Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – For interpupillary distance measuring or lens positioning
Reexamination Certificate
2000-03-01
2001-04-17
Manuel, George (Department: 3737)
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
For interpupillary distance measuring or lens positioning
C351S210000, C351S221000
Reexamination Certificate
active
06217172
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an ophthalmologic measuring system, and in particular to an ophthalmologic measuring instrument for determining changes over time of an eye under measurement in the state of natural vision, or for measuring changes of data such as interpupillary distance, ocular refractive power and pupil diameter of an eye under measurement and for displaying the data at real time, and also capable to display the data again after measurement.
In the past, no system has been proposed, which can continuously obtain data of ocular refractive power, interpupillary distance and pupil diameter before and after change of position of a target and can display the data in synchronization with the changes of an anterior ocular segment.
In recent years, there have been strong demands on a system, which can measure, continuously and at real time, the change of data such as ocular refractive powers, interpupillary distances and pupil diameters before and after the change of target position.
In Japanese Patent Application Heisei 10-54305, the present applicant has proposed an ophthalmologic measuring system, which is suitable for the purpose of obtaining data such as ocular refractive powers, interpupillary distances and pupil diameters before and after change of target position when position of the target is changed.
However, in the ophthalmologic measuring system described in the above patent application, there is no description on a system, which can obtain data such as ocular refractive powers, interpupillary distances and pupil diameters when the position of the target is changed and can display the data in synchronization with the changes of anterior ocular segment. In this respect, the system does not satisfy the requirements to measure the data of the anterior ocular segment continuously and at real time.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an ophthalmologic measuring system which can obtain data such as ocular refractive power, interpupillary distance and pupil diameter and data relating to anterior ocular segment at real time when position of the target is changed.
The ophthalmologic measuring system according to the present invention comprises a light source unit for emitting an illuminating light beam for illuminating a fundus of each of both eyes of a person under measurement, a projection optical system for projecting the illuminating light beam from the light source unit to the fundus of each of the eyes of the person under measurement, a photodetection optical system including a light blocking member which blocks a part of a reflection light beam coming from the fundus of an eye of the person under measurement and is arranged in an optical path and at approximately conjugate position to a pupil of the eye under measurement so that change occurs in light amount distribution depending on ocular refractive power, a photodetection unit arranged at approximately conjugate position to the pupil of the eye under measurement and receives photodetection light beam from the photodetection optical system, a storage unit for storing a photodetection signal of the photodetection unit, a control arithmetic unit for obtaining at least one of interpupillary distances, ocular refractive powers and pupil diameters of the eye under measurement based on the photodetection signal of the photodetection unit, and a display unit for displaying an anterior ocular segment image of the eye under measurement during measurement period and for displaying over time and at real time the data of interpupillary distance, ocular refractive power and pupil diameter of the eye under measurement, which are results of measurement during measurement period. The present invention provides an ophthalmologic measuring system as described above, wherein said system further comprises a target system for showing a target to the person under measurement by changing the target position from a first target position to a second target position different from said first target position in response to operation by a measuring person, wherein the control arithmetic unit determines at least one of interpupillary distances, ocular refractive powers and pupil diameters of the eye under measurement before and after change of the target positions based on the photodetection signals of the photodetection unit obtained before and after change of the target position by the target system. Further, the present invention provides an ophthalmologic measuring system as described above, wherein the system comprises a storage unit for storing an anterior ocular segment signal from the photodetection unit, and an anterior ocular segment image of the eye under measurement is displayed on the display unit with delay of time as required for arithmetic processing at the control arithmetic unit based on the signal stored in the storage unit, and the anterior ocular segment image when the target position is changed and results of the measurement are displayed at real time. Also, the present invention provides an ophthalmologic measuring system, which comprises a light source unit for emitting an illuminating light beam for illuminating a fundus of each of both eyes of a person under measurement, a projection optical system for projecting the illuminating light beam from the light source unit to fundus of each of the eyes of the person under measurement, a photodetection optical system including a light blocking member which blocks a part of the reflection light beam coming from fundus of each of the eye of the person under measurement and is arranged in an optical path and at approximately conjugate position to the pupil of the eye under measurement so that change occurs in light amount distribution depending on ocular refractive power, a photodetection unit arranged at approximately conjugate position to a pupil of the eye under measurement and receives photodetection light beam from the photodetection optical system, a storage unit for storing a photodetection signal of the photodetection unit, a target system for indicating a target to the person under measurement by changing target position from a first target position to a second target position different from the first target position, a control arithmetic unit for obtaining interpupillary distances, ocular refractive powers and pupil diameters of the eye under measurement before and after change of the target position based on the photodetection signals of the photodetection unit obtained before and after change of the target position by the target system, a storage unit for storing an anterior ocular segment signal of the photodetection unit and results of calculation by the control arithmetic unit in association with movement of the target by the target system, and a display unit for displaying an anterior ocular segment of the photodetection unit and the results of calculation by the control arithmetic unit in association with the movement of the target by the target system based on the anterior ocular segment signal stored in the storage unit and the results of the calculation. Further, the present invention provides an ophthalmologic measuring system as described above, wherein the display unit aligns and displays pupil images in association with the movement of the target by the target system so that movement of pupils of the eye under measurement on the photodetection unit can be sequentially identified. Also, the present invention provides an ophthalmologic measuring system as described above, wherein pupil images are partially overlapped each other or are displayed in different colors. Further, the present invention provides an ophthalmologic measuring system as described above, wherein the display unit is designed in such manner that movement of the target system can be visually identified.
REFERENCES:
patent: 5699194 (1997-12-01), Takahashi
patent: 5726807 (1998-03-01), Nakaoka et al.
patent: 5768024 (1998-06-01), Takahashi
Niimura Satoru
Shibutani Masahiro
Kabushiki Kaisha Topcon
Manuel George
Nields & Lemack
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