HEAD MOUNTABLE DEVICE FOR MEASURING EYE MOVEMENT HAVING VISIBLE PROJECTION MEANS

1 . A head mountable device for measuring eye movement of a user, the head mountable device comprising:

a frame;

a camera system comprising a first camera, wherein the camera system is configured to obtain a first set of images of a first eye of the user; and

a projection system for projecting a first projection comprising a visible object in a field of view of the first eye when the user wears the head mountable device, wherein the projection system is configured to move the visible object relative to the head mountable device.

2 . The head mountable device according to claim 1 , wherein the projection system comprises a first projector, and a first motor configured to move the visible object by changing a first projection direction of the first projector.

3 . The head mountable device according to claim 1 , wherein the projection system comprises a projection mirror configured to reflect the first projection.

4 . The head mountable device according to claim 1 , wherein the projection system is configured to move the visible object by providing a sequence of projections including the first projection.

5 . The head mountable device according to claim 1 , wherein the first projection comprises an image.

6 . The head mountable device according to claim 1 , wherein the first projection is a dot having a diameter of more than 0.5 cm.

7 . The head mountable device according to claim 1 , wherein the camera system is configured to obtain a second set of images of a second eye of the user.

8 . The head mountable device according to claim 7 , wherein the camera system comprises a second camera configured to obtain the second set of images.

9 . The head mountable device according to claim 1 , wherein the projection system is further configured for projecting a second projection in a field of view of the second eye when the user wears the head mountable device.

10 . The head mountable device according to claim 1 , wherein the first camera is configured to obtain the first set of images with a first frame rate, and wherein the first frame rate is selected such as to enable detection of eye saccades of the first eye.

11 . The head mountable device according to claim 1 , further comprising a first processing unit configured to process the first set of images, and to provide a processing unit output based on the first set of images.

12 . The head mountable device according to claim 1 , further comprising a second processing unit configured to control the projection system to move the visible object relative to the head mountable device.

13 . The head mountable device according to claim 1 , further comprising an interface for providing a device output based on the first set of images.

14 . The head mountable device according to claim 13 , wherein the interface comprises one or more of a display, a speaker, and a wireless transmitter unit.

15 . The head mountable device according to claim 1 , wherein the head mountable device comprises a first motion sensor configured to detect a movement of the head mountable device.

16 . The head mountable device according to claim 1 , wherein the projection system comprises a laser pointer and/or a video projector.

17 . The head mountable device according to claim 1 , wherein the projection system comprises an optical lens configured for changing a shape of the visible object.

18 . A method for measuring eye movement of a user wearing a head mountable device comprising a frame, a camera system comprising a first camera, and a projection system comprising a first projector, the method comprising:

obtaining a first set of images of a first eye of the user by the camera system;

projecting a first projection comprising a visible object in a field of view of the first eye by the projection system; and

moving the visible object relative to the head mountable device by the projection system.