JP2803117B2 - Multifocal spectacle lens position display device - Google Patents

Description

The present invention relates to a display device for displaying the position of a multifocal spectacle lens.

[Conventional technology]

Conventionally, processing of a lens with addition (multifocal spectacle lens) is performed by changing the position of the addition part of the lens with addition depending on the type of the lens, or by moving the lens position of the distance prescription, Since the lens had to be adjusted, the lens was expensive and failed in many cases, and had to be taken by a skilled person.

In addition, most of the positioning is based on intuition, and there are cases where the processing is not performed satisfactorily for the spectacle wearer.

[Problems to be solved by the invention]

For example, the conventional processing method as described above has the following problems.

(1) In order to adjust the lens, it is inevitable to refer to the mark at the center of the distance portion of the lens. It is hard to understand.

(2) For the same reason, it is not possible to cope with the difference in the positional relationship between the distance portion and the near portion depending on the type of lens. In particular, the near position tends to depend on the lens.

(3) The multifocal lens includes a fuse type, a trifocal type, a progressive focus type, and the like. In these lenses, the mark indicating the near portion does not always have the same meaning. For this reason, there is room for confusion in locating the lens in the near portion, and the lens position is not correctly adjusted.

(4) As a result, spectacles using a multifocal spectacle lens tend not to accurately reflect the near pupil distance (nearPD), despite the aim of improving near vision.

(5) There is also a problem with relation to the eyeglass frame. That is, since the positions of the small balls and the near portion are predetermined on the lens, if a person with little experience processes the lens, the near portion may be located outside the spectacle frame (the near portion). Will not be cut by the processing machine)
There are cases where it is missing. This occurs because it is not easy to grasp the relationship between the positional relationship on the lens and the spectacle frame.

(6) Similarly, many of these lenses have a regular outer shape, and conversely, they are sometimes too small (cannot be processed) as compared with the eyeglass frame.

The present invention has been made in order to solve the above problems.

[Means for solving the problem]

In order to solve the above problems, the present invention is as follows.

That is, the present invention provides input means (D, E, 3) for inputting multifocal spectacle lens data, spectacle frame shape data, and prescription data, and data input by the input means (D, E, 3). In response, the multi-focal spectacle lens, the spectacle frame, and the calculating means (B) for calculating the positional relationship between the eye of the wearer and the calculating means (B).
The position of the multifocal spectacle lens, the position of the spectacle frame,
Display means (8) for displaying the position of the wearer's eye overlapping with the position of the wearer's eye.

[Action]

In the present invention, since the position of the spectacle frame shape and the position of the multifocal spectacle lens shape are displayed on the display while being aligned with the patient's eyes, regardless of the type of multifocal spectacle lens used, In addition, even unskilled persons can make a frame close to the ideal. The distance between the near pupils and the position of the eye at that time are adjusted to the optimal position on the display while observing the wearing state of the spectacle frame, and data on the positional relationship between the spectacle frame and the multifocal spectacle lens at that time. Is sent to the spectacle lens processing device, the multifocal spectacle lens can be processed into an optimum shape in relation to the spectacle frame.

That is, since the processing result can be obtained in advance by using the image on the display, failure and loss in lens processing can be minimized.

Specifically, by performing the following prescription, (a) a person who needs a prescription mainly for distance use (b) a person who requires a prescription mainly for near use (especially, desk work is a central Respond to the needs of two people.

In other words, for the people of FIG. 5A, the glasses must be processed so that the distance is made as wide as possible and at the same time, the fitting error does not come far and near. The PD is strictly matched with the distance PD, and the PD for the near is being developed.

Also, for the people of (b), this is done in the completely opposite way.

Furthermore, for those in between (a) and (b),
It is necessary to enable a prescription that balances (a) and (b).

Therefore, the prescription is displayed on the front screen with a display such as (1) making eyeglasses with a long distance, (2) making eyeglasses with a near distance, or an option such as "Please input the ratio of distance." , Input for distance, PD,
Decide the prescription ratio or emphasis on near-use PD.

If this ratio is determined, the horizontal shift amount d from the distance center to the near center is calculated from the data of the multifocal spectacle lens. When using a fixed multifocal spectacle lens, the difference between the far PD and the near PD of the glasses themselves cannot be taken except 2d, so
Let ΔPD be the distance from the actual human perspective PD, and define the perspective importance ratio
Assuming that 1: t, FarPD = far PD− (2d−ΔPD) t / (t + 1) nearPD = near PD + (2d−ΔPD) / (t + 1), thereby providing optimal glasses to the spectacle wearer.

