The patient is given an eye test to find out how badly their vision is affected.
During the test, they're asked to read letters or symbols from a chart.
If they have refractive error, it can then be corrected with spectacles.
Sightsavers’ School Health Integrated Programming (SHIP) project, which ran throughout 2016, screened schoolchildren in Cambodia, Ethiopia, Ghana and Senegal for health problems such as poor vision. Teachers were trained to carry out basic eye tests and refer children for further treatment. During the project, 57,400 children were screened for eye problems and 1,000 were given spectacles.