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1. WO2020221997 - VISUAL FIELD ASSESSMENT SYSTEM AND METHOD

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS

1 . A visual field assessment system (100) comprising:

a display device (1 16) having a display area;

a user input device (1 18), and

a processor (102, 104) configured to:

intermittently display a first visual stimulus (306) in a central display region (301 A) of the display area;

intermittently display a second visual stimulus (308) in a peripheral display region (301 B) of the display area;

determine whether the user has correctly visually detected the second visual stimulus based on use of the user input device, and

selectively display a graphical object (310) moving from the peripheral display region towards the central display region based on the determination.

2. A system according to claim 1 , wherein the processor (102, 104) is configured to determine that the user has correctly visually detected the second visual stimulus (308) if the user activated the user input device (1 18) within a time frame related to the intermittent display of the second visual stimulus following the display of the second visual stimulus, or within a predetermined time period after the second visual stimulus has disappeared/stopped being displayed.

3. A system according to claim 1 or 2, wherein the processor (102, 104) is configured to selectively display the graphical object (310) moving from the peripheral display region (301 B) towards the central display region (301 A) as an animated display.

4. A system according to claim 3, wherein the second visual stimulus (308) comprises intermittently displaying the graphical object (310) in the peripheral display region (301 B).

5. A system according to any preceding claim, wherein the processor (102, 104) is configured to intermittently display a plurality of the second visual stimuli (308) at different locations within the peripheral display region (301 B).

6. A system according to claim 5, wherein the processor (102, 104) is configured to:

determine that the user has correctly visually detected at least one of the plurality of second visual stimuli (308) based on use of the user input device (1 18);

intermittently display a first further one of the plurality of second visual stimuli at a first location within the peripheral display region (301 B);

determine whether the user has correctly visually detected the first further one of the plurality of second visual stimuli based on use of the user input device;

intermittently display a second further one of the plurality of second visual stimuli at a second location within the peripheral display region;

determine whether the user has correctly visually detected the second further one of the plurality of second visual stimuli based on use of the user input device, and

if the processor determines that the user has not correctly visually detected the first further one and the second further one of the plurality of second visual stimuli then the processor is configured to display a modified second visual stimulus (310).

7. A system according to claim 6, wherein the modified second visual stimulus (310) is visually different to the second visual stimulus (308), e.g. a different size.

8. A system according to claim 6 or 7, wherein the modified second visual stimulus (310) is displayed at the first location of the peripheral display region (301 B).

9. A system according to any of claims 6 to 8, wherein the processor (102, 104) is configured to determine whether the user has correctly visually detected the modified second visual stimulus (310) based on use of the user input device (1 18) and if the processor determines that the user has not correctly visually detected the modified second visual stimuli then the processor is configured to display the modified second visual stimuli moving from the peripheral display region (301 B) towards the central display region (301 A).

10. A system according to any of claims 6 to 9, wherein the processor (102, 104) is configured to subsequently re-display the second further one of the plurality of second visual stimuli (308) at the second location within the peripheral display region (301 B), and determine whether the user has correctly visually detected the second further one of the plurality of second visual stimuli based on use of the user input device (1 18).

1 1 . A system according to any preceding claim, further comprising an eye/gaze tracking device (1 19), wherein the processor (102, 104) is configured to use the eye/gaze tracking device to determine if a gaze of the user is directed at the central display region (301 A) during the intermittent display of the second visual stimulus (308).

12. A system according to any preceding claim, wherein the processor (102, 104) is configured to intermittently display a plurality of the first visual stimuli (306) at a plurality of different locations within the central display region (301 A).

13. A system according to any preceding claim, wherein the processor (102, 104) is configured to generate an output indicating a performance of the user in visually detecting at least the second visual stimuli (308).

14. A system according to claim 13, wherein the output comprises at least one of: a number of modified second visual stimuli (310) displayed; a number of modified second visual stimuli missed by the user; a number of first visual stimuli (306) missed.

15. A system according to any preceding claim, wherein the second visual stimulus (308) is displayed during a time window when the first visual stimulus (306) is not displayed, wherein the time window is adjusted during use, e.g. based on a user’s performance.

16. A system according to any preceding claim, wherein the processor (102, 104) is configured to provide a positive consequence if the user has correctly visually detected the first visual stimulus (306) and/or the second visual stimulus (308), and wherein the processor is configured to provide a negative consequence if the user has not correctly visually detected the first visual stimulus and/or the second visual stimulus.

17. A system according to any preceding claim, further comprising a panel (1 10) that, in use, is positioned/positionable between the user and at least one of the display device (1 16) and the user input device (1 18).

18. A system according to claim 17, wherein the panel (1 10) comprises a surface of a housing (202) containing at least one of the display device (1 16) and the user input device (1 18).

19. A system according to any preceding claim, wherein the processor (102, 104) is configured to generate a display in the central display region (301A) such that a gaze of the user is focussed/maintained on the central display region even whilst the second visual stimulus (308) is intermittently displayed in the peripheral display region (301 B).

20. A computer-implemented visual field assessment method comprising:

intermittently displaying a first visual stimulus in a central display region of a display area of a display device;

intermittently displaying a second visual stimulus in a peripheral display region of the display area;

determining whether a user has correctly visually detected the second visual stimulus based on use of a user input device, and

selectively displaying a graphical object moving from the peripheral display region towards the central display region based on the determination.

21 . A computer readable medium storing a computer program to operate a visual field assessment method according to claim 20.