In this device, it is possible to display on the display unit which position of the lens frame has the near portion of the lens and the position of the far portion of the lens.

After such a relationship is shown on a display, the relationship can be easily moved and shown by an input from an input device.

This allows the wearer to put on the spectacle frame and determine an optimal position as compared with the position.

If the position on the screen can be freely moved by the operator, the display is the actual size or the same magnification, so the near portion, the far portion can be moved as if moving on the spectacle frame, Moreover, the positional relationship thus input is
Since it is digitized by the calculation device, it can be easily synthesized with the spectacle frame data, and can be easily converted into numerical data for controlling the spectacle lens processing device.

Therefore, if the numerical data is input to the spectacle lens processing device, a desired processed lens can be easily obtained.

〔Example〕

Hereinafter, the present invention will be described based on embodiments shown in the drawings.

FIG. 1 shows an embodiment of the present invention, wherein a position display device for a multifocal spectacle lens comprises a keyboard section A, a microcomputer section B, and a display section C. A keyboard (1) for selecting a type as a part of lens type selecting means of the focal spectacle lens; a keyboard (2) for selecting a type as a part of lens type selecting means of the multifocal spectacle lens; The microcomputer unit B includes an input keyboard (3) as input means for prescription data, and the microcomputer unit B includes a first arithmetic unit (4) and a lens type selecting unit (D) together with the type selecting keyboard (1). Type selection keyboard (2)
The second arithmetic unit (5) constituting the lens type selecting means (E) together with the output of the first arithmetic unit (4) and the second arithmetic unit (5) displays various selected data on the display device (8). A first display command section (6) for outputting a command signal for causing the multi-focal glasses to output a command signal for displaying the multi-focal spectacles on the first calculation section (4), the second calculation section (5) and the data input keyboard (1). A second display command unit (7) for outputting a command signal for aligning the lens shape with the spectacle frame shape and the eye of the spectacle wearer and superimposing and displaying them on the display device (8); The unit C displays various data of the multifocal spectacle lens according to the command signals from the first display command unit (6) and the second display command unit (7), and displays the multifocal spectacle lens shape,
The shape of the spectacle frame and the eye of the spectacle wearer are aligned at the actual size or at the same magnification so that the mutual positional relationship matches the spectacle wearing state, and are superimposed and displayed.

FIG. 2 is a flowchart of the microcomputer (B) in the block diagram shown in FIG.
The operation of the microcomputer will be described with reference to FIG.

Since the apparatus having the function of displaying the processing result of the multifocal spectacle lens is also convenient to have a function of displaying the processing result of the normal lens other than the multifocal spectacle lens, the microcomputer (B) is turned on when the power is turned on. A menu is displayed on the display device (8) to select either normal lens processing or multifocal eyeglass lens processing (step 20).

Here, when the operator selects the multifocal spectacle lens processing routine using the type selection keyboard (1) of the keyboard unit (A), the multifocal spectacle lens processing result display function operates (step 21). .

When the multifocal spectacle lens function is selected, the first arithmetic unit (4) of the microcomputer (B) causes the first display command unit (6) to display the lens type on the display device (8) (step). twenty two). For example, ask what type of multifocal spectacle lens is, and use the type selection keyboard (1) to select the lens type.
The fuse type, (2) three-focus type, and (3) progressive focus type are displayed.

Then, when the operator selects any one of the above three types (step 23), the second arithmetic unit (5) sets the first
The type of lens is displayed on the display device (8) by the display command section (6) (step 24). The type of the lens is stored in the memory of the microcomputer (B) in advance, and the contents are read out and sequentially displayed on the display device (8). Then, the operator selects a keyboard (2)
When the lens type is selected by the operator (step 25), the first arithmetic unit (4) displays various data of the selected lens on the display device (8) by the first display command unit (6) (step 26). . When it is desired to select a special lens which is not stored in the memory of the microcomputer (B) in advance as a lens type, a message for inputting the characteristics of the lens to the keyboard by a command from the type selection keyboard (2). May be displayed on the display device (8). In this case, according to the message on the display device (8), the operator may move the distance from the geometric center of the lens to the distance center or the distance from the distance center. Enter the distance to the vertices and other values.

