The brain is as important a factor in the way we see as is the eye. It is responsible for perceiving images correctly, for translating them into things we recognize, for understanding abstract representations such as print and pictures, and for many other processes which are necessary for a person to use the vision he/she has. When a portion of the brain is damaged, any aspect of visual processing controlled by that part of the brain can be damaged or lost. The result of this damage is that the affected person will be visually impaired in some way.
Sometimes this damage repairs itself, especially if the affected person is a young child. Other times, the damage can be overcome by using low vision devices, such as those used to help a person overcome a visual field loss caused by a stroke. In other cases, visual exercises can help a person who has experienced vision loss because of brain damage to learn to use his/her vision, such as in the case of cortical visual impairment.
The brain is a very complex organ, and understanding its role in vision is important for helping people who have lost vision because of brain injuries or damage which is a part of another condition.
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