Dynamic Retroversion of Strabismus.

Abstract

Strabismus is a medical term used to define eye misalignment conditions that prevent both eyes from focusing on the same target simultaneously. Apart from having an aesthetic impact on the subject, strabismus is a dis- ability that prohibits the correct perception of depth. The purpose of going through treatment is to realign the “bad" (strabismic) eye, so that it fixates on the same target as the “good" (dominant) eye. This research presents a novel system called Dynamic Eye Misalignment Retroversion System (DEMRS), that can dynamically adjust the light rays coming into each eye, such that both foveae are stimulated by the same target, simultaneously. To test the system, a simulated implementation was created using a set of strabismus cases for known targets. The simulated results show, that the system is able to re-align both light rays such that they intersect the target successfully. Fur- thermore, a research prototype was built to assess the efficacy of the DEMRS in the successful fusion of the stimuli coming into each eye, from the correct target, simultaneously. The clinical evaluation experiments were conducted under lab conditions, using subjects with normal vision and strabismus, be- tween the ages of 8 and 98 years. Overall, 21 subjects underwent clinical evaluation and, in each experiment, the fusion success of both stimuli at near and far targets was recorded. The results indicate that the DEMRS is able to restore successfully the correct perception of depth, through binocu- lar vision, for young children, adults and elders.