Answered by Shaykh Faraz Rabbani
Question: Is one allowed to close their eyes during prayer for the sake of concentration?
Answer: I pray this finds you in the best of health and spirits.
It is permitted without dislike to pray with one’s eyes closed if it helps concentration. [Shurunbulali, Maraqi al-Falah] However, practice sometimes praying with your eyes open, looking down at your place of prayer, as this was the practice of the Prophet (Allah bless him and give him peace), and would be the better way if you can learn how to follow it while retaining concentration.
And Allah alone gives success.