All the procedures were conducted with topical anaesthesia which had been brought from Germany. He reported on his experiences in 2011 in a video entitled, Ophthalmology Behind the Iron Curtain: Cataract Surgery in North Korea, saying that the economic conditions have led to improvisations - especially because of the absence of consumable medical devices but he commented that once a visiting surgeon adapts to these unique surroundings, he found that teaching and clinical work could be very effective and satisfying for both surgeon and patient.[21] As a consequence of this visit, in 2007 two young North Korean ophthalmic surgeons were permitted to visit Heidelberg and remain for six months, gaining extensive training in cataract surgery.