When men do not see them, it is either because there are no angels present to be seen; or because their natural sight is holden that they may not see.
क) दृष्टि विहीनता, ख) न्यून दुष्टियुक्त, ग) पूर्ण दृष्टिविहीन्ः पूर्वरुपमा उज्यालो अँध्यारो छुट्याउन नसक्ने,