JPH05344953A - Lens meter - Google Patents

Abstract

PURPOSE:To obviate the necessity of storing and managing contact members individually and facilitate handling by installing a glasses lens contact member which is fixed on a lens meter body and vertically movable and supports a glasses lens on the periphery of a contact lens contact member. CONSTITUTION:On a contact lens contact member 11 which has a contact lens placing part 1a having a circular upper surface and cylindrical shape spreading downward, in the upper part, and is installed on a lens meter body 2, a guide groove 3 having a short horizontal part 3a and an inclined part 3b is cut on the periphery. A glasses lens contact member 5 which has a cylindrical upper surface and on which a pin 4 engaged with the guide groove 3 on the inner surface is projectingly installed is installed so as to envelope the contact lens contact member 1a from above. The glasses lens contact member 5 is turned, raised and engaged with the horizontal part 3a, and then the refractive index of the glasses lens is measured. When the glasses lens contact part 5 is lowered, the contact mode switch 6 of the lens meter body 2 is pushed down, and the contact lens contact member 1a is exposed outside, and a measurement state is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens meter widely used in eye clinics, eyeglass stores and the like.

[0002]

2. Description of the Related Art In recent years, an automatic lens meter has been widely used which automatically measures the apex refractive power of a lens to be inspected and displays the measurement result as a digital value and prints it out. In this type of lens meter, the cap-shaped lens mounting table is exchanged according to the type of the lens to be inspected, and when the lens to be inspected is in the alignment state, the lens to be inspected is held down by the pressing member to measure the spectacle lens and contact lens. Measurement is performed after manually changing the measurement mode when performing the measurement and changing the type of the measurement optical system, the alignment mark, the content display method such as the measurement value.

When measuring a progressive-focus lens, a dedicated alignment sheet prepared for each type of lens is used to mark the distance portion and the near portion, and the portion is measured with a lens meter. There is.

[0004]

However, in the conventional example, it is necessary to operate the measurement mode changeover switch for each measurement, and it is necessary to manage it so that the replaced lens mounting table is not lost. In addition, if the pressing member is operated with one hand after performing the alignment, the lens to be inspected may move, and the measurement also takes time.

When measuring a progressive lens,
It takes time and effort to mark the distance and near parts.
Further, when the lens is scratched or the like and the type of the lens is unknown, it is not possible to determine which alignment sheet should be used and measurement cannot be performed.

A first object of the present invention is to provide a lens meter which eliminates the inconvenience of the operation according to the above-mentioned measurement mode and has good operability.

A second object of the present invention is to provide a lens meter which can easily measure a progressive power lens.

[0008]

A first lens meter for achieving the above object comprises a spectacle lens which is vertically movable around a contact lens contact member which is fixed to a lens meter body and supports a contact lens. A spectacle lens contact member that supports the spectacle lens is provided.

The second lens meter is a lens meter for detecting a refraction value of the lens to be measured based on a light receiving position on the photoelectric sensor by receiving a light beam transmitted through the lens to be measured by the photoelectric sensor. Time detection means for measuring the refraction value of the lens to be inspected for each predetermined short time, and detecting the time during which the light beam transmitted through the lens to be inspected stays within the predetermined range on the photoelectric sensor, and the time detection means. And a means for determining a refraction measurement value of the lens to be inspected when the time detected by the means exceeds a predetermined time.

The third lens meter has a cylindrical lens mount having a small-diameter end portion for supporting a contact lens and a large-diameter end portion for supporting a spectacle lens, and an outer portion of the small-diameter end portion. And a fixing member fixed to the apparatus main body, the fixing member having an inner diameter substantially equal to the diameter and an outer diameter substantially equal to the inner diameter of the large diameter end portion.

