Patent EP0456166A1 successfully refreshed from Google Patents.
EP0456166A1
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Eye movement analysis system
Assignee: Yagi Toshiaki
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Filing: 1991-05-06
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Granted: —
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Expires: 2011-05-06
Abstract
Abstract An eye movement analysis system injects imaging light (6) to an eyeball (3) for a time duration ( o ) short enough so as not to create blurring. Image data is then recorded (20) onto a recording medium. The image data is then read out of the recording medium and used to calculate (22) positional data concerning the eyeball's present location. At a later time, image data of the eyeball is again recorded in the recording medium and read out to calculate positional data concerning the eyeball's new location. The two sets of positional data are used to calculate eye movement data for use in diagnosing the causes of vertigo and/or disequilibrium.
Inventors
- 👤 Shigeharu Yamanobe
- 👤 Norio C/O Nihon Kohden Co. Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 17:46
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/48; A61B5/4863; A61B3/00; A61B3/10; A61B3/113; G; G06; G06T; G06T7/00; G06T7/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
199 words
An eye movement analysis apparatus comprising: imaging means including an imaging camera and a light source for injecting imaging light to an eyeball to image eye movements through such a quick exposure as not to blur an imaging object; image recording means for recording imaged outputs produced from said imaging camera of said imaging means every single piece of image data; tracing destination specifying means for specifying the center of an eyeball and a position outside said center of said eyeball, said center of said eyeball and said position outside said center of eyeball being designations for tracing imaged outputs produced from said imaging camera or data read from said imaging recording means; position coordinate calculating means for calculating position coordinates of said center of said eyeball and said position outside said center of said eyeball specified by said tracing destination specifying means for each single piece of image data sequentially read from said image recording means; and eye movement calculating means for calculating an eye movement incorporating a torsional component from time-dependent changes in position coordinates of said center of said eyeball and said position outside said center of said eyeball obtained from said position coordinate calculating means.
Claim 2
Dependent Claim
56 words
An eye movement analysis apparatus as defined in claim 1, wherein polarizing plates are disposed in front of an optical lens of said imaging camera and in front of said light source to reduce influence of light reflected from the surface of said eyeball, said polarizing plates having polarizing angles which are different from each other.
Claim 3
Dependent Claim
43 words
An eye movement analysis apparatus as defined in claim 1, wherein polarizing plates are disposed in front of an optical lens of said imaging camera and in front of said light source and quarter-wave plates are disposed in front of said polarizing plates.
Claim 4
Dependent Claim
26 words
An eye movement analysis apparatus as defined in claims 1, 2, or 3, wherein a light-transmitting light-scattering member is disposed in front of said light source.
Claim 5
Dependent Claim
48 words
An eye movement analysis apparatus as defined in claims 1, 2, or 3 wherein said light source is oriented opposite to an eyeball; a light reflecting board is disposed so as to confront said light source; and a cylindrical light reflecting board is disposed around said light source.
Claim 6
Dependent Claim
43 words
An eye movement analysis apparatus as defined in claims 1, 2, or 3 wherein a light-emitting diode is used as said light source, and when lighting said light-emitting diode for a short duration to perform said quick exposure, said light-emitting diode is reverse-biased.
Claim 7
Dependent Claim
62 words
An eye movement analysis apparatus as defined in claims 1, 2, or 3 wherein a light-emitting diode is used as said light source, and when lighting said light-emitting diode for a short duration to perform said quick exposure, the anode of said light-emitting diode is grounded in synchronism with a falling edge of a light-emitting pulse signal supplied to said light-emitting diode.
Claim 8
Dependent Claim
83 words
An eye movement analysis method comprising the steps of: (a) injecting image light to an eyeball through such a quick exposure as not to blur an imaging object; (b) recording image data of said eyeball in a recording medium; (c) reading said image data out of said recording medium; (d) calculating positional data based on the output of said step (c); (e) repeating said steps (a) through (d); and (f) calculating eye movement data using the output of said steps (d) and (e).
Claim 9
Dependent Claim
61 words
An eye movement analysis method comprising the steps of: (a) injecting image light to an eyeball through such a quick exposure as not to blur an imaging object; (b) calculating positional data based on the output of said step (a); (c) repeating said steps (a) and (b); (d) calculating eye movement data using the output of said steps (b) and (c).
References Cited (Backward Citations)
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