Essilor launched a global campaign on social media to raise awareness of the impact that vision has on people's quality of life in the month leading up to World Sight Day on Oct. 9. The campaign uses the #bettersightbetterlife hashtag. The French group said that an estimated 2.5 billion people worldwide see poorly and do not benefit from the existing solutions for correction, leading to a loss in productivity calculated to be worth as much as $1 billion per day. The social repercussions of visual impairment are also heavy, as 80 percent of what children learn is acquired through visual information processing, the company says, hence poor vision can affect their progress in school as well as the way in which they integrate into society.