It has been stated in Rigved Mandal 10 Sukt 161 Mantra 5

It has been stated in Rigved Mandal 10 Sukt 161 Mantra 5 that - O reborn living being! Continue to do my bhakti. Even if you will lose your eyesight, I will make your eyes healthy. I will meet you too, that is, you will attain me as well.

Book - way of living
Author - Sant Rampal Ji Maharaj