The fourth lens meter includes a projection means for projecting a light beam on the lens to be inspected, an abutting member for abutting the lens to be inspected to set a position, and a light beam selecting means for selecting a part of the projected light beam. It has a detection means for detecting the selected light flux, a measurement value calculation means for calculating refraction information including prism information of the lens under test based on the detection result of the detection means, and a display means for displaying the alignment state. In the lens meter, the measurement value calculating means is characterized by executing the following means when measuring the distance dioptric power of the progressive power lens. (1) Means for storing the detected light flux information and the refraction information refraction information when the prism power in the left-right direction of the lens to be inspected is substantially zero. (2) When the prism power of the sequentially calculated measurement values is substantially zero, the calculated spherical power and the spherical power of the stored refraction information are compared, and the smaller detected light flux information and the refraction information are Means of storing.

The fifth lens meter includes a projection means for projecting a light beam on the lens to be inspected, an abutting member for abutting the lens to be inspected to set a position, and a light beam selecting means for selecting a part of the projected light beam. A lens meter having a detection means for detecting the selected light flux and a measurement value calculation means for calculating refraction information including prism information of the lens under test based on the detection result, wherein the measurement value calculation means is a progressive focus. It is characterized in that the following means are executed at the time of measuring the near power of the lens. (1) A means for measuring a distance portion of the lens to be inspected and storing refraction information thereof. (2) A means for comparing the refraction information stored sequentially with the refraction information stored therein, and storing the detected light flux information and the refraction information whose cylindrical power and its axis angle are substantially equal and whose spherical power is larger. ..

[0013]

In the first lens meter having the above-described structure, the examiner moves the spectacle lens contact member to a predetermined position according to the type of lens to be measured.

The second lens meter measures the refraction value of the lens to be inspected every predetermined time, and the refraction measurement is performed when the lens to be inspected does not move for a predetermined time or more and the light flux transmitted through the lens to be inspected does not move on the photoelectric sensor. The value is determined or marked.

In the third lens meter, the direction of the cylindrical lens mounting table is changed according to the type of the lens, and the cylindrical lens mounting table is fitted into the fixing member.

The fourth lens meter measures the test lens at any time, and when the prism degree in the left-right direction is substantially zero and the calculated value has a spherical power smaller than the stored value, the calculated value is the detected light flux of the distance portion. It is updated and stored as information and refraction information.

The fifth lens meter measures the lens under test at any time, and when the calculated value has a cylindrical power and an axial angle equal to the refraction information of the distance portion, and has a spherical power larger than the stored value, the calculated value is obtained. Is updated and stored as the detected light flux information and the refraction as the near dioptric power information.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 is an enlarged view of a lens contact portion of the first embodiment, showing a state in which a spectacle lens L is placed. A contact lens abutting member 1 attached to the lens meter main body 2 having a cylindrical contact lens mounting portion 1a having a circular upper surface with a diameter of about 4 to 5 mm and a widened hem.
A guide groove 3 composed of a short horizontal portion 3a and an inclined portion 3b as shown in FIG. A spectacle lens contact member 5 having a cylindrical shape with a diameter of the upper surface of about 8 to 10 mm, and a pin 4 engaging with the guide groove 3 protruding from the inner surface,
The contact lens abutting member 1 is provided so as to be wrapped from above, and when the eyeglass lens abutting member 5 is rotated, the pin 4 slides along the inclined portion 3b, and the eyeglass lens abutting member 5 moves up and down to move the eyeglass lens abutting member 5 up and down. As shown in, the contact lens mount 1a is exposed to the outside. When the spectacle lens contact member 5 is lowered, the contact lens mode switch 6 provided on the lens meter main body 2 is pressed to automatically enter the contact lens measurement state.

When measuring the refraction value of the spectacle lens L,
The examiner raises the spectacle lens contact member 5 by rotating it, and locks the pin 4 in the horizontal portion 3a of the guide groove 3 so that the pin 4 is positioned at the uppermost point as shown in FIG. In this state, the spectacle lens L is placed on the spectacle lens contact member 5 to perform alignment, and then the measurement is performed. When the spectacle lens L is placed, the weight of the spectacle lens L causes the spectacle lens contact member 5 to receive a downward force, but the pin 4 causes the horizontal portion 3a to move.
The spectacle lens abutting member 5 does not descend downward because it is locked to.

