I am looking for a way to manufacture your own lens product in mass quantities with the help of most widely available machine park.
To do it , I selected cylinderical lenses because you can route it from the top with laser , jet or mill. I bumped to a technological problem is frosting of cut plastic. I think there might be a honing cnc machine to remove the frost from the plastic. If I cant overcome this , molding the acrylic in to shape is the only answer to problem.
Hand grinding spherical lenses are ULTRA dangerous and they cut your hand until the bone.