For indeed it is not the eyes that are blind, but blind are the hearts within the breasts.
فإنها لا تعمى الأبصار ولكن تعمى القلوب التي في الصدور
Fe-innehâ lâ ta'me'l-ebsâru ve lâkin ta'me'l-kulûbü'lletî fi's-sudûr.
The Noble Qur'an, Surah al-Hajj 22:46.
The verse begins with a question: have they not traveled through the land, so that they might have hearts to reason with and ears to hear with?
It speaks of those who pass by ruined cities and abandoned wells and notice nothing.
The eye has looked; it has made out the stone and the well. The one who should take the lesson has not awakened.
This is why the Qur'an moves blindness from the eye to the breast.
The lightless eye of the Masnavi spoke of this same blindness: looking is one thing, discerning with the heart is another.