When measuring the refraction value of the contact lens C, the examiner rotates the spectacle lens contact member 5 until the spectacle lens contact member 5 strikes the lens meter body 2 as shown in FIG. Lower the contact lens mount 1a
Expose. At this time, the contact lens mode switch 6 is turned on, and the state of the measurement optical system (not shown) is switched. Then, the contact lens C is placed on the placing portion 19 and measurement is performed.

FIG. 4 shows another example of the guide groove 3. Although the spectacle lens contact member 5 is rotated and moved up and down in the above-described embodiment, an inverted L-shaped guide groove 3 as shown in FIG. 4 may be provided so that the eyeglass lens contact member 5 can be moved up and down quickly.

FIG. 5 is an enlarged view of the lens contact portion of the second embodiment. Similar to the first embodiment, the upper end of the cylindrical main body 1b of the contact lens abutting member 1 having a widened hem is
A circumferential groove 7 is provided on the side surface. The cap-shaped eyeglass lens abutting member 5 is provided with a projecting portion 8 that engages with the groove 7, and by pushing the projecting portion 8 from above the contact lens abutting member 1 to rotate the eyeglass lens. The contact member 5 is fixed to the contact lens contact member 1.

Thus, by making only the spectacle lens contact member 5 into the cap shape, the storage and management of the lens contact member becomes easier than the replacement of two kinds of contact members.

In the above embodiment, the groove 7 is provided on the contact lens contact member 1 side and the projection 8 is provided on the spectacle lens contact member 5 side. The protruding portion 8 and the spectacle lens contact member 5 on the member 1 side
There is no problem even if the groove 7 is provided on the side.

FIG. 6 is a block diagram of the refraction value measuring system for the lens to be inspected of the third embodiment. On the optical axis O1 from the light source 11,
A lens 12 for converting a light beam into parallel light, a lens L to be tested, a ring-shaped contact member 13, and five apertures 14a as shown in FIG.
A mask 14, a lens 15, and a television camera 17 having an image sensor 16 are arranged. TV camera 1
The output of 7 is connected to the CPU 18, and the TV camera 1 displays data and alignment marks on the TV monitor 19.
The output image from 7 is displayed. Further, on the side of the lens L to be inspected, controlled by the CPU 18,
A marking point member 20 for printing the center position and astigmatism direction of the lens to be inspected L on the lens to be inspected L is provided, and is configured to be inserted into and removed from the optical path by a drive unit 21.

The light source 11 constantly emits light, and five spot images transmitted through the opening 14a of the mask 14 are displayed on the television monitor 19. An alignment mark M is displayed in the vicinity of the central spot image of the mask 14, and when the optical axis of the spectacle lens L and the optical axis O1 of the optical system match, the central spot image and the alignment mark M match. It has become. The magnitude of the refractive power of the spectacle lens L is calculated by the CPU 18 from the position of each spot image.

At the time of measurement, the examiner moves the spectacle lens L back and forth and left and right to align the spectacle lens L. The refraction value is constantly monitored during the alignment work, and the CPU
The refraction value is set to about 18 times by the TV monitor 19 per second.
To display. According to the program of the CPU 18, when the light flux on the image pickup device 16 does not move for, for example, 1 second or more, it is automatically determined that the examiner has the intention to measure the refraction value even if the optical axis is not aligned. I do. In this case, since the measurement can be performed even if the optical axes are not aligned, the measurement can be performed even when the optical axis is slightly out of alignment and the condition is bad.

