O noble Shaykh may Allah preserve you.
This man prays and looks towards the ma'kaan (place) of sujud (prostration), and
when he doesn't close his eyes (during the prayer) he loses 75% of his khushu'
(concentration), so what is your advice to this man may Allah preserve you?
Shaykh Saalih al - Fawzaan:
So he knows the levels of khushu' (concentration)?
What kind of talk is this?!
He can start by looking at the direction of sujud (prostration) like the 'ulama
(scholars) has mentioned, and that is enough. (1)
Al-khushu' (the concentration) is not by closing the eyes, but rather it is something
that Allah puts in the heart.
Shaykh Saalih al - Fawzaan (hafithahuAllaah)
Transcribed by Eesa ibn Roy
(slightly edited from original)
Source: Closing the Eyes
(1) Concerning Ru'koo:
Q: “Where does the one praying look during rukoo’ (bowing)?”
“He is not obliged to look at a certain spot like he should when he is standing and when he is sitting for the tashahhud: so when he is standing, he looks at the place of his prostration, and when he is sitting during the tashahhud, he looks at his (right index) finger. But during the rukoo’, there isn’t a specific spot toward which we were commanded to look, so the matter is unrestricted.”