JP2507645Y2 - Layout aids for eyeglass lenses - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a layout aid for spectacle lenses, and in particular, has a high optical function that requires accurate layout work when the lenses are fitted into the spectacle frame. The present invention relates to a layout auxiliary tool most suitable for a single-focus lens such as an aspherical lens.

[Prior Art] In order to make good spectacles that are easy for the user to use and exhibit good optical functions, the layout work during the framing process for fitting the spectacle lens into the spectacle frame is extremely important. In this layout work, it is necessary to accurately grasp the prescription of the spectacle user, the information on the spectacle frame, the optical information of the lens, and the like, and good spectacles are made based on the accurate grasp of these information.

In the conventional general lens layout work, for example, an eyeglass frame fitted with a temporary lens with no power is hung on a patient who is an examinee, and an examiner facing the patient visually determines the position of the patient's pupil center. Mark on the temporary lens,
There is a method of determining a correct frame insertion position in the eyeglass frame.

On the other hand, a special progressive multifocal lens having a distance vision center and a near vision center on the lens requires a high degree of fitting accuracy. Therefore, regarding the layout work for framing the progressive multifocal lens, conventionally, as a means for assisting the layout, while confirming whether or not the spectacle frame to be framed is a spectacle frame suitable for the progressive multifocal lens. A framing aid exclusively for progressive multifocal lenses that can be laid out, and a framing aid with lens layout information written on it has been proposed (Shokaisho 63-12025).

As described above, in the past, there was a dedicated framing aid for the progressive multifocal lens, but with the currently marketed single focus lenses, etc., the layout work was considered relatively easy, so The marking method described above was mainly used, and no special layout aid for framing was proposed.

[Problems to be Solved by the Invention] However, even with a single-focus lens, for example, in an aspherical lens designed based on the angle of rotation of the eyeball in human eye physiology and the relationship between the eyeball frame and the eyeball, There has been a problem that a high-precision fitting is required in the frame-layout work, and the conventional marking method is insufficient. In other words, since an aspherical lens exhibits a useful optical function only after accurate fitting is performed, the conventional easy fitting method described above cannot exhibit a useful optical function based on the lens design concept of the aspherical lens. There was a problem.

The object of the present invention is that even a single-focus lens can be used for correctly framing a single-focus lens such as an aspherical lens for which accurate fitting and accurate layout are required due to its high optical function. An object is to provide a framing aid for spectacle lenses.

[Means for Solving the Problems] A layout aid for a spectacle lens according to the first aspect of the present invention includes an index indicating an eye point when looking at infinity,
An index that indicates the distance eye point used to prescribe distance vision glasses, an index that displays the lens effective diameter drawn centering on this index indicating the distance eye point, and to keep the spectacle frame horizontal. And a horizontal auxiliary display means used for the.

A layout aid for a spectacle lens according to a second aspect of the present invention includes an index indicating an eye point when looking at infinity,
Two indexes are provided corresponding to the left and right eyes, respectively, which indicate near-eye points used for prescribing near-glass, and each of these two indexes indicating near-eye points. It is configured to include an index for displaying the effective diameter of the lens drawn as the center and a horizontal auxiliary display means used for keeping the spectacle frame horizontal.

[Operation] According to the first aspect of the present invention, when the chart by this auxiliary tool is applied to the distance glasses in which the eye point at infinity is found, the eye point at infinity and the infinity point on the chart are applied. It is possible to find the distance vision eyepoint by simply matching the index indicating the eyepoint of, and this enables the distance vision glasses to be easily laid out and the eyeglass frame and the distance vision glasses lens selected by the patient. The suitability can be determined.

According to the second aspect of the present invention, when the chart by this auxiliary tool is applied to the distance glasses in which the eye point at infinity is found, the eye point at infinity and the eye point at infinity on the chart are applied. It is possible to find out the near-vision eye points corresponding to the left and right lens frames by simply matching the index indicating The suitability of the spectacle lens can be determined.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front view showing a first embodiment of a spectacle lens layout assistant according to the present invention. The layout aid of this embodiment is a distance eyepoint chart used for the layout of distance glasses.

1 is a chart displayed on the layout assisting tool according to the present invention. The layout aid itself is a paper-like display. Further, the layout assisting tool can be formed of a transparent sheet as a whole. In this case, a plastic sheet having a required material thickness and flexibility is suitable.

