Vision is much more than simply seeing clearly.

It is the entire process whereby an individual understands what he or she sees. Here the word see is used in a broad context. Not only is vision the understanding of what is seen, but it is also the ability to direct one's own actions and motor activities accurately and efficiently with a minimum expenditure of effort and energy.

For example, in driving a car, vision is much more than reading the number plate clearly at the legally required distance: it is the total process whereby the spatial relationships between the cars, trucks and other objects around are taken in and processed by the driver to guide the car properly to its destination without an accident and with minimum stress on the driver. Vision judges the relative speeds of the other cars and alerts the driver to pedestrians, other cars, intersections and other hazards.

Vision is what directs the cricket player to swing the bat at exactly the right moment at exactly the right place in space to make contact with the ball. Vision is what is used by students to understand what they have read and to write things accurately on the line of a page.It has been said that the most complex thing in the known Universe is the brain and the most complex thing that the brain does is vision 87% of all learning is done through vision, 6% through hearing and 7% from the rest of the body. Vision is therefore the dominant process in the human species. Fortunately, it is also the most accessible to change through the use of behavioural vision care with lenses and vision training.