In 2010, WHO estimated that 153 million people worldwide were visually impaired due to uncorrected REs. Visual impairment can have immediate and long-term consequences in children and adults, such as lost educational and employment opportunities, and impaired quality of life. REs can simply be diagnosed, measured, and corrected with the aid of optical corrective approaches and devices such as spectacles and contact lenses or by refractive surgical procedures. Despite this, an estimated 670 million people worldwide do not have spectacles or adequate correction, including 517 million with near vision impairment and 153 million with distance vision impairment. Of 517 million people without spectacles for near vision correction, 410 million are deterred from performing near vision tasks and activities. Current data suggests that more than 90% of people with uncorrected REs worldwide reside in rural and low-income countries.