A man’s head was hit by some body also whereafter the man who was hit claimed that his eye sight had become weak thereby.
Hazrat Ali (A) examined his eye in the following way: He held an egg in his hand and asked the man to stand at some distance and say as to whether he could se the egg. When the man in question replied in the affirmative he made the man to get back to a certain further distance and again to a little more. Hazrat Ali (A) repeated this action till after the man said he could not see the egg. He also repeated this action keeping the egg in the circumferance of a horizontal line and marking the target in each case. He then measured the various distances in each case and found all the distances 1.e., right and left and up and down and announced that the claim of the man was correct otherwise, he said, there must have been a difference in the various distances measured by him.
He then repeated this action in respect of another man, who had hit the first man in question whose eye sight had become deffective as a result of his hit, to pay him penalty according to the difference of his eye sight as compared with the man whose eye sight was normal. (Wasael, vol. 3, p. 405, Mustadrik, vol. 3, p. 285 through Abu Turab (Urdu) by Allama Jazaeri vol. 2, p. 308).