a trial lens is set in an eye examination frame. The left side of Figure 2 shows the case where the trial lens 1 is set in the first set position 101, which is the closest to the wearer among the multiple set positions of the eye examination frame 100. In this case, it is conceivable that contact lenses or the like would be worn to obtain the prescription power. If contact lenses or the like are not worn, it is common to set a lens for the prescription power in the first set position 101, so the trial lens 1 is often set in a position other than the first set position 101. The right side of Figure 2 shows the case where the trial lens 1 is set in the third set position 103, which is the third closest to the wearer among the multiple set positions of the eye examination frame 100. Note that in the right side of Figure 2, lenses for the prescription power are set in the first set position 101 and the second set position 102. Here, in Figure 2, the distance from the wearer's corneal apex to the optical surface where the segment portion 20 of the trial lens is positioned (hereinafter also referred to as the corneal apex distance) changes between the left and right diagrams, which changes the apparent clear area diameter for the wearer. For example, if the corneal apex distance L1 is 12 mm when the trial lens 1 is set at the first set position 101, and the corneal apex distance L3 is 24 mm when the trial lens 1 is set at the third set position 103, the apparent clear area diameter will differ by a factor of two. If the apparent clear area diameter differs, the myopia progression suppression effect obtained will also differ, making accurate evaluation difficult. In the following, to avoid complexity, the corneal apex distance L1 when the trial lens 1 is set at the first set position 101 will also be referred to as the corneal apex distance L1 of the first set position 101.

[0026] The inventor conducted intensive research on the above-mentioned problem and found the following two solutions. The first solution is to change the diameter of the clear area depending on the set position where the trial lens is to be set. In the example shown in Figure 2, if the diameter of the clear area of ​​trial lens 1a set at the first set position 101 is D, then if the diameter of the clear area of ​​trial lens 1c set at the third set position 103 is enlarged to 2D, the apparent diameters of the clear areas of both become equal. Therefore, by preparing an optometric lens set that includes a pair of trial lenses with different clear area diameters, it becomes possible to adjust the apparent diameter of the clear area during optometric examination, making it easier to evaluate the effects of myopia progression suppression lenses, etc.

[0027] The second solution is to store at least one of the following (a) to (e) as visually, optically, or electrically readable information on the trial lens: (a) Information on the diameter of the clear area (b) Information on the corneal vertex distance at the time of eye examination (c) Information on the eye examination frame (d) Information on the set position of the eye examination frame (e) A number or symbol associated with at least one of the above (a) to (d). As described above, if the diameter of the clear area of ​​the trial lens 1a set at the first set position 101 is D, then if the diameter of the clear area of ​​the trial lens 1c set at the third set position 103 is enlarged to 2D, the apparent diameters of the clear areas of both will be equal. Therefore, it is desirable to easily obtain information related to the position where the trial lens 1 should be set during eye examination. It is also desirable to reduce the possibility of human error such as setting the wrong position. For example, tags can be attached to the lens frame of trial lens 1. The tag of trial lens 1a, which should be set in the first set position 101, can be marked with information indicating "for the first set position 101," and the tag of trial lens 1c, which should be set in the third set position 103, can be marked with information indicating "for the third set position 103." By preparing trial lenses that retain such information, human errors such as setting the trial lens in the wrong position can be prevented, and the effectiveness of myopia progression suppression lenses can be easily evaluated.

[0028] In this specification, the term "eye examination frame" includes not only eye examination frames in the narrow sense, but also lens holders and other components provided in automated eye examination systems such as phoropters. In other words, it includes devices that can simultaneously hold multiple lenses for the purpose of eye examination and measurement, and that are interchangeable and combinable. For example, this also includes cases where clip-on lenses, which are attached to the surface of eyeglasses, are used for eye examination purposes.

[0029] [Details of Embodiments of the Invention] Next, one embodiment of the present invention will be described below with reference to the drawings. However, the present invention is not limited to these examples and is intended to include all modifications within the meaning and scope equivalent to the claims as shown in the claims.

[0030] <First Embodiment of the Invention> (1) Trial Lens First, the trial lens of this embodiment will be described. Figure 3 is a schematic plan view showing an example of the trial lens 2 of this embodiment. As shown in Figure 3, the optical surface of the trial lens 2 of this embodiment has a base portion 10 and a plurality of segment portions 20. The outer periphery of the trial lens 2 also has a lens frame 30 and a tag 40.

[0031] The base portion 10 is a part that has the same refractive power as the center point of the optical surface, or a part whose refractive power changes smoothly from the center point. In this embodiment, the case in which the base portion 10 is planar (flat) will be described.

