It is maybe not surprising then, that people in developing countries often have cataracts.
And many of them are children.
Take Bangladesh, for example.
This Asian country has over 800,000 blind people.
Research shows that 40,000 of these are children.
However, one international aid group is aiming to change this situation.
“Sightsavers” started in the 1950’s.
Since then, its members have been working in many countries across Africa, Asia and the Caribbean.
They aim to discover what makes people blind.
They do their best to develop treatments that will prevent blindness.
And, they also operate on people who have cataracts.
Members of “Sightsavers” work with local people on projects.
They train people to become health workers.
And they provide equipment for the treatment of eye disease.
"Sightsavers" wants local people to quickly become responsible for managing the work.
Then, “Sightsavers” can move somewhere else to start another project.
One of the “Sightsavers’” most successful projects is the “Bangladesh Childhood Cataract Campaign”.
The project manager, Doctor Alamgir Hossain, explains more about it:
“Our aim is to provide cataract operations for at least 10,000 children.
We need to find the children who are affected by cataract.
And we need to make sure that health workers take care of them after the operations.”