it is not the eyes that are blind but the hearts

For one who’s eyes are blind can reflect and benefit from the heart

أَفَلَمْ يَسِيرُوا فِي الْأَرْضِ فَتَكُونَ لَهُمْ قُلُوبٌ يَعْقِلُونَ بِهَا أَوْ آذَانٌ يَسْمَعُونَ بِهَا فَإِنَّهَا لَا تَعْمَى الْأَبْصَارُ وَلَٰكِن تَعْمَى الْقُلُوبُ الَّتِي فِي الصُّدُورِ

Have they not travelled throughout the land so their hearts may reason, and their ears may listen? For surely it is not the eyes that are blind but the hearts. — Quran 22:46

because the blindness of the eyes along with the heart is not harmful, Allah uses this metaphor in contrast to the opposite. For one who’s eyes are blind can reflect and benefit from the heart. Indeed, it is not the sight that becomes blind but the heart that becomes blind.

God knows best.

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Surah Al-Ikhlas in English