[0032] The segment portion 20 is a part that has different optical functions from the base portion 10, and the segment portion 20 enables the trial lens 2 to exhibit effects such as myopia progression suppression. In this embodiment, the case in which the segment portion 20 is a minute protrusion having a refractive power different from the wearer's prescribed refractive power will be described. As shown in Figure 3, the multiple segment portions 20 are arranged independently and discretely, for example, such that the center of each segment portion 20 is the vertex of an equilateral triangle. The surface shape and arrangement of the segment portions 20 are not particularly limited. It is preferable that the centers (or vertices) of each segment portion 20 are separated by 0.2 mm or more. In particular, if the segment portion 20 is spherical in shape, it is preferable that either or both of the following (i) and (ii) are satisfied: (i) The number of segment portions 20 is 12 or more, preferably 18 or more (ii) The number of segment portions 20 is 5000 or less Furthermore, if the segment portions 20 are arranged in a concentric circle pattern with respect to a point on the lens, it is preferable that either or both of the following (iii) and (iv) are satisfied. (iii) The number of segment sections 20 is 1 or more, preferably 2 or more. (iv) The number of segment sections 20 is 50 or less.

[0033] As shown in Figure 3, in a plan view, the clear area diameter D is defined as the maximum diameter of a perfect circle in the area that includes the center point of the optical surface and consists only of the base portion 10. It is preferable that the trial lens 2 has a minimum clear area diameter (for example, 2 mm or more). In this specification, "plan view" refers to the view from the normal to the center point of the optical surface of the trial lens 2 unless otherwise specified. The present invention is also effective when the configuration is adopted in a plan view from an arbitrary point on the lens, such as the normal to the point to be evaluated, instead of a plan view from the normal to the eye point.

[0034] The lens frame 30 is, for example, a metal frame that protects the trial lens 2. The lens frame 30 is attached, for example, to the outer circumference of the trial lens 2.

[0035] The tag 40 is, for example, a metal component attached to the lens frame 30. The tag 40 holds at least one of the following (a) to (e) as visually, optically, or electrically readable information: (a) Information on the diameter of the clear area (b) Information on the corneal vertex distance at the time of eye examination (c) Information on the eye examination frame (d) Information on the set position of the eye examination frame (e) A number or symbol associated with at least one of the above (a) to (d). This makes it easier to evaluate the effectiveness of myopia progression suppression lenses, etc. The above five types of information will be explained in detail below.

[0036] (a) Information on the clear area diameter includes not only information on the actual clear area diameter of the trial lens 2, but also information on the apparent clear area diameter. In this specification, the apparent clear area diameter is expressed as D × (L1 / Ln), where L1 is the corneal vertex distance when the trial lens is set in the first set position 101, which is the closest to the wearer among the multiple set positions of the eye examination frame 100, Ln is the corneal vertex distance during the actual eye examination, and D is the actual clear area diameter. Since the corneal vertex distance L1 of the first set position 101 is approximately equal to the corneal vertex distance of typical eyeglasses, the apparent clear area diameter can be said to be a value converted when the myopia progression suppression lens is used as eyeglasses. For example, suppose the tag 40 of the trial lens 2 holds information that "the actual clear area diameter is φ8.6 mm" and information that "the apparent clear area diameter when set in the third set position 103 is φ4.3 mm". By interpreting the above information, examiners performing eye examinations can understand the actual and apparent diameters of the clear area, enabling them to smoothly conduct eye examinations to evaluate the effectiveness of myopia progression control lenses and the like.

[0037] (b) Information on the corneal vertex distance during eye examination can be rephrased as information on the optimal corneal vertex distance when the lens is placed in the eye examination frame 100. For example, suppose the tag 40 of the trial lens 2 holds the information that "the optimal corneal vertex distance is 24 mm." By reading the above information, the examiner performing the eye examination can understand that they should set the trial lens 2 in a position where the corneal vertex distance is 24 mm (for example, the third set position 103), and can smoothly perform eye examinations to evaluate the effectiveness of myopia progression suppression lenses, etc.

[0038] (c) The information on the eye examination frame can be rephrased as information on the eye examination frame that is suitable for setting this trial lens 2. Depending on the product specifications, the corneal vertex distance may differ for each lens setting position in the eye examination frame. By reading the information on the suitable eye examination frame, the examiner performing the eye examination can understand which eye examination frame should be used, and will be able to perform eye examinations to evaluate the effectiveness of myopia progression suppression lenses, etc.

