Prevalence and Incidence of Retinoschisis, juvenile
Ophanet, who are a consortium of European partners,
currently defines a condition rare when if affects 1 person per 2,000.
They list Retinoschisis, juvenile as a "rare disease".
More information about Retinoschisis, juvenile is available from Orphanet
About prevalence and incidence statistics:
The term 'prevalence' of Retinoschisis, juvenile usually refers to the estimated population
of people who are managing Retinoschisis, juvenile at any given time.
The term 'incidence' of Retinoschisis, juvenile refers to the annual diagnosis rate,
or the number of new cases of Retinoschisis, juvenile 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.