Abstract
Amblyopes suffers from interocular asynchrony due to an interocular delay which could either affect the amblyopic or the fellow eye. Most methods to measure this interocular delay can be used either on mild or strong amblyopes, but rarely on both. In this study, we adapted a paradigm recently developed by Burge and Cormack (2020), to measure the interocular delay on a large span of amblyopes. This method offers the advantage to be monocular, therefore allowing a measurement in a large range of amblyopes, regardless of whether they have binocular fusion. It is based on the concept of continuous psychophysics. The task of the subject is simply to track a moving bar on a computer screen with the computer mouse. Amblyopic and control participants were tested monocularly with each eye, as well as binocularly. The delay for each eye compared to the binocular delay could be measured at a millisecond level of precision. At the group level, we observed a delay in the processing time of the amblyopic eye. However, in some mild amblyopes, the delay was observed in their fellow eye. To conclude, we successfully applied this new tracking method to measure the interocular delay in the amblyopic population. This method is very promising as it can be used for a wide variety of participants and could therefore be applied to clinical conditions.