How dangerous is it to remove a congenital cataract?

Depends : It depends on the age of the patient. If its a child then it needs pediatric ophthalmologist who does cataract surgery. If its adult an experience cataract surgeon should be able to take care of it safely. Sometime depends on the kind of cataract, the surgery can be challenging but it could be done.

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. Every surgery has its risks & benefits. But the benefits of surgery outweigh risks as a lazy eye is permanent in most cases. More info at: eyedoc2020.Blogspot.