The minimum value of the astigmatism during the alignment work is stored and compared with the astigmatism at the time of measurement.
It is convenient to make measurements when the size is smaller than this. Also,
Asphericity may be used instead of astigmatism in a progressive focus lens. The end of measurement is notified to the examiner by electronic sound or the like. The marking point member 2 is an automatic marking point member which is operated by the driving unit 21, and when the spectacle lens L matches the optical axis center and stays there for a certain period of time, the driving unit 21 automatically moves the marking point member 20 into the optical path. By driving, the center position of the spectacle lens L and the astigmatic direction are marked. The mechanism for obtaining the optical axis of the spectacle lens L is not limited to the above-described embodiment, and a system for obtaining the optical axis of the projected light flux or the center of gravity of the entire light flux by using the refraction value detection optical system of the spectacle lens L is used. If so, the configuration does not matter.

FIG. 8 is a block diagram of the fourth embodiment. A lens 32, a fixing member 33 for mounting a lens to be inspected, a lens 34, and six lenses are arranged on the optical axis 02 in front of the light source 31. 6-hole diaphragm 35 having a small hole, lens 36, two-dimensional image sensor 3
7 are sequentially arranged. The contact member 33 includes a cylindrical receiving port 33a and a cylindrical fixing portion 33b,
The socket 33a is combined with the fixed portion 33b, and the socket 3
The eyeglass lens L to be inspected or the contact lens C to be inspected is placed at the end of 3a. Here, the receiving port 33a is composed of a large diameter portion and a small diameter portion, and the large diameter portion is the fixing portion 3a.
3b is fitted from the outside, and when the receiving port 33a is reversed, the small diameter part is fitted to the inside of the fixed part 33b.
The eyeglass lens contact surface of the receiving port 33a and the 6-hole aperture 35
Are arranged in a conjugate manner, and the lens 34 and the two-dimensional image sensor 37 are
Are arranged conjugate with each other by the lens 36.

As shown in FIG. 8, the small-diameter portion of the receiving port 33a is fitted into the fixing portion 33b, and then the spectacle lens L is brought into contact with the contact member 3.
When the light source 31 is attached to the light source 3, the luminous flux is reflected by the lens 32.
Is converted into parallel light by and enters the spectacle lens L. The transmitted light of the spectacle lens L passes through the inside of the receiving port 33a and the fixed portion 33b, passes through the lens 34, becomes 6 spot lights by the 6-hole diaphragm 35, and forms an image on the two-dimensional image sensor 37 via the lens 36. The image obtained by the two-dimensional image sensor 37 is analyzed by a computer (not shown), and the refractive power of the spectacle lens L is calculated.

When measuring the refractive power of the contact lens C,
As shown in FIG. 9, the receiving opening 33a is reversed, the large diameter portion is attached to the fixed portion 33b, and the refractive power is measured by the above-mentioned eyeglass lens L.
The same is done as in the case of. Since the contact lens C contacts the small diameter portion of the receiving port 33a, there is no inconvenience even if the contact lens C having a small radius of curvature is placed.

As described above, in this embodiment, since the receptacle 33a is inverted and replaced so that both the contact lens C and the spectacle lens L can be measured, the risk of loss of the cap as in the conventional case is small.

10 and 11 are sectional views of the fifth embodiment, in which the aperture 40 having six holes corresponding to the six-hole aperture 35 is provided in the receiving port 33a in the fourth embodiment, and the small diameter portion is provided. Is cut short.

Therefore, the contact lens C shown in FIG.
At the time of measurement, compared to the mounting state of the spectacle lens L shown in FIG.
It will approach the 7 side. With such a configuration, it is possible to cancel the aberration generated in the contact lens C when measuring the contact lens C.

