Mishkat al-Masabih 16 Retaliation كتاب القصاص 50

وَعَنْهُ عَنْ أَبِيهِ عَنْ جَدِّهِ قَالَ: قَضَى رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي الْعَيْنِ الْقَائِمَةِ السَّادَّةِ لِمَكَانِهَا بِثُلْثِ الدِّيَةِ. رَوَاهُ أَبُو دَاوُد وَالنَّسَائِيّ

He said, on his father’s authority, that his grandfather told that God’s Messenger gave judgment that a third of the blood wit should be paid for loss of eyesight when the eye is not removed. Abu Dawud and Nasa’i transmitted it.