In the chart 1, a horizontal reference line 2 and a vertical reference line 3 are arranged so as to be orthogonal to each other. In the upper and lower regions of the horizontal reference line 2, two horizontal line groups 4 each having a pitch of 4 mm and parallel to each other are indicated by broken lines. Horizontal line group 4 consisting of horizontal reference line 2 and four broken lines
Is used as an auxiliary line for holding the horizontal state of the spectacle frame when the spectacle frame of the distance spectacles is placed on the chart 1 for the purpose of layout.

5 is the intersection of the horizontal reference line 2 and the vertical reference line 3,
The center position of the distance eye point (F-EP) is shown. A circular mark 6 with a black frame having an inner diameter of 4 mm and an outer diameter of 6 mm is drawn around the intersection 5. The circular mark 6 is the first index on the chart 1. The intersection 5 and the circular mark 6 are used to determine the position of the eye point (F-EP) of the distance glasses. Further, 8,9,10 are circles drawn centering on the intersection 5 forming the center of the circular mark 6, and the numerical values of diameters 65φ, 70φ, 75φ are shown corresponding to each. These values correspond to the types of lens diameters of lens groups that are commercially available. In this configuration, when the eyepoint in the eyeglass frame selected by the patient is made to coincide with the eyepoint in the chart 1 and the simulation of the framed state is performed, the lenses necessary for framed in the eyeglass frame are circled by circles 8, 9 and 10. You can know the diameter.

Reference numeral 7 is a cross-shaped mark, the center point 7a of which is present at a position 4 mm vertically above the intersection 5. The mark 7 is an index indicating an eye point (S-EP) when looking directly at infinity (horizontal) distance, and is a second index on the chart 1.

It should be noted that the horizontal reference line 2 and the vertical reference line 3 are drawn as thin solid lines, and therefore can be distinguished from the line on which the mark 7 is drawn.

With the above configuration, in Chart 1, the eye point (S-EP) when looking straight into infinity while wearing glasses
Index 7 and the eye point (F-E
It is shown by distinguishing it from index 6 in P). The reason for this is
This is to obtain a fitting that is faithful to the line of sight, which will be described in detail with reference to FIGS. 3 and 4. As shown in FIG. 3, normally, the distance between the spectacle lens 21 and the cornea 22, which are assumed to be in the upright state, is 12 mm, the corneal vertex 22a and the eyeball 2 are
It is already known that the distance from the rotation center 23a of 3 is 13 mm. Further, when a person actually wears the spectacles, the spectacles are usually worn in a state where the spectacles have a constant inclination angle θ as shown by a broken line 24 in FIG. This inclination angle θ is about 10 ° as shown in FIG. Therefore, in the actual state of wearing spectacles, the direction of the line of sight 25 of the eyeball 23 of the wearer also corresponds to the position of the spectacle lens 24, the downward direction with respect to the horizontal line of sight 26 facing the direction at infinity, and θ Forming an angle. Therefore, the S-EP and the F-EP are provided in the assisting tool 1 in consideration of the actual state of wearing the glasses and the positional relationship between the eyes. That is, there is an intersection between the horizontal line of sight 26 at infinity and the spectacle lens, and an intersection between the line of sight 25 at natural distance and the spectacle lens. When these intersections are represented on the spectacle lens, the center points of the marks 7 are respectively represented.
The intersection 5 is located at the center of 7a and the circular mark 6, and the distance between these two intersections on the lens surface is approximately 4 mm. Based on the above reason, S in conventional infinity vision
In order to easily derive the F-EP actually needed from -EP, S-EP and F-EP are written together in Chart 1 with a reduction width of approximately 4 mm.

Next, a method of using the chart 1 having the above-described structure will be described with reference to FIGS. 1 and 5 to 9.