FIG. 12 is a block diagram of the sixth embodiment. On the optical axis 03 in front of the measurement light source 41, a collimator lens 42 for collimating the light flux, a contact member 43 for supporting the lens L to be inspected, a lens 44, and on the optical axis 03 as shown in FIG. Hole 45a and four holes 45b provided around it in contrast
A perforated diaphragm 45 having 45e and a photographing element 46 are sequentially provided. The image pickup element 46 is driven by the image pickup element drive circuit 47 to output a video signal, and the output video signal is passed through the arithmetic control means 48, the symbol generating means 49, and the synthesizing means 50, and the images 45a ′ to 45e ′ by the perforated diaphragm 45.
Is displayed on the television monitor 51 together with the alignment mark M synthesized by the symbol generating means 49. The arithmetic control unit 48 is connected to the input unit 52 and the measurement light source 41, controls the entire apparatus by an input signal from the input unit 52, and determines the lens to be inspected based on the positional relationship of the light flux image on the imaging element 46. The refractive power of L and the degree of prism are calculated.

When measuring the refractive index of the lens L to be measured, if the lens L to be measured is a spherical lens, the lens L to be measured is brought into contact with the contact member 43. When the measurement light source 41 emits light,
The light flux becomes parallel light by the collimator lens 42, is bent by the lens L to be inspected, passes through the perforated diaphragm 45, and forms an image on the imaging element 46. Since the position of the image of the porous diaphragm 45 depends on the magnitude of the refractive power of the lens L to be inspected, the refractive power of the lens L to be inspected is calculated by analyzing the image formation position of the image on the photographing element 46. be able to. Images 45a ′ to 45e ′ of the aperture stop 45 are displayed together with the alignment mark M on the television monitor 51, and the image 45a of the hole 45a is displayed.
The lens L to be inspected is moved so that a ′ and the alignment mark M on the television monitor 51 coincide with each other, and when they coincide with each other, the input means 52 is pressed to calculate the refractive power by the arithmetic control means 48, and the measurement is completed.

FIG. 14 is an explanatory view when the lens L to be inspected is a progressive-focus lens. Unlike the spherical lens, the progressive-focus lens L ′ fitted in the spectacle frame 54 has an optical center.
L0, the distance measurement part La, and the near measurement part Lb are located at different parts. The distance measuring portion La is a point above the optical center L0 where the right and left prism degrees are 0 and the spherical power is the minimum.
Further, the near-distance measuring unit Lb is located in the lower part inside the optical center L0,
This is the point with the highest spherical power. At a portion called a progressive zone Lc that extends from the distance portion measuring portion La through the optical center L0 to the near portion measuring portion Lb, the cylindrical power and the cylindrical axis angle are constant, and the spherical power increases. FIG. 15 shows the magnitude of the spherical power measured along the progressive zone Lc.

In the progressive-focus lens as described above, when measuring the distance portion, the lens L to be inspected is applied to the contact member 43 to start the measurement. When the measurement is started, the arithmetic and control unit 48 continuously calculates the refractive power and the prism power. At this time, when the lens L to be inspected is moved little by little in the vicinity of the distance portion such that the light beam passes through the distance portion of the lens L to be inspected, first, the prism degree in the left-right direction is substantially zero. Memorize the measured value, then sequentially compare the measured value with the stored measured value, detect the position where there is no prism degree in the left-right direction and the spherical power is smaller, and store the position and the measured value, The alignment mark is moved to the central light beam position. FIG.
FIG. 4 is an explanatory diagram of the television monitor 51, and the alignment mark M moves onto the aperture images 45a ′ to 45e ′.

In this way, the lens to be inspected is used as the distance measuring unit La
By moving for a while in the vicinity, the alignment mark M moves to the center of the near-distance portion where there is no prism on the left and right and the spherical power is the minimum in the measurement up to that point, and the alignment mark M does not move thereafter. After that, since the position of the alignment mark M is almost the distance portion, the distance portion can be measured by combining the measurement light beams and measuring the value. The measurement procedure is shown in the flowchart of FIG.