[0039] (d) The set position information of the eye examination frame can be rephrased as information regarding the optimal set position of the eye examination frame when setting the trial lens 2. For example, suppose the tag 40 of the trial lens 2 holds the information "for the third set position 103". By reading the above information, the examiner performing the eye examination can understand the set position in which the trial lens 2 should be set, and will be able to perform the eye examination to evaluate the effect of myopia progression suppression lenses, etc., smoothly.

[0040] (e) The number or symbol associated with at least one of (a) to (d) above can be rephrased as identification information for identifying the trial lens 2. Preferably, the specifications and database attached to the trial lens 2 contain the information (a) to (d) above in a manner corresponding to the identification information. The examiner performing the eye examination can read the identification information of the trial lens 2 and look up the specifications and database to obtain the information (a) to (d) above associated with the identification information. This makes it possible to smoothly perform eye examinations to evaluate the effects of myopia progression suppression lenses, etc.

[0041] The above-mentioned information being held as visually, optically, or electrically readable information means, for example, that the information is engraved on the tag 40, that a label is attached to the tag 40, that a two-dimensional code indicating the information is attached to the tag 40, or that an IC chip with recorded information is incorporated into the tag 40. The location where the information is held is not limited to the tag 40; for example, the information may be engraved on the optical surface of the trial lens 2 or the lens frame 30, or it may be held in other parts used integrally with the trial lens 2. Furthermore, the information may be held in the lens bag of the trial lens 2, the specifications accompanying the trial lens 2, a database, etc.

[0042] It is preferable that the trial lens 2 has a refractive power of 0D in the range that includes the center point of the optical surface and consists only of the base portion 10. For example, if the base portion 10 is Plano, this condition will be met. In this case, by using the trial lens 2 in combination with an ophthalmic lens for prescription power (a lens that does not have a segment portion 20 and has a prescribed prescription), it becomes easy to accommodate users with a wide range of prescription powers. Note that known ophthalmic lenses for prescription power can be used. Furthermore, in this specification, a refractive power of 0D includes a state within ±0.12D that can be considered optically 0D.

[0043] In trial lens 2, it is preferable that the area occupancy rate of the segment portion 20 on the optical surface is 10% or more in a planar view. This makes it easier to obtain a myopia progression suppression effect, and thus makes it possible to smoothly perform eye examinations to evaluate the effect of myopia progression suppression lenses, etc. Furthermore, when applied to eyeglasses, it is preferable that the area occupancy rate of the segment portion 20 is 50% or less from the viewpoint of ensuring peripheral vision.

[0044] FIG. 2 exemplifies a case where the optical surface having the segment portion 20 faces toward the eyeball side. Since the lens thickness of the trial lens 2 is approximately 1 mm, when the optical surface having the segment portion 20 faces in the direction opposite to the eyeball side (that is, the object side), the corneal vertex distance becomes approximately 1 mm longer than that when the optical surface faces toward the eyeball side, and the apparent diameter of the clear area also changes. To prevent this, when setting the trial lens 2 in the trial frame 100, it is necessary to set the trial lens 2 such that the optical surface having the segment portion 20 always faces the same direction. Therefore, when the lens thickness of the trial lens 2 is 1 mm or more, the trial lens 2 preferably has a mechanism that allows the optical surface having the segment portion 20 to face a predetermined direction when accommodated in the trial frame 100. For example, a protrusion or the like may be provided on the lens frame 30 to form a mechanism that allows the trial lens 2 to be set in the trial frame 100 only when the optical surface having the segment portion 20 faces the predetermined direction.

[0045] The trial lens 2 preferably has a mechanism that prevents rotation around the optical axis of the lens when accommodated in the trial frame 100. For example, a protrusion or the like may be provided on the lens frame 30 to form a mechanism for preventing rotation. This can prevent the arrangement of the segment portion 20 from changing during optometry, so that optometry for evaluating the effect of a myopia progression inhibition lens or the like can be smoothly performed. This applies regardless of whether the arrangement of the segment portion 20 is rotationally symmetric or not.

[0046] Various commonly used lens substrates can be used as the lens substrate for Trial Lens 2. The lens substrate may be, for example, a plastic lens substrate or a glass lens substrate. The glass lens substrate may be, for example, a lens substrate made of inorganic glass. As a lens substrate, a plastic lens substrate is preferred from the viewpoint of being lightweight and less prone to breakage. Examples of plastic lens substrates include styrene resins such as (meth)acrylic resin, polycarbonate resin, allyl resin, allyl carbonate resin such as diethylene glycol bisallyl carbonate resin (CR-39), vinyl resin, polyester resin, polyether resin, urethane resin obtained by the reaction of an isocyanate compound with a hydroxyl compound such as diethylene glycol, thiourethane resin obtained by the reaction of an isocyanate compound with a polythiol compound, and cured products (generally called transparent resins) obtained by curing a curable composition containing a (thio)epoxy compound having one or more disulfide bonds in the molecule. The curable composition may also be called a polymerizable composition. As the lens substrate, an undyed one (colorless lens) or a dyed one (dyed lens) may be used. The thickness of the lens substrate is not particularly limited, but for example, the thickness (center thickness) may be about 0.7 to 30 mm. The refractive index of the lens substrate may be, for example, about 1.48 to 1.78. However, the refractive index of the lens substrate is not limited to this range, and may be within this range or outside of it. In this specification, the refractive index of the lens substrate refers to the refractive index for light with a wavelength of 546 nm.

