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1. (WO2019001928) APPAREIL OPHTALMOLOGIQUE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

1. An ophthalmological apparatus for inspecting an eye, the apparatus comprising:

a light source;

a mask arranged to selectively block transmission of light from the light source to form a mask pattern that is projectable onto a subject's eye, wherein the mask is

adjustable based on a digital control signal to alter the mask pattern; and

an imaging device for viewing the mask pattern on the subj ect ' s eye .

2. An ophthalmological apparatus according to claim 1, wherein the mask comprises an array of independently

controllable masking elements, each masking element being adjustable, based on the digital control signal, between a transmissive state for transmitting light from the light source and an opaque state for blocking transmission of light from the light source.

3. An ophthalmological apparatus according to claim 2, wherein the array is mounted in a frame for locating in an optical path from the light source to the subject's eye.

4. An ophthalmological apparatus according to claim 2 or 3, wherein each independently controllable masking element is independent addressable.

5. An ophthalmological apparatus according to any one of claims 1 to 4 , wherein the mask comprises a liquid crystal display window.

6. An ophthalmological apparatus according to any preceding claim, wherein the 1ight source comprises a light-emitting portion from which light is projected out of the apparatus, and wherein a relative position of the light-emitting portion and the mask is controllable to permit adjustment of an angle of incidence of the mask pattern projectable onto the subject's eye .

7. An ophthalmological apparatus according to claim 6, wherein the light source includes an array of selectively activatable lighting elements, and wherein the relative position of the light-emitting portion and the mask is

controllable by selectively activating one or more of the lighting elements.

8. An ophthalmological apparatus according to claim 6, wherein the light source includes a lighting element and a secondary mask arranged to selectively block transmission of light from the lighting element, and wherein the relative position of the light-emitting portion and the mask is

controllable by adjusting a position of a light-transmitting region of the secondary mask relative to the lighting element.

9. An ophthalmological apparatus according to any one of claims 6 to 8 , wherein the secondary mask is controllable based on a second digital control signal .

10. An ophthalmological apparatus according to any preceding claim, wherein the light source is provided by lighting elements in the display of a tablet computer or smartphone .

11. An ophthalmological apparatus according to any preceding claim comprising a polariser arranged to polarise light from the light source.

12. An ophthalmological apparatus according to claim 11, wherein the polariser is provided in the mask and/or the light source .

13. An ophthalmological apparatus according to any preceding claim, wherein the imaging device includes :

an image sensor for capturing an digital image,

an optical line-up arranged to focus an image of the mask pattern that is formed on the subject's eye onto the image sensor, and

a display for displaying the captured digital image.

14. An ophthalmological apparatus according to claim 13, wherein the image sensor comprises a pair of independent image sensors disposed in a spaced relationship to enable

stereoscopic images to be detected.

15. An ophthalmological apparatus according to any preceding claim, wherein the imaging device includes a camera arranged to record an image of the mask pattern on the

subj ect ' s eye .

16. An ophthalmological apparatus according to any preceding claim, wherein the imaging device is disposed behind the mask relative to the direction in which the mask pattern is emitted therethrough, and wherein the mask includes an aperture to permit the imaging device to view the mask pattern on the subject's eye.

17. An ophthalmological apparatus according to any preceding claim, wherein the mask is contained within a first panel and the light source is contained within a second panel, the two panels being arranged such that they are substantially parallel .

18. An ophthalmological apparatus according to any preceding claim further comprising a controller configured generate the digital control signal.

19. An ophthalmological apparatus according to claim 18, wherein the controller includes a processor and memory storing software instructions, wherein, when executed by the

processor, the software instructions are arranged to control operation of the apparatus .

20. An ophthalmological apparatus according to claim or 19, wherein the controller is operably connected to the imaging device to control capture of an image of the mask pattern .

21. A modular unit for use as part of an

ophthalmological apparatus, the modular unit comprising:

a frame for locating adjacent a subject's eye, the frame comprising :

a mask mounted thereon;

a first mounting portion arranged to receive a light source on the opposite side of the mask from the subject's eye;

a second mounting portion arranged to receiving an imaging device,

wherein the mask is arranged to selectively block transmission of light from the light source to form a mask pattern that is projectable onto a subject's eye, wherein the mask is adjustable based on a digital control signal to permit adjustment of the mask pattern, and

wherein the second mounting portion is arranged to locate the imaging device in a position to view the mask pattern on the subject's eye.

22. A modular unit according to claim 21, wherein the mask is removably attached to the frame.

23. A modular unit according to claim 21 or 22, wherein the second mounting portion is arranged to receive a tablet computer or smartphone, wherein the tablet computer or

smartphone provides the light source and/or imaging device.

24. A method of viewing the surface of a subject's eye, the method including:

positioning a mask between the subject's eye and a light source ;

transmitting a digital control signal to the mask to selectively block transmission of light from the light source and thereby project a mask pattern onto the subject's eye; and viewing, by an imaging device, the mask pattern on the subj ect' s eye .

25. A method according to claim 24, wherein the light source comprises a light-emitting portion from which light is projected, and wherein the method includes controlling a relative position of the light-emitting portion and the mask to select or adjust an angle of incidence of the mask pattern projected onto the subject's eye.

26. A method according to claim 25 including:

moving the mask pattern across the subject's eye, and controlling the angle of incidence of the mask pattern as it is moved over the subject's eye so that it is substantially normal to a surface of the eye.

27. A method according to any one of claims 24 to 26, further including:

recording, by the imaging device, an image of the mask pattern on the subject's eye;

analysing the recorded image; and

based on the analysis of the recorded image, controlling one or more of the mask, light source and imaging device to adjust a measurement parameter.

28. A method according to any one of claims 24 to 27, further including:

projecting a mask pattern of known dimensions onto the subject's eye, the subject's eye being located at a known distance from the imaging device;

recording, using the imaging device, an image of the mask pattern on the subject's eye; and

analysing the recorded image, in order to calculate the shape of the subject's eye.

29. A method according to claim 28, further including: controlling the mask and the light source in order to sweep the light pattern across the subject's eye;

wherein the calculated shape of the subject's eye is used as an input parameter to control the sweep, such that an angle of incidence of the mask pattern on the patient' s eye is kept constant throughout the sweep.

30. A method according to any one of claims 24 to 29, further including:

recording, by the imaging device, a series of images of the mask pattern on the subject's eye; and

analysing the series of recorded images in order to determine tear film stability and/or lipid layer thickness in the subject's eye.