Apparatus and method for assessing and improving the reliability of a visual field test
AssigneeIbisVision Limited
InventorBlair Donaldson
Life of this patent
Estimating the term…
Abstract
Apparatus for testing a patient's visual field, the apparatus comprising: means for recording the results of the patient's responses to one or more visual field targets (5) presented during a visual field test; and a fixation loss switch activatable by an observer observing the patient during the visual field test for identifying periods of fixation loss by the patient. The results recorded during periods of fixation loss are identified as being unreliable. Also disclosed is a method of testing a patient's visual field.
Claims16
Visual field testing apparatus for testing a patient's visual field, comprising
- a patient response switch for recording the results of the patient's responses to at least one visual field target presented to the patient during a visual field test;
- an observer monitor for displaying to a human observer a real time image of the patient's eye during the visual field test;
- a fixation loss switch for recording periods of fixation loss during the visual field test, wherein said fixation loss switch is activatable by the observer when the observer identifies periods of fixation loss by observing the real time image of the patient's eye during the visual field test;
- and
- a correlator connected with said patient response switch and with said fixation loss switch to correlate periods of fixation loss identified by the observer observing the real time image of the patient's eye during the visual field test with a time line representing the presentation of visual field targets during the visual field test to identify patient results during periods of fixation loss as unreliable.
A method of testing a patient's visual field, comprising the steps of
- recording the results of the patient's responses to at least one visual field target presented to the patient during a visual field test;
- displaying to a human observer a real time image of the patient's eye during the visual field test;
- providing a fixation loss switch for recording periods of fixation loss during the visual field test, wherein the fixation loss switch is activatable by the observer when the observer identifies periods of fixation loss by observing the real time image of the patient's eye during the visual field test;
- correlating periods of fixation loss identified by the observer observing the real time image of the patent's eye during the visual field test with a time line representing the presentation of visual field targets during the visual field test;
- and
- identifying results recorded during periods of fixation loss as being unreliable.
Dependencies are inferred from the claim text.