[0047] (2) Ophthalmic trial lens set Next, the ophthalmic trial lens set of the present embodiment will be described. The ophthalmic trial lens set of the present embodiment is an ophthalmic trial lens set including a plurality of trial lenses for use by being set in a trial frame, and includes the trial lens 2 described in (1) above. Therefore, all the configurations and effects of the trial lens 2 described above are also applicable to the ophthalmic trial lens set of the present embodiment. As described in (1), even when the trial lens 2 is used alone, the effect of facilitating the evaluation of effects such as that of a myopia progression inhibition lens can be obtained. However, it is preferable to use an ophthalmic trial lens set including a plurality of trial lenses when accommodating users with a wide range of prescription powers, or when comparing the influence of different clear region diameters between the left and right eyes. Note that the ophthalmic trial lens set of the present embodiment may include lenses other than trial lenses (for example, ophthalmic lenses for prescription powers).

[0048] Preferably, the ophthalmic trial lens set includes a pair of trial lenses having mutually different clear region diameters. This facilitates evaluation of the influence caused by the difference in clear region diameter. In addition, by changing the clear region diameter according to the setting position where the trial lens is to be set, it becomes possible to adjust the apparent clear region diameter during optometry, which facilitates the evaluation of effects such as that of a myopia progression inhibition lens.

[0049] For example, among the plurality of setting positions of a trial frame 100, let the corneal vertex distance L1 of the first setting position 101 closest to the wearer be 12 mm, the corneal vertex distance L2 of the second setting position 102 second closest to the wearer be 20 mm, the corneal vertex distance L3 of the third setting position 103 third closest to the wearer be 24 mm, and the corneal vertex distance L4 of the fourth setting position 104 fourth closest to the wearer be 27 mm. Among these positions, the fourth setting position 104 has an excessively large difference from the corneal vertex distance of general spectacles (for example, 12 mm), so it is unsuitable as a position for setting a trial lens. Therefore, the case where the first setting position 101, the second setting position 102, and the third setting position 103 are used as positions for setting trial lenses will be described below.

[0050] As described above, the apparent clear area diameter of a trial lens changes depending on the setting position of the trial lens. Therefore, in order to realize multiple trial lenses (also called a series of trial lenses) with the same (or approximately the same) apparent clear area diameter, it is necessary to change the actual clear area diameter according to the setting position. For example, the ratio of the corneal vertex distance L2 at the second setting position 102 to the corneal vertex distance L1 at the first setting position 101 (L2 / L1) is 1.67. Therefore, if the ratio of the actual clear area diameter D1 of the trial lens for the first setting position 101 to the actual clear area diameter D2 of the trial lens for the second setting position 102 (D1:D2) is 1:1.67, the apparent clear area diameters of both will be the same. It is preferable to set an allowable range of about ±5% for the above ratio, taking into consideration that there may be some error in the corneal vertex distance and that the possible values ​​of the actual clear area diameter may be limited depending on the arrangement of the segment portion 20. Therefore, it is preferable that the ratio (D1:D2) of the actual clear area diameter D1 of the trial lens for the first set position 101 to the actual clear area diameter D2 of the trial lens for the second set position 102 is 1:1.67±0.08 (1:1.59 to 1.75). In this specification, "approximately equal apparent clear area diameters" means, for example, that they are within ±5% of the actual clear area diameter D1 of the trial lens for the first set position 101. For example, if the clear area diameter D1 is φ6.47 mm, then if the apparent clear area diameter is φ6.15 to 6.79 mm, the apparent clear area diameters are considered approximately equal, and they can be treated as the same series of trial lenses.

[0051] Similarly, the ratio of the corneal vertex distance L3 of the third set position 103 to the corneal vertex distance L1 of the first set position 101 (L3 / L1) is 2.00. Therefore, it is preferable that the ratio (D1:D3) of the actual clear area diameter D1 of the trial lens for the first set position 101 to the actual clear area diameter D3 of the trial lens for the third set position 103 is 1:2.00±0.10 (1:1.90 to 2.10).

