﴿ ثُمَّ لَتَرَوُنَّهَا عَيْنَ ٱلْيَقِينِ ﴾

“In the end you will indeed, most surely, behold it with the eye of certainty:”

Again you will surely see it — repeated for emphasis — with the eye of certainty ‘ayna is a verbal noun as both ra’ā and ‘āyana have the same meaning.