"Normal development of the visual cortex depends critically on early life visual experience. In humans, a disparity in the quality of vision between two eyes during infancy or early childhood leads to a visual impairment called amblyopia. In animal models, amblyopia can be induced early in life using a brief period of monocular deprivation via eyelid closure. Here we show in two evolutionarily divergent species that experimental amblyopia can be rapidly corrected if binocular visual experience is restored after temporarily silencing the retinas with a local anesthetic. These findings point the way to an approach for clinical management of amblyopia with advantages over the current standard of care."
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5150384/
If this is correct it's very, very exciting.