JPS60148538A - Display selection method of eye refraction force - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an eye refractive power display selection method in which a measurement result of eye refractive power is converted and displayed using a desired conversion parameter.

Conventional automatic eye refractive power measurement devices measure the refractive power of the eye to be examined and use it for correction. A method is adopted in which the measurement results are converted and displayed using conversion parameters depending on the number of signs. Conventionally, this conversion parameter was fixed, or
Or even if it is variable, the type is selected by a slide switch placed in an out of sight part of the device. As contact lenses have become more popular in recent years, there are more opportunities to use both eyeglass lenses and contact lenses at the same time. There is a demand for a system in which conversion parameters can be switched. That is, in order to provide a universal device, it is necessary to provide a mechanism that can arbitrarily change the display method.

An object of the present invention is to provide an eye refractive power display selection method that maintains the same operation as the conventional slide switch method while improving operability. In an eye refractive power display method in which a conversion parameter can be selected, measurement results are converted and displayed using a conversion parameter selected by a selection switch, the selected conversion parameter is written and stored in a memory by actuation of a storage switch, and the power is turned off again. This method is characterized in that the stored conversion parameters are used preferentially to display the conversion when the eye refractive power is measured. It is customary to display the appropriate refractive power depending on the correction method using spectacle lenses, contact lenses, etc. The display method is as follows:
VP depending on whether it is a contact lens or a spectacle lens.
(VertexDisturb) O1 or 12.0
Three types of 113.5 (or 13.75) mm are adopted, and three types of -, +/-10 depending on the way the astigmatism code is attached are adopted, and nine types of display are adopted by combining these. It will be done.

In the present invention, two or more sets of frequently used display parameters are memorized and selected by cycling them in order with a single pushbutton switch, or with a single seesaw set pushbutton switch or two sets of display parameters. It can be selected by cycling up and down using independent bushing switches. Furthermore, it has a memory switch, and when the memory switch is turned on, the selected conversion parameter is stored as the conversion parameter that becomes the center of circulation, so that it is possible to more easily select the intended conversion parameter when the power is turned on again. There is. This function has the advantage that, for example, the conversion parameters that will be the first start when the power is turned on can be selected using this memory switch.

The method according to the invention will now be explained in detail on the basis of the illustrated embodiment.

FIG. 1 is a block diagram of an apparatus for implementing the method according to the present invention, which includes two types of switches and allows selection of N types of conversion parameters by sequentially cycling through them. In FIG. 1, reference numeral 1 denotes a measuring head of an automatic eye refractive power measuring device including an optical system. Data measured here is sent to a CPU 3 via an input/output circuit 2, and the refractive power is calculated in this CPU 3. Ru. This calculated value is RAM (Random
AccessMemory) 4, N OV RA
M (Nonvolatile Static RAM)
5 and ROM (Read Only Memory
) is converted according to the conversion parameters stored in step 6, and sent to the CRT (Catho
deRay'Lube) 8. Also,
The measurement head 1 is equipped with a TV right camera, and a video signal of an image of the external eye of the eye to be examined is transmitted to the TV input/output circuit 7. 9 is a data bus, 10 is an address bus, and 11 is a data bus.
12 is a selection switch, 12 is a memory switch, and 13 is an input/output circuit. The on/off states of these switches 11 and 12 are taken into the CPU 3 via the input/output circuit 13,
It is determined by the CPU 3 and stored in the RAM 4 or NOVRAM 5.

On the screen of the CRT 8 shown in FIG. 2, the upper half displays the external eye image P, the measurement results are displayed on the second line of the lower half, and the display conversion parameters are displayed on the third line.

Next, these operations will be explained according to the flowchart in FIG. 3, where N types of conversion parameters are Vl-V.
It is assumed that each of the data is written in the address AI-An of the ROM 6. Further, the number of times the selection switch 11 is pressed is stored in the RAM 4 in the form of an increment count, and this count number N corresponds one-to-one with the address An of the conversion parameter Vn of the ROM 6, and when the count number N is the conversion parameter The conversion is assumed to be Vn. Furthermore, this count is equivalent to a ring counter with an upper limit of N, and ■, 2.3, φ...N, l
, 2.3, .PHI.. The count progresses as follows.

NOVRAM5 is RAM! l-EEPROM (Ele
Critically Erasable And Pr
ogrammableRead 0nly Memor
y) is formed on one chip, and has two control lines.

Write from RAM to EEFROM by
This is an element that allows reading from PROM to RAM. That is, the NOVRAM 5 becomes a writable non-volatile memory that does not require battery backup if recall and store commands are applied when the power is turned on and off. Note that this NOVRAM 5 can of course be replaced with a battery-backed RAM.

Now, in the flowchart of FIG. 3, when the power is turned on, a recall command is issued to the NOVRAM 5 in step 1, and data is written from the EEFROM in the NOVRAM 5 to the RAM.

