visual impairment caused by other sight defects, such as night blindness or amblyopia, cannot be corrected. What is amblyopia? Amblyopia is a vision defect where the visual loss cannot be corrected by wearing [...] the best corrective glasses. It can be congenital. This also includes, for instance, strabismic amblyopia. When squinting, a different image is formed in each eye. In order for the brain to be able to see