blindness

n. state of being unable to see; ignorance, unenlightened state

Blindness is the condition of lacking  visual perception due to physiological or neurological factors.Various scales have been developed to describe the extent of vision loss and define "blindness." Total blindness is the complete lack of form and light perception and is clinically recorded as "NLP," an abbreviation for "no light perception." Blindness is frequently used to describe severe visual impairment with vision. Those described as having only "light perception" can see no more than the ability to tell light from dark. A person with only "light projection" can tell the general direction of a light source.
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Blindness /blind·ness/ lack or loss of ability to see; lack of perception of visual stimuli. blue blindness , blue-yellow blindness popular names [more]Blindness - Community and Resources

Noun
1. lack of sight
(synonym) sightlessness, cecity
(hypernym) visual impairment, visual defect, vision defect, visual disorder
(hyponym) anopia

(n.)
State or condition of being blind, literally or figuratively.