Eye accommodation sensing for adaptive focus adjustment

Presbyopia is one of the biggest problem that affects more than one billion people worldwide. People between the age of 40 and 50 begin to suffer from Presbyopia which reduces their ability to focus near objects. To prevent people from wearing more than one pair of glasses or to wear and take off a single pair of glasses all the time, the aim of this project was the development of new glasses able to change the lenses focus.\\ In order to achieve this, in collaboration with the Imperial College Ophthalmology Research Group (ICORG), eyes convergence has been examined. This is a simultaneous, horizontal, inward movement of the eyes that occurs when someone is looking at a near object. Electro-Oculography (EOG) has been used to record eyes movements, using two electrodes attached on each eye canthi, and one on the forehead as reference. Eleven volunteers have been examined during a protocol where each of them had to switch the gaze from a far target to a near target and \textit{vice versa}. The experiment has been repeated changing the targets position. Two main waveforms have been identified: one for the switch from a far target to a near, and one for the switch from a near target to a far target. In the end, a correlation-based classifier has been developed to recognise what signals are related to a far to near, or near to far switch.