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US5212506A
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Analysis method of eyeball control system
Assignee: ATR AUDITORY AND VISUAL PERCEPRION RESEARCH LABORATORIES
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Filing: 1991-09-17
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Granted: 1993-05-18
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Expires: 2011-09-17
Abstract
Abstract Flicks in one or both of eyes are measured by a sensor (1) employing a limbus reflection method. An output of the sensor is applied to and digitized by an A/D converter (2). The digitized output is applied to a computer (3). The computer calculates flicks data of eyeballs, then calculates fractal dimension simultaneously or individually in a time-elapsed manner or for a definite time period, and quantifies characteristics of the eyeball control systems from the value of the fractal dimension or the time dependence of the fractal dimension.
Inventors
- 👤 Hiroshi Yoshimatsu
- 👤 Mitsuho Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:55
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/113
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
108 words
A method for analyzing small oscillations of an eye to enable quantifying said small oscillations, comprising the steps of: measuring small eye oscillations while an eye of a subject is looking at a target and providing output signals corresponding thereto, said small eye oscillations having small amplitudes; converting said output signals to digital signals; inputting said digital signals to a computer; calculating fractal dimension for said measured small eye oscillations using said digital signals; providing a quantity using said fractal dimension which corresponds to said small oscillations of the eye; and displaying the quantity on a display means, using said quantity to accurately model an eyeball control system.
Claim 2
Independent Claim
108 words
A method for analyzing small oscillations of an eye to enable quantifying said small oscillations, comprising the steps of: measuring small eye oscillations while an eye of a subject is looking at a target and providing output signals corresponding thereto, said small eye oscillations having small amplitudes; converting said output signals to digital signals; inputting said digital signals to a computer; calculating fractal dimension for said measured small eye oscillations using said digital signals; providing a quantity using said fractal dimension which corresponds to said small oscillations of the eye; and displaying the quantity on a display means, using said quantity to accurately model an eyeball control system.
Claim 3
Dependent Claim
19 words
The method according to claim 1, wherein providing output signals includes outputting said output signals as time-serial two-dimensional data.
Claim 4
Dependent Claim
26 words
The method according to claim 2, wherein said step of calculating fractal dimension includes setting dimension of phase space in accordance with said time-serial two-dimensional data.
Claim 5
Dependent Claim
27 words
The method according to claim 3, wherein said step of calculating fractal dimension further includes calculating correlation dimension in accordance with said set dimension of phase space.
Claim 6
Dependent Claim
24 words
The method according to claim 3, wherein said step of providing a quantity includes comparing said calculated fractal dimension with a predetermined standard value.
Claim 7
Dependent Claim
87 words
The method according to claim 1, wherein said eyeball control system includes a left eyeball control system and a right eyeball control system, said step of measuring small eye oscillations includes separately measuring small eye oscillations of left and right eyes, and said step of providing a quantity includes analyzing time dependence of the calculated fractal dimension with respect to said eyeball control system and said right eyeball control system at a time corresponding to the measured small eye oscillations of said left and right eyes, respectively.
Claim 8
Dependent Claim
28 words
The method according to claim 3, wherein said step of calculating fractal dimension further includes dividing the phase space into subspaces and calculating fractal dimension in each subspace.
References Cited (Backward Citations)
US5002384A
Cited
US4973149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-17 | 1996-11-16 | 1997-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-17 | 2000-11-16 | 2001-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-17 | 2004-11-16 | 2005-05-18 | $7700.00 | Window Closed / Lapsed |