[0052] Similarly, the ratio of the corneal vertex distance L3 at the third set position 103 to the corneal vertex distance L2 at the second set position 102 (L3 / L2) is 1.20. Therefore, it is preferable that the ratio (D2:D3) of the actual clear area diameter D2 of the trial lens for the second set position 102 to the actual clear area diameter D3 of the trial lens for the third set position 103 is 1:1.20 ± 0.06 (1:1.14 to 1.26).

[0053] In summary, it is preferable that the ophthalmic lens set includes a pair of trial lenses with a clear area diameter ratio of one of the following: 1:1.67±0.08, 1:2.00±0.10, and 1:1.20±0.06. It is even more preferable that the set includes three types of trial lenses with a clear area diameter ratio (D1:D2:D3) of 1:1.67±0.08:2.00±0.10. This makes it possible to realize a series of trial lenses with the same apparent clear area diameter, making it easier to evaluate the effects of myopia progression suppression lenses, etc. Furthermore, by having these trial lenses retain information such as the set position of the ophthalmic frame, human errors such as setting the trial lenses in the wrong position can be prevented, making it easier to evaluate the effects of myopia progression suppression lenses, etc.

[0054] The ophthalmic lens set preferably includes a pair of trial lenses in which the optical functions of the segment portion 20 are identical, but the clear area diameters are different. This makes it easier to evaluate the effects of differences in clear area diameter.

[0055] The ophthalmic lens set preferably includes a pair of trial lenses in which the optical function of the segment portion 20 and the diameter of the clear area are identical. This allows for the evaluation of the effects of myopia progression suppression lenses, etc., while wearing the same trial lenses in both eyes. It is also useful, for example, when, after a selection of myopia progression suppression lenses has been made, the same trial lenses are worn in both eyes to check how they look when applied to actual eyeglasses.

[0056] (3) Program for Eye Examination Lens Set The present invention is also applicable as a program for an eye examination lens set used in an eye examination lens set that includes a plurality of trial lenses for use when set in an eye examination frame. The configuration of the trial lenses and the eye examination lens set is as described in (1) and (2). Figure 4 is an example of a flowchart of the eye examination lens set program of this embodiment. As shown in Figure 4, the eye examination lens set program of this embodiment includes, for example, an information input step S1, an apparent clear area diameter calculation step S2, and a recommended trial lens calculation step S3.

[0057] (Information Input Step S1) Information input step S1 is a step in which information (hereinafter referred to as input information) including at least one of the following (a) to (e) is input into a computer. (a) Information on the diameter of the clear area (b) Information on the corneal vertex distance at the time of eye examination (c) Information on the eye examination frame (d) Information on the set position of the eye examination frame (e) Number or symbol information associated with at least one of the above (a) to (d) In input step S1, information held in the trial lens as described in (1) (i.e., information on the usage conditions that have been assumed in advance) may be input, or information on the conditions under which the eye examination is actually being performed may be input separately from the information held in the trial lens. Specifically, the examiner may manually input the information into the computer, or the information may be input by reading a two-dimensional code etc. attached to the trial lens with a scanner. This identifies the trial lens being used, the diameter of the clear area, the corneal vertex distance, the eye examination frame, the set position, etc. The input information may also include the wearer's biological information (prescription information and past treatment information).

[0058] In the information input step S1, if the number or symbol (identification information of the trial lens) in (e) above is entered, it is preferable that the program for the ophthalmic lens set is configured to look up the database attached to the ophthalmic lens set and display the information (a) to (d) above on a display unit such as a screen. This allows the examiner to easily understand the expected usage conditions (preferred usage conditions) of the trial lens.

[0059] (Apparent Clear Area Diameter Calculation Step S2) Step S2 is a step in which the computer calculates the apparent clear area diameter for the wearer of the eye examination frame in which the trial lens is set, according to the input information. For example, if the corneal vertex distance at the first set position 101 (or the corneal vertex distance of typical eyeglasses) is L1, the corneal vertex distance during the actual eye examination is Ln, and the actual clear area diameter is D, then the apparent clear area diameter can be expressed as D × (L1 / Ln). This makes it possible to accurately grasp the apparent clear area diameter, making it easier to evaluate the effects of myopia progression suppression lenses, etc.

