We depend on our senses to do things. Ideally, we should have full use of our five senses. We have the sense of taste, smell, hearing, touch, and sight.
The loss of one or more of these senses would pose some serious challenges in how we lead our lives. For instance, the loss of the sense of sight would be quite a considerable dilemma. Blind or visually impaired individuals would require assistance – at least, initially or when they are in new surroundings – so they are able to navigate, thrive, and be productive in a world where the majority of people are sighted.
According to the International Statistical Classification of Diseases and Related Health Problems – a diagnostic tool recognized worldwide – visual function has four levels. They are the following:
Level 1: Normal Vision
Level 2: Moderate Visual Impairment
Level 3: Severe Visual Impairment
Level 4: Blindness
The data presented by the World Health Organization shows that around 285 million people all over the world happen to be blind or classified as visually impaired.