How to write summary?

Hi...

I have to write summaries for each lesson of my book and give it to teacher and get grade.

How can i write the best summary?

For example for this lesson:

'Sudden Fear'
(
David was blind. He had been handicapped ever since he could recall,but now all that was to be changed. He would be able to see. The doctor and the nurse stood by him; he could see them for the first time.
He lay in his bed starting at the ceiling,not daring to move because he was afraid that he might lose this wonderful new thing -this gift of sight. The doctor was speaking to the nurse,and David heard him say what a brave boy he had been,more courageous than anyone could have expected. His heart filled with pride as he heard the doctor's words.
The operation designed to give him his sight had been a very painful one,but David had not shown any fear either before the operation or while the doctor was doing it.Also,he had not been frightened by the world of sight that had opened out to him. He realized that he was not afraid because the nurse had been very kind and described what everything would be like.
"I think he will be all right now," he heard the doctor say." "I'll come and see him again tomorrow. Meanwhile,put him out in the sunshine for a while;it will entertain him and do him good."
The nurse put him in a wheelchair, well wrapped up, and wheeled him outside into the garden.
for a time he sat there looking at nothing in particular. Suddenly his heart seemed to stop beating with terror,and he sat,too frightened to move;then he rose up from his chair, his hands outstretched in defense, and his eyes fixed on something huge and black in front of him that danced at his feet. He cried out at the horror of it and fell down. The nurse ran out to him.
When the doctor called the next morning, she said, "So you see doctor,though David was not frightened of anything he saw after the operation, there was still something that scared him a lot, ant that was his own shadow! You know, I had forgotten to describe shadows to him."
)

Would you write a summary of this lesson for me so i could get help from it as a good example and write other summaries based on it ?
thanks.