Most people don't think about the luxury of being able to see. I'm very, very nearsighted and have worn glasses or contacts since I was a little kid. Without them, I can barely see a foot in front of me. Everything blurs into abstract colors and shapes. I can't even see my kids' faces in the morning until I reach for my glasses. I can't imagine what my life would be like if I didn't have glasses, they are such an integral part of my everyday life.
In many places around the world, people are not fortunate to have access to glasses and opthalmic treatment. 285 million people across the globe are visually impaired but 80% of those people don't have to be– with glasses and proper treatment, their lives could be totally different. Blindness can be avoided in many cases by early intervention or even preventative treatments.