US5565949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visual field perimetry on a small computer screen
Assignee: PERISTAT GROUP LLC
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Filing: 1995-07-10
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Granted: 1996-10-15
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Expires: 2015-07-10
Abstract
Abstract A moving and changing fixation point allows visual field perimetry to be performed on the small screen of a laptop computer. A moving fixation point increases the effective area of the screen. A changing fixation point maintains the attention of the user and provides a method of monitoring fixation.
Inventors
- 👤 John R. Kasha, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:10
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/024
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
199 words
A visual field perimeter which comprises a fixation point; a two-dimensional planar area with finite dimensions; means for fixating the eye with respect to said two-dimensional planar area; discrete targets placed momentarily on said two-dimensional planar area at locations calculated from predefined angles, the location of the eye with respect to said two-dimensional planar area, the dimensions of said two-dimensional planar area and the location of said fixation point; means for moving said fixation point in said two-dimensional planar area so as to maximize the said predefined angles that may be tested in said two-dimensional planar area wherein said predefined angles are angles between the discrete targets and the fixation point with respect to the eye; means for noticeably changing said fixation point so as to maintain the attention of the patient; input means operable by said patient so as to register whether or not said patient sees said noticeable change in said fixation point; input means operable by said patient so as to record whether or not said patient sees each of said discrete targets; and means for recording the relative locations of said discrete targets and whether or not said discrete targets were seen by said patient.
Claim 2
Dependent Claim
199 words
A visual field perimeter which comprises a fixation point; a two-dimensional planar area with finite dimensions; means for fixating the eye with respect to said two-dimensional planar area; discrete targets placed momentarily on said two-dimensional planar area at locations calculated from predefined angles, the location of the eye with respect to said two-dimensional planar area, the dimensions of said two-dimensional planar area and the location of said fixation point; means for moving said fixation point in said two-dimensional planar area so as to maximize the said predefined angles that may be tested in said two-dimensional planar area wherein said predefined angles are angles between the discrete targets and the fixation point with respect to the eye; means for noticeably changing said fixation point so as to maintain the attention of the patient; input means operable by said patient so as to register whether or not said patient sees said noticeable change in said fixation point; input means operable by said patient so as to record whether or not said patient sees each of said discrete targets; and means for recording the relative locations of said discrete targets and whether or not said discrete targets were seen by said patient.
Claim 3
Dependent Claim
23 words
A device according to claim 1 wherein an invisible bounding box delimits the area in which said fixation point is allowed to move.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-10-15 | 2000-04-15 | 2000-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-15 | 2004-04-15 | 2004-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-15 | 2008-04-15 | 2008-10-15 | $7700.00 | Window Closed / Lapsed |