[0060] (Recommended Trial Lens Calculation Step S3) The recommended trial lens calculation step S3 is a step in which the computer calculates a trial lens suitable for achieving a desired apparent clear area diameter, or the actual clear area diameter of the trial lens. For example, if the examiner wants to perform an eye examination using a series with an apparent clear area diameter of φ6.5 mm, the examiner inputs the value of an apparent clear area diameter of φ6.5 mm into the computer, and the computer calculates a trial lens that will result in an apparent clear area diameter of φ6.5 mm (which may include an error of ±5%, meaning the apparent clear area diameter should be between φ6.37 and 6.83 mm), or the actual clear area diameter of that trial lens. In this case, for example, it is calculated that a trial lens with an actual clear area diameter of φ13.10 mm should be set at the third set position 103, and the apparent clear area diameter will be φ6.55 mm. This makes it possible to understand which trial lens (and its usage conditions) should be used for the eye examination, and makes it easier to evaluate the effects of myopia progression suppression lenses, etc. The desired value for the apparent clear area diameter may be a value entered by the tester, a value predetermined by the program, or a value recommended by AI diagnosis, etc. When calculating the desired value by AI diagnosis, etc., the decision may be made based on the wearer's biological information, etc. Furthermore, the timing of executing the recommended trial lens calculation step S3 is not particularly limited and may be executed at any time.

[0061] <Other Embodiments of the Invention> Although embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the spirit of the invention.

[0062] For example, in the above-described embodiment, a trial lens and an ophthalmic lens set including said trial lens were described, in which at least one of the following information—information on the clear area diameter, information on the corneal vertex distance during ophthalmography, information on the ophthalmic frame, and information on the set position of the ophthalmic frame—is held as visually, optically, or electrically readable information. This is based on the second solution described in "Inventor's Findings" above. The present invention is also applicable as an ophthalmic lens set employing only the first solution. That is, by preparing an ophthalmic lens set including a pair of trial lenses with different clear area diameters, it becomes possible to adjust the apparent clear area diameter during ophthalmography, making it easier to evaluate the effects of myopia progression suppression lenses, etc. In this case, the adoption of the second solution is optional.

[0063] Furthermore, in the above embodiment, a trial lens 2 having a mechanism that ensures the optical surface on which the segment portion 20 is located faces a predetermined direction when it is housed in the eye examination frame 100 was described. However, by deliberately setting the optical surface on which the segment portion 20 is located in the opposite direction, the corneal vertex distance changes by the lens thickness (for example, 1 mm or more), and this can be used to adjust the apparent clear area diameter. In addition, in the apparent clear area diameter calculation step S2 described above, the apparent clear area diameter may be calculated reflecting the orientation in which the optical surface is set, or in the recommended trial lens calculation step S3 described above, an appropriate orientation for setting the trial lens may be recommended.

[0064] The size of the clear area diameter affects not only the peripheral field of view but also the field of view in cycloscopy. In the above embodiment, the case in which the apparent clear area diameter is calculated from the corneal vertex distance was described, but instead of the corneal vertex distance, the apparent clear area diameter may also be calculated from the distance from the rotation center point of the eye to the optical surface of the trial lens (hereinafter referred to as the rotation center distance). Since the standard distance from the rotation center of the eye to the cornea is 13 mm, for example, the rotation center distance at the first set position 101 is 25 mm, the rotation center distance at the second set position 102 is 33 mm, and the rotation center distance at the third set position 103 is 37 mm. Therefore, by preparing multiple trial lenses such that the ratio of the actual clear area diameter D1 of the trial lens for the first set position 101 to the actual clear area diameter D2 of the trial lens for the second set position 102 (D1:D2) is 1:1.32±0.07 (1:1.25 to 1.39), the ratio of the actual clear area diameter D1 of the trial lens for the first set position 101 to the actual clear area diameter D3 of the trial lens for the third set position 103 (D1:D3) is 1:1.48±0.07 (1:1.41 to 1.55), and the ratio of the actual clear area diameter D2 of the trial lens for the second set position 102 to the actual clear area diameter D3 of the trial lens for the third set position 103 (D2:D3) is 1:1.12±0.06 (1:1.06 to 1.18), a series of trial lenses that emphasize rotational vision can be realized. Whether to prioritize peripheral vision or rotational vision may be determined using conventionally known user characteristic measurements such as eye movement or head movement. Alternatively, a series of clear area diameters may be prepared for intermediate users, taking into account the field of view with a pseudo-center point midway between the corneal apex and the rotational center.

