NET
1 When Isaac was old and his eyes were so weak that he was almost blind, he called his older son Esau and said to him, “My son!” “Here I am!” Esau replied.
Darby
1 And it came to pass when Isaac had become old, and his eyes were dim so that he could not see, that he called Esau his elder son, and said to him, My son! And he said to him, Here am I.
KJV
1 And it came to pass, that when Isaac was old, and his eyes were dim, so that he could not see, he called Esau his eldest son, and said unto him, My son: and he said unto him, Behold, [here am] I.