His eyes darkened/ his eyes grew dim/ to be stunned/ to be overwhelmed with grief

He was overcome with great astonishment and grief. He was disappointed to see a terrible or grievous thing happen. He had "darkness in his eyes."

("Therefore our hearts were heavy upon those whose eyes were darkened. On Mount Zion, where the jackals walked in their wilderness" - Tehillim Seth 17, and so on: "And his eyes that see were darkened in their nakedness/ He looked still at other beautiful and fair women" - Yosef Ibn Zabara (12th century)/ The Tomb, and so on: "And how their eyes were darkened over the death of this white man" - Avraham Mapu/ Ait Tsavoua, 12, and Ken: "And she said to him: Arise, my son/ From tears his eyes are darkened" - Nathan Alterman/ Behold, they will die on a day of battle and its evening)

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