When the type and type of the lens are determined in this way, the process proceeds to a prescription input.

In the prescription input, first, the shape data of the spectacle frame is input using the input keyboard (3) (step 27). This input is performed by inputting the shape data of the spectacle frame, the name, and the size in a memory in the microcomputer (B) in association with each other, and displaying the name of the spectacle frame on the display device (8). The user may input the name of the spectacle frame by simply inputting the name, or may simply input the name and size of the spectacle frame without displaying the data on the display device (8). The shape data of the spectacle frame may be obtained from the memory. Of course, in order to cope with a spectacle frame in which the shape data has not been input in advance, it is preferable to be configured so that the numerical value of the shape data of the spectacle frame can be input. In any case, when the shape data of the spectacle frame is input from the input keyboard (3), the second display command unit (7) inputs whether to perform the lens processing based on the distance reference or the near reference. Is displayed on the display device (8) so as to be specified by the keyboard (3) (step 28), and when the distance reference is selected, the display device (8) is operated so as to input numerical values of the distance PD. (Step 29). On the other hand, when the near reference is selected, a near PD is displayed on the display device (8) so as to input a numerical value (step 30).

When the distance PD or the near PD is input, the program proceeds to input the eye height position on the spectacle frame (step
31). In this input, the left and right eye positions may be numerically input as a number of centimeters below the spectacle frame and a number of centimeters from the center of the spectacle frame. The index indicating the height position may be freely movable, and the position may be directly set by operating the index moving key on the keyboard.

When the prescription input is completed in this way, the second display command unit (7) positions the multifocal spectacle lens shape, the spectacle frame shape, and the eye position of the spectacle wearer on the display device (8). And superimposed and displayed (step 32). At this time, various shape data may also be displayed. The multifocal spectacle lens shape, the spectacle frame shape, and the position of the eye of the spectacle wearer are aligned, and by looking at the screen displayed in a superimposed state, the operator can perform processing after processing the unprocessed spectacle lens. Since the positional relationship between the lens and the spectacle frame can be known, the suitability of the selected lens and the selected spectacle frame can be determined. If not, step 22
Then, the data such as the type, type, and frame shape are set again. In this way, an optimal combination can be selected.

FIG. 3 shows an example of display on the display device (8). FIG. 3 shows a case in which a multifocal spectacle lens of a fuse type having small balls is used, and the outer shape of the unprocessed lens is shown.
P ₁ , the raw lens small ball P ₂ , the eyeglass frame outline P ₃ , and the wearer's eye P ₄ are left and right aligned based on the input data, and displayed together with other data in a superimposed state. ing.

〔The invention's effect〕

As described above, according to the present invention, since the positional relationship of the multifocal spectacle lens becomes clear on the spectacle frame, in processing the multifocal spectacle lens, failure to cut out small balls and the near portion are eliminated. Mistakes are eliminated for any unskilled person.

In addition, since the balance between near use and long use can be determined according to the wearer, the most comfortable glasses can be obtained even for the spectacle wearer.

Furthermore, since the external shape data can be viewed in a state where the data is superimposed on the eyeglass frame and aligned with the eyeglass frame, as in the case of the small ball, it is possible to know in advance the mismatch of the lens eyeglass frame and prevent it.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG.
FIG. 3 is a flowchart showing the operation of the microcomputer of the embodiment shown in FIG. 3; FIG. 3 is a diagram showing an example of display by the display device;
It is. (Explanation of symbols of main parts) A: Keyboard part, B: Microcomputer part, C: Display part, 1: Keyboard for type selection, 2: Keyboard for type selection, 3: Keyboard for input, 4... A first computing unit, 5... A second computing unit, 6... A first display command unit, 7.

Claims (2)

(57) [Claims] 1. An input means for inputting multifocal spectacle lens data including a distance portion position and a near position portion, spectacle frame shape data, and prescription data including a distance pupil distance or a near pupil distance. And, according to the data input by the input unit, a multifocal spectacle lens, a spectacle frame, and a calculating unit that calculates the respective positional relationship between the eye of the wearer and the calculating unit, A position display device for a multifocal spectacle lens, comprising: display means for displaying the position of the multifocal spectacle lens, the position of the spectacle frame, and the position of the eye of the wearer in an overlapping manner. 2. The multifocal spectacle lens position display device according to claim 1, wherein said display means displays said multifocal spectacle lens data input from said input means.