Visual impairment refers to sight that has less quality, strength, or value than normal.
Sight becomes weakened or damaged in some way. Some people are born with visual impairments. Vision changes can also occur in people of any age for a number of reasons, including conditions within the eyes, as well as conditions within the brain. The change in a person's sight may be minor or severe. Vision problems can range from an inability to see certain colors to blurred vision or complete loss of sight.