Step 2: The count number N is transferred from this RAM to the RAM 4, and the conversion parameter Vn corresponding to this count number N is selected from the ROM 6 and displayed on the CRT 8. Proceeding to step 3, it is checked whether the selection switch 11 is pressed. If it is pressed, 1 is added to the count number in the RAM 4 in step 4, and the corresponding conversion parameter Vn is displayed on the CRT 8. Note that here N
The count of RAM in OVRAMS remains unchanged.

If the selection switch 11 is not pressed, step 5
Then, it is checked whether the memory switch 12 is pressed. If the memory switch 12 is not pressed, the process proceeds to step 9, where it is checked whether a measurement switch (not shown) is pressed.

If the memory switch 12 is pressed in step 5, the count number in the RAM of NOVRAM 5 and the count number in RAM 4 are compared in step 6, and if there is no difference between the two, proceed to step 9, but if there is a difference, R in step 7
The count number is transferred from AM4 to the RAM of NOVRAM5, and in step 8 a store command is issued to write the count number to the EEFROM of NOVRAM5. Also, step 5
If there is no difference, the process proceeds to step 9, and if the measurement switch is not pressed in step 9, the process returns to step 3, and test scanning of the selection switch 11 and memory switch 12 is repeated until the measurement switch is pressed. Step 9
If it is confirmed that the measurement switch has been pressed, the refractive power is measured in step 10, and the result is converted in step 11 using the conversion parameter Vn written in the ROM 6 corresponding to the count number N in the RAM 4. The value is then displayed on the CRT 8 in step 12. Furthermore, step 1
Step 3 prints out the numerical values obtained by a printer not shown in the block diagram of FIG. 1, and returns to step 3 to prepare for the next measurement.

With the above-mentioned function, the display conversion parameters can be selected by cycling through them in order with a single button switch, and since a circulation method is adopted in which the display conversion parameters start from the display conversion parameters stored with the memory switch 12, the user can It has the advantage of being able to select mainly the conversion parameters that are most frequently used.

FIG. 4 is a flowchart when the selection switch 11 is replaced with two types of switches, for example, a seesaw type or two independent bushing switches, and one is used as an up-count switch and the other as a down-count switch. This step is inserted in place of step 3.4 in the flowchart of FIG. In step 3a of FIG. 1, it is checked whether or not the up-counting switch is pressed. If it is pressed, 1 is added to the count number in RAM 4 in step 4a, and the same procedure as in step 4 of FIG. 3 is carried out. The conversion parameter Vn is displayed on the CRT 8, and the process moves to the next step 5.

If the up-counting switch is not pressed, it is checked in step 3b whether the down-counting switch is pressed. If the down-counting switch is pressed, 1 is subtracted from the count in the RAM 4 in step 3C, the corresponding conversion parameter Vn is displayed on the CRT 8, and the process moves to step 5.

In this case as well, although it is a circulation type as mentioned above,
By providing a down function, the most frequently used combination can be quickly selected.

As explained above, the eye refractive power display selection method according to the present invention allows the selected conversion parameters to be written into the memory, and the stored conversion parameters can be used when the power is turned on again, making the operation extremely easy. It becomes easier.

[Brief explanation of drawings]

The drawings show an embodiment of the eye refractive power display selection method according to the present invention, FIG. 1 is a block circuit diagram of an apparatus for realizing this method, FIG. 2 is an explanatory diagram of an example of a CRT screen display, and FIG. 3 and 4 are flowcharts. Code 1 is the measurement head, 3 is the CPU, 4 is the RAM, and 5 is the N
OVRAM, 6 a ROM, 8 a CRT, 11 a selection switch, and 12 a switch. Patent applicant Canon Co., Ltd. Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. In an eye refractive power display method in which a conversion parameter of a measurement result can be selected, the measurement result is converted and displayed according to the conversion parameter selected by a selection switch, and the selected conversion parameter is stored by a storage switch. A method for selecting an eye refractive power display, characterized in that the stored conversion parameters are written and stored in a memory by the operation of the converter, and the stored conversion parameters are preferentially used to display the conversion when the power is turned on. 2. The eye refractive power display selection method according to claim 1, wherein the memory is a non-volatile memory. 3. According to claim 1, the storage operation is not performed if the stored conversion parameter matches the conversion parameter to be stored when the storage switch is activated. How to select eye refractive power display. 4. The eye refractive power display selection method according to claim 1, wherein two or more types of conversion parameters are circulated in one direction by actuation of the selection switch. 5. The eye according to claim 1, wherein the selection switch is a scene switch or two independent bushing switches, and is capable of bidirectionally cycling the conversion parameter by incrementing it on one side and decrementing it on the other side. How to select refractive power display. 6. The eye refractive power display selection method according to claim 1, wherein the selected conversion parameter is displayed on a CRT for displaying measurement results.