The statistics feature in the World Health Organization's first World Report on Vision, published ahead of World Sight Day.
Sightsavers is launching a three-year programme to provide quality eye care to rural populations in the Morogoro and Singida regions.
Broadcaster Fiona Phillips, TV doctor Dr Sara Kayat and celebrity make-up artist Ruby Hammer tried the simulator as part of a push to raise awareness about sight loss.
Mr Aahiswar is head teacher at Rangai Middle School in central India. He has been trained to screen students for vision problems so children can get the life-changing help they need.
The programme will take 10 trainees through a course of mentorship and practical work, to enable them to improve their skills and give them a taste of rural eye health work in India.
Robbie Peacock and Ciara Smullen travelled to the northern town of Mymensingh to visit a hospital that is saving the sight of thousands of people a year.