First, the eye point (S-EP) when looking directly at infinity is determined. There are various determination methods, and as an example, a known datum line chart 31 as shown in FIG. 5 can be used. The datum line chart 31 itself is a well-known chart to those skilled in the art, and thus detailed description thereof is omitted. The procedure for determining the S-EP based on the datum line chart 31 is as follows. First, the left and right eyes 32,3 of the patient who is the wearer
The pupillary distance (PD) 34 of 3 is measured (see FIG. 6). Next, the eyeglass frame 35 selected by the patient, which is provided with a transparent temporary lens, is kept horizontal, and the datum line chart 31 is applied to the eyeglass frame 35 to form the datum line 36 which is the geometric horizontal line of the eyeglass frame 35. Fill in the temporary lens of the frame with a marker (see Fig. 7). Next, the pupil distance PD is calculated from the center of the left and right lens frames of the spectacle frame 35, and the PD line 37 is written on each of the left and right temporary lenses (see FIG. 8). As a result, in each of the left and right lens frames 35A and 35B of the eyeglass frame 35, S
-EP38 can be determined (see Figure 9).

The mark 7 of the chart 1 shown in FIG. 1 is aligned with the S-EP 38 on the left and right of the spectacle frame 35 determined by using the datum line chart 31 as described above, and 4 m below the mark 7.
Find the intersection 5 (F-EP) at the position of m, and find this intersection 5
Mark the surface position of the temporary lens corresponding to. In this case, if it is performed while looking at the horizontal reference line 2 on the chart 1, the horizontal state of the spectacle frame 35 can be easily maintained. In this way, it is possible to easily determine the natural distance eyepoint for performing the framed layout.

As another method of using the chart 1, as described above, the chart 1 is formed as a transparent sheet, and the chart 1 is used as a frame of a temporary lens in a state where eye points for distance glasses are matched. You can also paste it directly and check if the distance eyepoints are actually laid out correctly. That is, since the circular mark 6 is written around the intersection 5 as a center, if the layout is not performed properly, the black frame forming the circular mark 6 obstructs the view of the wearer, so that the wearer can appropriately adjust to the natural appearance. You will not be able to see far. Therefore, the layout state can be easily checked.

Further, by placing a circular lens of the cloth on the chart 1 with its diameter properly adjusted to the chart 1, it is possible to find a measurement reference position for obtaining optical information of the cloth lens.

FIG. 2 is a front view showing a second embodiment of a layout aid for a spectacle lens according to the present invention. The layout aid of this embodiment is a near eyepoint chart used for the layout of near glasses.

In the chart 11, a horizontal reference line 12 and a vertical reference line 13 which are arranged so as to be orthogonal to each other are shown. Horizontal reference line
In the upper and lower areas of 12, two horizontal lines 14 each having a pitch of 6 mm and parallel to each other are indicated by broken lines. The horizontal line group 14 consisting of the horizontal reference line 12 and four broken lines is
When an eyeglass frame for near vision is placed on the chart 11 for the purpose of layout, it is used as an auxiliary line for maintaining the horizontal state of the eyeglass frame.

15a is a point located on the horizontal reference line 12 and displaced from the vertical reference line 13 by 2.5 mm to the right in the figure. This point corresponds to the near eye point (L-NEP) of the left lens frame. Indicates the center position. Centering on this point 15a, inner diameter 4 mm, outer diameter 6 mm
A mark 15 forming a part of a circle with a red frame is drawn. This mark 15 is an index indicating the near-vision eye point of the left-eye lens. The point 15a and the mark 15 are used to determine the position of the left eye lens eye point of the near glasses. Further, 18A, 19A, 20A are semicircles drawn around a point 15a forming the center of the mark 15, and numerical values of diameters φ65, φ70, and φ75 are shown corresponding to the circles. These values correspond to the types of lens diameters of lens groups that are commercially available. In such a configuration, the eye point of the left lens frame in the spectacle frame selected by the patient is set to the chart 11
When performing the simulation of the framed state in conformity with the eye point in, the lens diameter required to frame the left lens frame of the eyeglass frame can be known by the semicircles 18A, 19A, 20A.

On the other hand, 16a is a point which is also on the horizontal reference line 12 and displaced by 2.5 mm from the vertical reference line 13 to the left in the figure. This point is the near eye point (R) of the right lens frame.
-NEP) indicates the center position. Centering on this point 16a, inner diameter 4m
A mark 16 forming a part of a circle with a red frame having an outer diameter of 6 mm and m is drawn. This mark 16 is an index indicating the near eye point of the right eye lens. The point 16a and the mark 16 are used to determine the position of the eye point for the right eye lens of near vision glasses. 18B, 19B, and 20B are semicircles drawn around a point 16a that is the center of the mark 16. In such a configuration, when the eyepoint of the right-eye lens frame in the spectacle frame selected by the patient is matched with the eyepoint in the chart 11 to perform the simulation of the framed state,
The semicircles 18B, 19B, and 20B can be used to know the lens diameter required for framing the right lens frame of the spectacle frame.

