The prevalence of selected ocular diseases and conditions.

It is useful for a clinician to know how common or rare a given ocular disease or condition is. Knowledge of a condition's prevalence provides a rough indication of how often to expect to encounter it in a clinical setting. Furthermore, knowledge of a condition's prevalence can assist in planning the health service requirements necessary to treat it. The acquisition of prevalence data from the literature, however, can be difficult and time-consuming because of the wide range of journals that have published relevant information. This article is a complication of some of the available data from the literature regarding the prevalence of many ocular diseases and conditions. It also includes a few systemic diseases with ocular involvement.