Treating amblyopia using altered reality enhances the fine-scale functional correlations in early visual areas

Area of Science:

• Neuroscience
• Ophthalmology
• Cognitive Science

Background:

• Amblyopia, a developmental visual disorder, causes significant visual deficits.
• Abnormal brain functional connectivity (FC) in visual cortex is linked to impaired vision in amblyopia.
• Limited research exists on FC improvements following vision restoration in amblyopes.

Purpose of the Study:

• To investigate if vision restoration through altered-reality adaptation training improves brain FC in adult amblyopes.
• To compare FC changes in amblyopes versus healthy controls after training.
• To assess the persistence of FC improvements post-training.

Main Methods:

• Resting-state functional magnetic resonance imaging (fMRI) was used to measure brain FC.
• Adult amblyopes and healthy controls underwent altered-reality adaptation training.
• Voxel-wise FC was analyzed before and after training, with follow-up assessments.

Main Results:

• Amblyopes showed weaker FC within and across early visual areas compared to controls before training.
• Following training, amblyopes exhibited improved visual acuity and enhanced FC.
• FC improvements in amblyopes were sustained for at least one month post-training.

Conclusions:

• Altered-reality adaptation training effectively improves vision in adult amblyopes.
• The training also enhances functional connectivity within and across visual cortex areas.
• Vision restoration treatments can lead to lasting improvements in brain function for amblyopia patients.