In the above, marks 15 and 16, half circles 18A and 18B, 19A and 1
9B, 20A, and 20B are drawn integrally with each other on the vertical reference line 13.

Also, the vertical reference line 13 located 6 mm above the horizontal reference line 12
The center point 17a of the cross mark 17 is shown above,
The mark 17 is an index indicating the eye point (S-EP) when looking directly at infinity (horizontal) distance. The S-EP and the R-NEP and L-NEP described above are distinguished from each other for the purpose of performing fitting that is faithful to the line of sight. In the case of near-distance glasses, since they are generally used for looking at their hands, their usage patterns and wearing situations are different from those of ordinary distance-wear glasses. Therefore, it is assumed that the inclination angle of the spectacle frame is 15 ° from the upright state at the time of infinity viewing shown in FIG. 3, and on the spectacle lens, that is, on the corresponding chart 11, S-EP It is a lower position of about 6 mm from the index 17 of
And about 2.5m to the left and right considering the congestion of the left and right eyes
The indexes 15, 16 of R-NEP and L-NEP are set and described at the positions displaced by m. As a result, the N- of the left and right lenses actually required from the conventional S-EP for infinity viewing
EP can be derived easily.

The chart 11 according to the second embodiment having the above configuration,
Basically, it has the same function as the chart 1 of the first embodiment and is used in the same manner. The different point is that natural near vision is assumed, near glasses are used for prescription, and the left half and the right half of the chart 11 are used for each of the left and right lens frames of the spectacle frame.

[Effects of the Invention] As is apparent from the above description, according to the present invention, it is possible to perform a layout work for the correct framing of the spectacle lens by an extremely simple operation, and it is possible to perform a high optical performance such as an aspherical lens. It is possible to realize more accurate fitting of a single-focus lens having a function and effectively exert its optical function. Furthermore, it is possible to judge whether or not the spectacle frame desired by the wearer and the spectacle lens are compatible, and in the case of incompatibility, the information of the compatible lens diameter or the spectacle frame is provided and processed. It is possible to easily check whether or not the lens is processed according to the correct layout, or to check the near vision line. Furthermore, the measurement reference position can be easily found in the texture lens.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of a layout assisting tool according to the present invention, FIG. 2 is a front view showing a second embodiment of a layout assisting tool according to the present invention, and FIGS. FIGS. 5 to 9 are explanatory diagrams showing the positional relationship between the wearing state of eyeglasses and the eyeballs, and FIGS. 5 to 9 are explanatory diagrams showing how to use the layout assisting tool. [Explanation of Codes] 1,11 is a chart as a layout aid, 2,12 are horizontal reference lines, 3,13 are vertical reference lines, 4 and 14 are horizontal line groups, and 5 and 6 are for prescribing distance glasses An index indicating the eyepoint position of
7,17 is an index showing the eye point position when looking directly at infinity, and 8,9,10,18A, 18B, 19A, 19B, 20A, 20B are indices showing the effective diameter of the lens, 15 and 15a and 16 respectively. Reference numerals 16a and 16a are indexes indicating eyepoint positions when prescribing the left and right lens frames of the near-glasses, respectively.

Claims (2)

(57) [Scope of utility model registration request] 1. An index indicating an eye point when looking at infinity, an index indicating a distance eye point used for prescribing distance glasses, and an index indicating the distance eye point. A layout aid for a spectacle lens, comprising: an index for displaying the drawn effective diameter of the lens; and a horizontal auxiliary display means used for keeping the spectacle frame horizontal. 2. An index showing an eye point when looking at infinity, and a near eye point provided for each of the left eye and the right eye and used for prescribing near eyeglasses. Two indexes, an index showing the lens effective diameter drawn centering on each of these two near-eye points, and a horizontal auxiliary display means used to keep the spectacle frame horizontal. A layout aid for spectacle lenses, which is characterized by being provided.