Amblyopia - Amblyopia is a disorder of the visual system that is characterized by poor or indistinct vision in an eye.
https://en.wikipedia.org/wiki/Amblyopia
Amblyopia: MedlinePlus - Amblyopia is the loss of one eye's ability to see details. It is the most common cause of vision problems in children.
https://medlineplus.gov/ency/article/001014.htm
Lazy eye (amblyopia) - MayoClinic.com - A comprehensive overview covers symptoms and treatment of this childhood vision problem.
https://www.mayoclinic.org/diseases-conditions/lazy-eye/symptoms-causes/syc-20352391
