Improving readability of content displayed on a screen

A method of a device, of improving readability of content displayed to a viewer, the method comprising:

• obtaining a measurement of a displacement of the device,
• obtaining a measurement of a change in gaze of the viewer when gazing at a screen comprised in the device,
• determining that the change in gaze and the displacement of the device are out-of-sync by operations comprising
• deriving a phase difference between the measured change in gaze and the measured displacement of the device, and
• determining that the change in gaze and the displacement of the device are out-of-sync if the derived phase difference exceeds a threshold value, and
• in response to determining that the change in gaze and the displacement of the device are out-of-sync, adjusting the displayed content so as to improve the readability of the displayed content.

A computer program product comprising a non-transitory computer readable storage medium storing instructions that when executed by a processor of a device cause the device to perform operations comprising:

• obtaining a measurement of a displacement of the device,
• obtaining a measurement of a change in gaze of a viewer when gazing at a screen comprised in the device,
• determining that the change in gaze and the displacement of the device are out-of-sync by operations comprising
• deriving a phase difference between the measured change in gaze and the measured displacement of the device, and
• determining that the change in gaze and the displacement of the device are out-of-sync if the derived phase difference exceeds a threshold value, and
• in response to determining that the change in gaze and the displacement of the device are out-of-sync, adjusting the displayed content so as to improve the readability of the displayed content.