Are you sure it was not eye infection?

When my son was 8 yrs old, I thought it would be a good idea to introduce different flavor with the bedtime story. I got series of prophits stories in arabic from Bahrain. I picked the story of prophet Yousif (Josef), as it is exciting one. I came to the part in which (Yacob) Jacob keeps crying for the loss of Yousif till he became blind;

- So, crying too much causes blindness!
- Well, mmm...
- Are you sure it was not eye infection?

Well, for sure I will skip the story of Jonah (Yonis) in the stomach of the whale!

My Regards,
Haitham