Why is it when one looks at the sun or direct light for long the eyes tend to seem blury?

Question: Why is it when one looks at the sun or direct light for long the eyes tend to seem blury?

Asked by 256bmay33 to Ann, David, Doris, Grace, Jonathan, Peter on 2 Jun 2019.
- Grace Kago answered on 2 Jun 2019:
  
  because our eyes are very sensitive, and are susceptible to over-stimulation by the intense rays of the sun. We have to protect them and treat them kindly by wearing hats, sunglasses, and not staring directly into the sun!!

Question: Why is it when one looks at the sun or direct light for long the eyes tend to seem blury?