In the measurement of the near portion, after the distance portion is measured and the measured value is stored, the input means 52 is used to switch to the near dioptric power measurement mode, and the lens L to be tested is applied to the contact member 43 for measurement. Start. When the measurement is started, the calculation / control unit continuously calculates the refractive power and the prism degree as in the distance portion.
At this time, if the lens is moved little by little in the vicinity of the near-distance portion so that the light beam passes through the near-distance measuring portion Lb of the lens L to be measured, the measured value and the measurement stored by the distance portion measurement are sequentially performed. Compared with the value, the cylinder power and its axis angle are almost the same,
If the spherical power is higher, the position and the measured value are stored, and the alignment mark M is moved as in the distance measurement.

As described above, the near-distance measuring unit of the lens L to be measured
By moving the lens L to be inspected for a while near Lb, the cylindrical power and its axial angle match, and the alignment mark M moves to the center of the near-distance measuring unit Lb with the maximum spherical power. M will not move. After that, the measurement light flux is aligned with the alignment mark M and the value thereof is measured, whereby the near portion can be measured, and the measurement of the progressive-focus lens is completed. This measurement procedure is shown in the flowchart of FIG.

The measured value when the alignment mark M is moved may be displayed as the final measured value. Further, in the above-described embodiment, the squeeze image 45a 'to the television monitor 51 is displayed.
45e 'is displayed directly, but the aperture image 45a'-4
Instead of 5e ', aperture images 45a'-4 as shown in FIG.
It is also possible to display the mark M1 corresponding to 5e ′ and align the alignment mark M with the mark M1 when the alignment is completed.

Further, as shown in FIG. 20, the alignment mark M may be fixed to the center of the television monitor 51 and a mark M2 indicating the amount and direction of deviation from the correct alignment position may be displayed.

Further, although the image pickup device is used in the fifth embodiment, the light beam position may be detected by using a position detector, a one-dimensional line sensor or a photo sensor. Further, although the television monitor 51 is used as the alignment state display means, the invention is not limited to this, and an LED or liquid crystal display means may be used without any problem. The method of measuring the refractive power of the lens to be inspected is not limited to the above-mentioned embodiment, and other methods such as the conventional manual method may be used.

[0045]

As described above, in the first and third lens meters, two types of contact members are separately stored and managed by switching the lens contact member between the spectacle lens and the contact lens. There is no need to do it, and it is easy to handle. Further, when the lens to be inspected does not move for a predetermined time or more like the second lens meter, the refraction value of the lens to be inspected is automatically measured or marked to improve the operability.

Further, even in a progressive-focus lens whose measuring portion is difficult to understand with the fourth and fifth lens meters, the refractive power can be easily measured without using an alignment sheet prepared for each lens type. be able to.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a front view of a groove.

FIG. 3 is an explanatory view of the operation of the first embodiment.

FIG. 4 is a front view of another groove.

FIG. 5 is a configuration diagram of a second embodiment.

FIG. 6 is a configuration diagram of a third embodiment.

FIG. 7 is a front view of a mask.

FIG. 8 is a configuration diagram of a fourth embodiment.

FIG. 9 is an explanatory diagram when measuring a contact lens.

FIG. 10 is a sectional view of an abutting member of a fifth embodiment.

FIG. 11 is a sectional view of a contact member.

FIG. 12 is a configuration diagram of a sixth embodiment.

FIG. 13 is a front view of a diaphragm.

FIG. 14 is an explanatory diagram of a progressive-focus lens.

FIG. 15 is a graph showing a relationship between spherical powers on a progressive zone.

FIG. 16 is an explanatory diagram of a television monitor.

FIG. 17 is a flowchart of distance measurement.

FIG. 18 is a flow chart of near vision measurement.

FIG. 19 is an explanatory diagram of an alignment state.

