Please tell me, could the removal of a congenital cataract in an adult help improve their vision?

Maybe: Depends upon the intensity of the cataract and whether you had normal vision at the time of full development of vision around age 8 years. If the visual potential is good and the cataract obstructs, then improved vision is likely. Otherwise be prepared for something less than perfect.

Congential Cataract: Congential Cataract can cause amblyopia/lazy eye: occurs when eye does not have visual input to the brain for the connection to develop. If told have severe amblyopia, it is unlikely for a cataract surgery to give 20/20. Pts who were told they had a lazy eye can have significantly improved VA after cataract surgery. See eyedoc2020.Blogspot.