In 2005, an estimated one billion people were affected by presbyopia globally. This rose to 1.8 billion by 2015, and experts predict a continued climb, peaking at around 2.1 billion in 2030, with the greatest burden in rural areas of low-resource countries (Fricke et al, 2018). Uncorrected presbyopia is considered to be the most common cause of visual impairment in the world (Holden et al, 2015).