AR Training in Adults With Unilateral Amblyopia

Overview

This is a single-center, non-randomized controlled trial to compare the effectiveness of binocular AR training with patching for the treatment of adults with unilateral amblyopia. Specific Aim 1 (Primary): To compare the improvement of visual acuity in the amblyopic eye between AR training and patching for the treatment of adults with unilateral amblyopia. Specific Aim 2 (Secondary): To compare the changes of visual functions and pathway selective neural activity in the early visual and cortex subcortical nuclei including the lateral geniculate nucleus between AR training and patching for the treatment of adults with unilateral amblyopia.

Patching the fellow eye (FE) is typically the first line of amblyopia therapy. Patching treatment has been thought to be effective only when started before the age of eight and might bring limited benifits for adults who have decreased visual cortex plasticity (Bhola et al., 2006). However, recent animal and human studies have demonstrated that visual cortex plasticity and visual functions can be enhanced later in life (Kind et al., 2002; Pineles et al., 2020), paving the way for new strategies for amblyopia treatment. Dichoptic/binocular digital therapy has been developed with hope to improve visual functions in amblyopia post the critical period. However, no widely accepted binocular treatments with superiority to patching is available in adults with unilateral amblyopia (Pineles et al., 2020; Oscar et al., 2023). Here, we designed an innovative binocular therapy using augmented reality (AR) training, based on neural deficits in amblyopia, in order to achieve better outcomes. Selective deficits were found in the parvocellular pathway (P pathway) compared to the magnocellular pathway (M pathway) in the monocular processing of visual information in the amblyopic eye (AE) (Wen et al., 2021). In addition to monocular deficits, imbalanced binocular suppression may also play important roles in the visual deficits of amblyopia as suggested by clinical evidence (DeSantis, 2014; Von Noorden, 1996) and psychophysical studies (Baker et al., 2008; Holopigian et al., 1988; Li et al., 2011; Zhou et al., 2013). Based on the neural deficits in unilateral amblyopia, we first apply the push-pull approach (Xu, He \& Ooi, 2010; Ooi et al., 2013), which was aimed to reduce sensory eye dominance in previous literatures, into the rebalance of functions of M and P pathways in the AE and the rebalance of binocular interaction, to improve the high spatial detail perception of the AE in daily life under binocular viewing condition, as well as binocular functions. Using AR technique combined with dichoptic device, images are processed differently and dichopticaly presented to each eye of the patients in real time, same in the content but different in contrast, spatial frequency, temporal frequency, and signal-to-noise ratio, allowing them to interact with the surrounding environment in real time during the visual training. We aim to achieve push-pull in monocular M-P pathways in the AE and interocular P-P pathways in the FE and the AE, in order to selectively improve the function of the P pathway in the AE under binocular viewing condition. The proposed trial will be conducted in one study sites in China. For the AR training group, patients need to perform AR training for 2 hours per day at home. For the patching group, patients need to patch the FE for 2 hours per day at home.