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biological

Judged: two independent readers; copy check clear.

blindness

blindness Blindness is the inability to see, or a loss or absence of awareness of visual input.

Blindness is the inability to see, or a loss or absence of awareness of visual input. It can result from disorders of the eyes, optic nerve, optic chiasm, or brain areas involved in vision, including the visual pathways and occipital lobe.