The same encyclopedia says: “Advances in the prevention and the medical and surgical treatment of blindness can only be of benefit to a population that has access to medical care.
Sama entsüklopeedia ütleb: „Edusammud pimeduse ärahoidmise ja meditsiinilise ning kirurgilise ravi alal võivad tuua kasu vaid neile, kellele arstiabi on kättesaadav.