What does one do if he cannot bow or prostrate?

Question:
The questioner who sent his question before the program says: Honorable Shaykh, a man had surgery on his eye, and the doctor told him that for a certain period he must not bow or prostrate as usual, but rather nod his head in bowing and prostration while sitting. What is the ruling on that?

Answer:
Yes, he acts on the doctor’s opinion because this is in his interest and part of his treatment. He prays standing if he is able, and if he is not able, he prays sitting and nods his head for bowing and prostration, making his nod for prostration lower than his nod for bowing. Allah the Exalted says: Yes.