The problem of defining Cerebral Visual Impairment: The case for Cerebral Visual Disorders

I have just returned from two very interesting international conferences the first of these was the Vision 2017, the 12th International Conference by the International Society for Low Vision Research and Rehabilitation (ISLRR) in The Hague, Netherlands, and the second was the 9th ICEVI Europe 2017, Bruges, Belgium. At both of these conferences were papers around and specifically on the topic of cerebral visual impairment. However, what I did notice in almost every paper (not all but nearly all including my own!), no one defined exactly what cerebral visual impairment is. Some papers went into quite specific medical examinations of patients with CVI whilst other papers were about developing screening or assessments of people with CVI. All of which I found very interesting but I could not but help in thinking that how can we develop assessments of CVI if we cannot define CVI?