Because it's an entirely different form of VR, in a sense. When you medically treat lazy eye through VR, you're not rendering it normally. You'd never experience this until you opt in to such a treatment.
Unless you are a licensed medical doctor, you shouldn't be giving this type of advice...ESPECIALLY if you haven't gone through the treatment either. You are talking as if you are a professional in the field.
Except I already said that this is a very newly discovered treatment that various optometrists do not know about. Doctors do not know everything in their field just because they are a doctor.