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A considerable proportion of the vision loss burden was listed as ‘residual causes’. This ‘other’ category includes causes for which we have limited data, such as:
This limited data is caused by surveys not recording a cause for each reported case of vision loss, and the limited list of causes given in published materials.
However, some data are available. With trachoma, for example, WHO report the number of people at risk of trachoma has declined from 1.5 billion in 2002 to 136.9 million in 2020 – a 91% reduction.
Adelson, J., Bourne, R., Briant, P., Flaxman, S., Taylor, H., Jonas, J., Abdoli, A., Abrha, W., Abualhasan, A., Abu-Gharbieh, E. and Adal, T. (2020). Causes of blindness and vision impairment in 2020 and trends over 30 years, and prevalence of avoidable blindness in relation to VISION 2020: the Right to Sight: an analysis for the Global Burden of Disease Study. Lancet Global Health.