Is a congenital cataract considered a disability?

Depends: It depends on what your vision is.

Very early...: ...Corrective surgery can produce near-normal vision while a delay can produce amblyopia and functional blindness.

Not necessarily: Not all congenital cataracts require surgery or are considered disability: depends on vision & field of vision, amblyopia/lazy eye, etc. More info: eyedoc2020.blogspot.com