Computer-based 3D visual field test system and analysis
AssigneeCalifornia Institute of Technology
InventorsWolfgang Fink, Alfredo A. Sadun
Life of this patent
Estimating the term…
Abstract
A method and apparatus for electronically performing a visual field test for a patient. A visual field test pattern is displayed to the patient on an electronic display device and the patient's responses to the visual field test pattern are recorded. A visual field representation is generated from the patient's responses. The visual field representation is then used as an input into a variety of diagnostic processes. In one embodiment of the invention, a series of visual test patterns of varying contrast are presented to a patient in order to construct a three-dimensional visual field representation wherein contrast sensitivity is plotted against a Z-axis.
Claims29
A method of measuring a patient's visual field, comprising:
- presenting a visual field test pattern at a preselected contrast level to the patient using an electronic display device;
- receiving a patient response signal;
- and
- generating a three-dimensional graphical representation of the visual field using the patient response signal and the preselected contrast level.
A method of measuring a patient's visual field, comprising:
- repeating steps a and b for a plurality of selected contrast levels and a plurality of corresponding patient response signals:
- a) presenting an Amsler visual field test pattern at a selected contrast level to the patient using an electronic display device;
- b) receiving corresponding patient response signals from a patient input device operated by the patient;
- generating a three-dimensional graphical visual field representation using the plurality of selected contrast levels and the plurality of corresponding patient response signals.
An apparatus for measuring a patient's visual field, comprising:
- an electronic visual field test pattern display device;
- a patient response input device;
- a visual field tester operably coupled to the visual field test pattern display device and the patient response input device;
- and
- a three-dimensional graphical visual field representation generator operably coupled to the visual field tester.
A method of measuring a patient's visual field, comprising:
- presenting a visual field test pattern at a preselected contrast level to the patient using an electronic display device, the visual field test pattern having a grid of substantially orthogonal lines spaced apart at least 1.5 arc minutes of the patient's visual field;
- receiving a patient response signal;
- and
- generating a visual field representation using the patient response signal and the preselected contrast level.
A method of measuring a patient's visual field, comprising:
- presenting a visual field test pattern at a preselected contrast level to the patient using an electronic display device;
- receiving a patient response signal;
- and
- generating a statistical description of the patient's visual field using the patient response signal and the preselected contrast level, the statistical description including a ratio between the loss of contrast sensitivity over degrees of visual field taken perpendicularly to a steepest slope of visual field loss.
A method of measuring a patient's visual field, comprising:
- presenting a visual field test pattern at a preselected contrast level to the patient using an electronic display device;
- receiving a patient response signal;
- and
- generating a statistical description of the patient's visual field using the patient response signal and the preselected contrast level, the statistical description including a square root of a ratio of an area of the visual field defect at a highest measured contrast sensitivity versus an area of the visual field defect at a lowest measured contrast sensitivity.
An apparatus for measuring a patient's visual field, comprising:
- an electronic visual field test pattern display device, the visual field test pattern having a grid of substantially orthogonal lines spaced apart at least 1.5 arc minutes of the patient's visual field;
- a patient response input device;
- a visual field tester operably coupled to the visual field test pattern display device and the patient response input device;
- and
- a visual field representation generator operably coupled to the visual field tester.
An apparatus for measuring a patient's visual field, comprising:
- an electronic visual field test pattern display device;
- a patient response input device;
- a visual field tester operably coupled to the visual field test pattern display device and the patient response input device;
- and
- a statistical description generator operably coupled to the visual field tester wherein a generated statistical description of the visual field includes a ratio between the loss of contrast sensitivity over degrees of visual field taken perpendicularly to a steepest slope of visual field loss.
An apparatus for measuring a patient's visual field, comprising:
- an electronic visual field test pattern display device;
- a patient response input device;
- a visual field tester operably coupled to the visual field test pattern display device and the patient response input device;
- and
- a statistical description generator operably coupled to the visual field tester wherein a generated statistical description of the visual field includes a ratio of an area of the visual field defect at a highest measured contrast sensitivity versus an area of the visual field defect at a lowest measured contrast sensitivity.
An apparatus for measuring a patient's visual field, comprising:
- an electronic visual field test pattern display device;
- a patient response input device;
- a visual field tester operably coupled to the visual field test pattern display device and the patient response input device;
- a visual field representation generator operably coupled to the visual field tester;
- a patient response database for storing a time series of patient response signals received from a patient using the patient input device;
- and
- a patient response history generator for monitoring the visual field in the patient using the time series of patient response signals.
An apparatus for measuring a patient's visual field, comprising:
- an electronic visual field test pattern display device;
- a patient response input device;
- a visual field tester operably coupled to the visual field test pattern display device and the patient response input device;
- a visual field representation generator operably coupled to the visual field tester;
- a patient response database for storing a set of of patient response signals received from patients using a patient input device;
- and
- a diagnostics generator for comparing a patient response signal to the set of patient response signals to determine the cause of the patient's visual field defects.
An apparatus for measuring a patient's visual field, comprising:
- an electronic visual field test pattern display device;
- a patient response input device including a touch sensitive screen;
- a visual field tester operably coupled to the visual field test pattern display device and the patient response input device;
- and
- a visual field representation generator operably coupled to the visual field tester.
An apparatus for measuring a patient's visual field, comprising:
- an electronic visual field test pattern display device;
- a patient response input device including a touch sensitive screen;
- a visual field tester operably coupled to the electronic display device and the patient response input device through a communications network;
- and
- a visual field representation generator operably coupled to the visual field tester.
Dependencies are inferred from the claim text.