[0065] Furthermore, in the above embodiment, for convenience, the apparent clear area diameter was considered using the angle relative to the corneal apex as the visual angle when no eye movement is performed. More precisely, the entrance pupil, which is about 3 mm closer to the retina than the cornea, may be used as the reference point. For example, the distance from the entrance pupil to the first set position 101 is 15 mm, the distance from the entrance pupil to the second set position 102 is 23 mm, and the distance from the entrance pupil to the third set position 103 is 27 mm. Therefore, the ratio of the actual clear area diameter D1 of the trial lens for the first set position 101 to the actual clear area diameter D2 of the trial lens for the second set position 102 (D1:D2) is 1:1.53±0.08 (1:1.45-1.61), and the ratio of the actual clear area diameter D1 of the trial lens for the first set position 101 to the actual clear area diameter D3 of the trial lens for the third set position 103 (D1:D3) is 1:1.80±0.09 (1: 1.71 to 1.89) By preparing multiple trial lenses such that the ratio (D2:D3) of the actual clear area diameter D2 of the trial lens for the second set position 102 and the actual clear area diameter D3 of the trial lens for the third set position 103 is 1:1.17 ± 0.06 (1:1.11 to 1.23), a series of trial lenses with the same apparent clear area diameter can be realized, making it easier to evaluate the effects of myopia progression suppression lenses, etc. Note that the coordinates of the entrance pupil and rotation center may be values ​​measured for each wearer.

[0066] Furthermore, although the above embodiment described a method for realizing a series of trial lenses with the same apparent clear area diameter, it is also possible to use a single design of trial lenses at different set positions by taking advantage of the fact that the apparent clear area diameter changes depending on the set position of the trial lens. In this case, a single design of trial lenses can be used as multiple series of trial lenses with different apparent clear area diameters.

[0067] Furthermore, the present invention is not limited to trial lenses (eye examination lenses, eye examination lens sets), but can also be applied as clip-on lenses (filters) to be attached to single-vision spectacle lenses. In this case as well, it is preferable to prepare multiple clip-on lenses with different actual clear area diameters to minimize the apparent difference in clear area diameter caused by the corneal vertex distance (or rotational center distance). Furthermore, the present invention may be applied to lenses incorporated into a phoropter, or to lenses (filters) used as attachments to lenses incorporated into a phoropter.

[0068] Next, embodiments of the present invention will be described. These embodiments are examples of the present invention, and the present invention is not limited to these embodiments.

[0069] First, a series of trial lenses (Series A) with a wide clear area diameter was prepared. Figure 5 is a plan view of the area near the optical center point of the Series A trial lens. The segment portion of the Series A trial lens is a spherical micro-convex portion with a refractive power of 4.5D, a diameter of 0.45 mm, and an intercenter distance (pitch) of 1.3 mm. Since Series A is intended for eyeglasses with a clear area diameter of φ6.47 mm, trial lenses can be used as a series with approximately the same apparent clear area diameter as long as the apparent clear area diameter is within the range of φ6.15 to 6.79 mm.

[0070] The upper left diagram in Figure 5 shows a trial lens for the first set position 101 (corneal vertex distance L1 = 12 mm). The actual clear area diameter is φ6.47 mm, and the apparent clear area diameter is also φ6.47 mm. The upper right diagram in Figure 5 shows a trial lens for the second set position 102 (corneal vertex distance L2 = 20 mm). The actual clear area diameter is φ10.93 mm, and the apparent clear area diameter is φ6.56 mm. The lower left diagram in Figure 5 shows a trial lens for the third set position 103 (corneal vertex distance L3 = 24 mm). The actual clear area diameter is φ13.10 mm, and the apparent clear area diameter is φ6.55 mm.

[0071] Based on the above, it was confirmed that the three trial lenses of Series A have approximately the same apparent clear area diameter and can be used as part of the same trial lens series.

[0072] Next, a series of trial lenses (Series B) with a narrower clear area diameter was prepared. Figure 6 is a plan view of the area near the center point of the optical surface of the Series B trial lens. The design of the segment portion of the Series B trial lens is the same as that of Series A. Since Series B is intended for eyeglasses with a clear area diameter of φ4.10 mm, trial lenses can be used as a series with approximately the same apparent clear area diameter as long as the apparent clear area diameter is within the range of φ3.89 to 4.31 mm.

[0073] The upper left diagram in Figure 6 shows a trial lens for the first set position 101 (corneal vertex distance L1 = 12 mm). The actual clear area diameter is φ4.10 mm, and the apparent clear area diameter is also φ4.10 mm. The upper right diagram in Figure 6 shows a trial lens for the second set position 102 (corneal vertex distance L2 = 20 mm). The actual clear area diameter is φ6.47 mm, and the apparent clear area diameter is φ3.88 mm. The lower left diagram in Figure 6 shows a trial lens for the third set position 103 (corneal vertex distance L3 = 24 mm). The actual clear area diameter is φ8.60 mm, and the apparent clear area diameter is φ4.30 mm.

