SB 3.1.6
sri-suka uvaca
yada tu raja sva-sutan asadhun
pusnan na dharmena vinasta-drstih
bhratur yavisthasya sutan vibandhun
pravesya laksa-bhavane dadaha
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Sri Sukadeva Gosvami said: King Dhrtarastra became blind under the influence of impious desires to nourish his dishonest sons, and thus he set fire to the lacquer house to burn his fatherless nephews, the Pandavas.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Dhrtarastra was blind from birth, but his blindness in committing impious activities to support his dishonest sons was a greater blindness than his physical lack of eyesight. The physical lack of sight does not bar one from spiritual progress. But when one is blind spiritually, even though physically fit, that blindness is dangerously detrimental to the progressive path of human life.