A cataract operation can be life-changing.
After surgery lasting just a few minutes, someone who thought they would never see again can regain their sight - and their independence.
Ahmad was blind due to cataract in both eyes. Unable to work, he relied on his wife to support the family and became very frustrated.
Now, thanks to cataract operations on both eyes, he can see again.
"I am very happy now as I can see the world and do my job" 77-year-old Ahmad Ali, Bangladesh