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 improve vision. However, that said, I & many eyeMDs have patients who were told they had a lazy eye but ended up having significantly improved vision after cataract surgery or PPV/ vitrectomy. See eyedoc2020.Blogspot.com
I have had at least 20 patients in my career who surprised me and the residents with surprisingly good visual results after cataract surgery.