[0074] Based on the above, we confirmed that the three trial lenses in Series B have approximately the same apparent clear area diameter and can be used as part of the same trial lens series.

[0075] Furthermore, it is possible to compare and verify the effect of the clear area diameter using trial lenses from Series A and Series B. In addition, by storing information on the apparent clear area diameter and setting position in these trial lenses, human errors such as setting the trial lens in the wrong position can be prevented, making it easier to evaluate the effects of myopia progression suppression lenses, etc.

[0076] 1, 2 Trial lens 10 Base part 20 Segment part 100 Eye examination frame 101 First set position 102 Second set position 103 Third set position 104 Fourth set position S1 Information input step S2 Apparent clear area diameter calculation step S3 Recommended trial lens calculation step

Claims

1. A trial lens for use in an eye examination frame, wherein the optical surface of the trial lens comprises a base portion having the same refractive power as the center point of the optical surface, or the refractive power changing smoothly from the center point, and a plurality of segment portions having different optical functions from the base portion, and in a plan view, when the maximum diameter of a perfect circle in the area including the center point of the optical surface and consisting only of the base portion is defined as the clear area diameter, at least one of the following (a) to (e) is held as visually, optically, or electrically readable information. (a) Information on the diameter of the clear area (b) Information on the corneal vertex distance at the time of eye examination (c) Information on the eye examination frame (d) Information on the set position of the eye examination frame (e) A number or symbol associated with at least one of (a) to (d) above 2. An ophthalmic lens set including multiple trial lenses for use in an ophthalmic frame, wherein the optical surface of the trial lens has a base portion having refractive power equivalent to that of the center point of the optical surface, or where the refractive power changes smoothly from the center point, and a plurality of segment portions having different optical functions from the base portion, and in a planar view, when the maximum diameter of a perfect circle in the area including the center point of the optical surface and consisting only of the base portion is defined as the clear area diameter, at least one of the following (a) to (e) is held as visually, optically, or electrically readable information: (a) Information on the clear area diameter (b) Information on the corneal vertex distance at the time of ophthalmography (c) Information on the ophthalmic frame (d) Information on the set position of the ophthalmic frame (e) A number or symbol associated with at least one of (a) to (d) above 3. The ophthalmic lens set according to claim 2, comprising a pair of trial lenses having different clear area diameters.

4. The ophthalmic lens set according to claim 2, comprising a pair of trial lenses having a ratio of the clear area diameters of any of 1:1.67±0.08, 1:2.00±0.10, and 1:1.20±0.

06.

5. The ophthalmic lens set according to claim 2, comprising a pair of trial lenses in which the optical functions of the segment portions are identical and the diameters of the clear regions differ from each other.

6. The ophthalmic lens set according to claim 2, comprising a pair of trial lenses having the same optical function and the same clear area diameter in the segment portion.

7. The ophthalmic lens set according to claim 2, comprising a trial lens having a refractive power of 0D in the range that includes the center point of the optical surface and consists only of the base portion.

8. The eye examination lens set according to claim 2, comprising a trial lens in which the area occupancy rate of the segment portion on the optical surface is 10% or more in a plan view.

9. The eye examination lens set according to claim 2, comprising a trial lens having a thickness of 1 mm or more and having a mechanism such that when it is housed in the eye examination frame, the optical surface on which the segment portion is located faces a predetermined direction.

10. The eye examination lens set according to claim 2, comprising a trial lens having a mechanism to prevent the lens from rotating around the optical axis when it is housed in the eye examination frame.

11. A program for an ophthalmic lens set used in an ophthalmic lens set that includes multiple trial lenses for use in an ophthalmic frame, wherein the optical surface of the trial lens has a base portion having refractive power equivalent to the center point of the optical surface, or where the refractive power changes smoothly from the center point, and a plurality of segment portions having different optical functions from the base portion, and the program has a step of causing a computer to calculate the apparent clear area diameter for the wearer of the ophthalmic frame in which the trial lens is set, according to input information, when the maximum diameter of a perfect circle in a plan view that includes the center point of the optical surface and consists only of the base portion, the clear area diameter, and the input information includes at least one of the following (a) to (e): (a) Information on the clear area diameter (b) Information on the corneal vertex distance at the time of eye examination (c) Information on the ophthalmic frame (d) Information on the set position of the ophthalmic frame (e) A number or symbol associated with at least one of the above (a) to (d).

12. The program for an ophthalmic lens set according to claim 11, further comprising the step of causing a computer to calculate a trial lens suitable for the apparent clear area diameter to be a desired value, or the actual clear area diameter of the trial lens.

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