Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – For interpupillary distance measuring or lens positioning
Reexamination Certificate
2000-02-22
2001-07-10
Manuel, George (Department: 3737)
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
For interpupillary distance measuring or lens positioning
Reexamination Certificate
active
06257721
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for spectacles for measuring eye points of a subject with respect to a spectacle frame.
2. Description of Related Art
In adjusting spectacles, it is important to measure eye points, such as the sighting position (visual line position) of a customer (hereinafter referred to as a subject) with respect to a spectacle frame selected by the subject and the pupillary distance.
Conventionally, for the measurement of the eye points, methods such as a method of marking the sighting position (visual line position) of the subject on spectacle lenses with a marker pen by the inspector with the subject sighting horizontally, and a method of attaching an eye point marking sticker at the position of the sight by confirming the near sighting position (visual line position) and the position of the pupils at a short distance (so-called mirror method) have been executed.
Moreover, for obtaining the inter-pupillary center distance (hereinafter referred to as PD),a pupillary distance measuring device has been used (see U.S. Pat. No. 4,944,585). Further, the PD has been measured by an eye refractive power measuring apparatus for automatically measuring the refractive power of an eye (see U.S. Pat. No 5,764,341).
Furthermore, an apparatus for photographing the face of a subject with a spectacle frame on by a television camera for finding the eye points by the photographed image (see JP-A-9-145324) has been proposed.
However, since the method of marking with a marker pen and the method of attaching a sticker executed according to observation of the sighting state of the subject by the inspector, it is highly dependent on the positional relationship between the subject and the inspector, and the experience of the inspector, and thus it is liable to be inaccurate. Moreover, these methods requires much time in measurement.
Further, since the PD obtained by the pupillary distance measuring device or the eye refractive power measuring apparatus is utilized for adjusting spectacles without examining the position with respect to the spectacle frame, it is liable that the pupillary center and the optical center of the produced spectacles do not coincide. Moreover, although the pupillary distance measuring device is fixed to the face of the subject by a nose contact member, since the nose shapes of subjects vary, an error can easily be generated depending on the contacting state.
Furthermore, the apparatus for finding the eye points from the photographed image by the television camera requires a complicated apparatus configuration, and thus a problem of a high cost is involved. Moreover, since the apparatus is the objective type, it is disadvantageous in that whether or not the measured position is correct cannot be confirmed by the subject himself. Further, according to the apparatus, since the face of the subject is photographed by the television camera in a fixed state, the measured eye position can be inaccurate depending on the difference of the targeted distance of sight in use by the subjects.
Furthermore, recently, progressive (progressive multi-focus) lenses have been demanded increasingly. In the case of a progressive lens, positioning with respect to the eyes is particularly important compared with the case of a single focus lens. That is, it is necessary to measure the eye points for the far vision and the near vision further accurately for a progressive lens, depending on the subject's environment of use. However, the eye points for the far vision and the near vision in a progressive lens cannot be measured accurately according to conventional methods and apparatus. Moreover, the subject cannot learn easily how the optical pattern distribution of the progressive lenses with different styles provided by different manufacturers can influence his vision in relation to the position of the eye points.
SUMMARY OF THE INVENTION
In view of the prior art, an object of the invention is to provide a device for measuring the subjective eye points of the subject himself quickly with a simple configuration.
Moreover, another object of the invention is to provide a device for measuring the eye points of the subject accurately in the state according to the environment of use of the subject.
The present invention provides the followings:
1) A device for spectacles for measuring eye points of a subject, comprising:
presenting means for presenting an index to the subject;
varying means for varying a positional relationship between an eye of the subject and the index; and
measuring means for measuring the eye points of the subject based on information about the positional relationship between the subject's eye and the index.
2) The device for spectacles according to 1), wherein the presenting means comprises:
a transmission type display disposed adjacent to a spectacular frame of a spectacles worn by the subject; and
display control means for showing on the display a graphic pattern for measuring an eye point each corresponding to the left eye and the right eye as the index, with the graphic pattern provided such that the subject can judge whether or not the positional relationship between the graphic pattern and the sight of the subject directed to a chart is appropriate,
the varying means comprises:
moving means for moving the graphic pattern so as to dispose the graphic pattern and the subject's sight with a predetermined positional relationship,
the measuring means comprises:
detecting means for detecting a moving amount by the moving means; and
determining means for determining the eye point of the subject based on the detected moving amount.
3) The device for spectacles according to 2), further comprising mounting means for mounting the display on the spectacular frame front surface of the spectacles worn by the subject.
4) The device for spectacles according to 2), wherein the graphic pattern comprises a small spot-like light transmission region, with the light transmission region provided with a larger light transmission amount compared with a peripheral region thereof.
5) The device for spectacles according to 2), wherein the moving means comprises means operable by the subject himself, and
the device for spectacles further comprising voice guide means for generating a voice guide for guiding the operation by the subject in measuring the eye point.
6) The device for spectacles according to 2), wherein the display control means further shows on the display a second graphic pattern for measuring a position of an inner periphery of the spectacular frame.
7) The device for spectacles according to 6), wherein the second graphic pattern comprises a longitudinal line and a lateral line.
8) The device for spectacles according to 1), wherein the presenting means comprises:
a transmission type display disposed adjacent to a spectacular frame of a spectacles worn by the subject; and
first display control means for showing on the display a graphic pattern for measuring an eye point each corresponding to the left eye and the right eye as the index,
the varying means comprises:
moving means for moving the graphic pattern so as to dispose the graphic pattern and the subject's sight with a predetermined positional relationship,
the measuring means comprises:
detecting means for detecting a moving amount by the moving means, and
determining means for determining the eye point of the subject based on the detected moving amount,
the device for spectacles further comprising:
memory means for storing a distribution pattern of a far-vision region, a progressive region, and a near-vision region in a progressive lens, and
second display control means for displaying the distribution pattern on the display.
9) The device for spectacles according to 8), wherein the second display control means determines a display position of the distribution pattern based on at least one of the detection result by the position detecting means and the determination result by the determining means.
10) The device for spectacles accordin
Hayashi Akihiro
Hosoi Yoshinobu
Manuel George
Nidek Co. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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