Norrie Disease is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Norrie Disease, or a subtype of Norrie Disease, affects less than 200,000 people in the US population.
Ophanet, who are a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list Norrie Disease as a "rare disease". More information about Norrie Disease is available from Orphanet
The term 'prevalence' of Norrie Disease usually refers to the estimated population of people who are managing Norrie Disease at any given time. The term 'incidence' of Norrie Disease refers to the annual diagnosis rate, or the number of new cases of Norrie Disease diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.
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