Total blindness is the inability to tell light from dark, or the total inability to see. Visual impairment or low vision is a severe reduction in vision that can't be corrected with standard glasses or contact lenses and reduces a person's ability to...

The inability to see, caused by damage to the eye or to parts of the VISUAL SYSTEM. It has been defined as a condition in which VISUAL ACUITY is 20/200 (see 6/6 NOTATION); or if the VISUAL FIELD subtends a visual angle of 20° or less. See also:...

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."[1] Total blindness is the complete lack of form and...

EMPEDOCLES, a Greek philosopher of the fifth century BC, described how the goddess Aphrodite blended earth, air, fire and water and sealed them with rivets of love to form the sphere of a human eye. Lit with divine fire, the eye shone out...

The information age is so dazzling that it is blinding. One sign is the runup of high-tech stocks involving the Internet; almost anything with a dot-com attached seems to have become a kind of Midas gold. Initial public offerings of startup company stock...