FIG. 20 is an explanatory diagram of another alignment state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Contact lens contact member 3 Guide groove 4 Pin 5 Eyeglass lens contact member 6 Switch 7 Groove 8 Protruding part 11, 31, 41 Light source 13, 43 Contact member 14 Mask 16, 37 Image sensor 19, 51 Television monitor 20 Marking member 33 Contact member 52 Input means

Claims (13)

[Claims] 1. A lens meter, wherein a spectacle lens abutting member that is vertically movable and supports a spectacle lens is provided around a contact lens abutting member that is fixed to a lens meter body and supports a contact lens. 2. The lens meter according to claim 1, wherein the lens meter main body is switched to a contact lens measurement state by moving the spectacle lens contact member. 3. A lens meter for detecting a refraction value of the lens to be detected based on a light receiving position on the photoelectric sensor, wherein a light beam transmitted through the lens to be inspected is received by a photoelectric sensor. A time detection unit that measures a value for each predetermined short time, and detects the time during which the light flux that has passed through the lens under test stays within a predetermined range on the photoelectric sensor, and the time detected by the time detection unit. And a means for determining a refraction measurement value of the lens to be inspected when is longer than a predetermined time. 4. A means for confirming that the optical axis of the lens under test and the optical axis of the measuring optical system coincide with each other, and a marking point for automatically marking the optical axis of the lens under test according to the confirmation. The lens meter according to claim 3, further comprising: 5. A cylindrical lens mount having a small-diameter end on the side supporting a contact lens and a large-diameter end on the side supporting a spectacle lens, and an inner diameter substantially equal to the outer diameter of the small-diameter end. And a fixing member having an outer diameter substantially equal to the inner diameter of the large-diameter end portion and fixed to the apparatus body. 6. A projection means for projecting a light beam on a lens to be inspected, an abutting member for abutting the lens to be inspected to set a position, a light beam selecting means for selecting a part of the projected light beam, and a selected light beam. A lens meter having a detecting means for detecting, a measurement value calculating means for calculating refraction information including prism information of the lens to be inspected based on a detection result of the detecting means, and a display means for displaying an alignment state, The lens meter, wherein the measurement value calculating means has the following means when measuring the distance dioptric power of the focusing lens. (1) Means for storing the detected light flux information and the refraction information refraction information when the prism power in the left-right direction of the lens to be inspected is substantially zero. (2) When the prism power in the left-right direction of the sequentially calculated measurement values is substantially zero, the calculated spherical power and the spherical power of the stored refraction information are compared, and the smaller detected light flux information and the above Means for storing refraction information. 7. The lens meter according to claim 6, wherein a detected light flux position at the time of storing both information is displayed based on the detected light flux information and the refraction information which are sequentially stored. 8. The lens meter according to claim 6, wherein the stored detected light flux information and refraction information are displayed as a distance dioptric power. 9. The lens according to claim 6, wherein based on the detected light flux information and the refraction information that are sequentially stored, a difference between a detected light flux position at the time of storing the both information and a current detected light flux position is displayed. Meter. 10. A projection means for projecting a light beam on a lens to be inspected, an abutting member for abutting the lens to be inspected to set a position, a light beam selecting means for selecting a part of the projected light beam, and the selected light beam. In a lens meter having a detection means for detecting, a measurement value calculation means for calculating refraction information including prism information of the lens under test based on the detection result, and a display means for displaying an alignment state, a progressive focus The lens meter, wherein the measured value calculating means has the following means when measuring the near dioptric power of the lens. (1) A means for measuring a distance portion of the lens to be inspected and storing refraction information thereof. (2) A means for comparing the refraction information stored sequentially with the refraction information stored therein, and storing the detected light flux information and the refraction information whose cylindrical power and its axis angle are substantially equal and whose spherical power is larger. .. 11. The lens meter according to claim 10, wherein a luminous flux position at the time of storage is displayed based on the detected luminous flux information and the refraction information which are sequentially stored. 12. The lens meter according to claim 10, wherein the detected light flux information and the refraction information stored are displayed as a near dioptric power. 13. A difference between a detected light flux position at the time of storage and a current detected light flux position is displayed based on the detected light flux information and the refraction information which are sequentially stored.
The lens meter described in.