Extremely poor levels of hygiene in Sudan, coupled with a lack of health care facilities, medicines and trained personnel, are contributing to widespread preventable blindness. All the leading causes of preventable blindness, such as trachoma, river blindness, and cataracts co-exist in Sudan, Dr Serge Resnikoff, Coordinator of the World Health Organisation's (WHO) Prevention of Blindness and Deafness programme, told IRIN.