Riddoch Syndrome is a rare condition that affects a person's vision. It is caused by damage to a part of the brain called the occipital lobe. This part of the brain is responsible for interpreting what the eyes see. People with Riddoch Syndrome can see, but they have trouble understanding or recognizing objects that they see. For example, if someone with Riddoch Syndrome was handed a ball, they may not be able to recognize that it is a ball, even though they could see it clearly. It's as if the part of their brain that is needed for understanding what the eyes see is not working properly.