Lack of visual power. Blindness can be congenital, due to serious deficiencies in the embryonic and fetal development, or experience-as a result of various causes of morbidity (local trauma, trachoma, gonorrhea conjunctivitis of the newborn, corneal ulcers, corneal opacities, cherotomalacia from avitaminosis A, deep burns of cornea, cataract , glaucoma, retinal detachment), or lesions of the optic nerve (atrophy, degenerative or inflammatory and infectious or toxic, cancer) and optical centers of higher (or destructive tumors compressing the visual areas) .
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