Uncorrected refractive errors lead to vision that is out of focus. Different types of refractive errors effect people in different ways, and for the absolute majority these can be corrected with a simple pair of glasses.

There are several useful papers that explain the existing challenges and trends to look out for. Start with this one: The uncorrected refractive error challenge.

Now, learn about Myopia: a growing global problem with sight-threatening complications.

After reading these articles, take a look at this paper for some ideas about how eye health can be improved for people throughout the world: Improving access to refractive and eye health.

Finally, find out about the differences in eye issues between males and females: Gender differences in presbyopia.