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US 5,565,949 AGranted
Visual field perimetry on a small computer screen
OwnerJohn R. Kasha, Jr.inventor
Life of this patent
Estimating the term…
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.
Claims2
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.
5 more elements
Dependencies are inferred from the claim text.