COMMUNICATIONS RETINAL CYSTS ANDRETINOSCHISIS* BY C. G. KEITH DepartmentofPathology, Institute ofOphthalmology, University ofLondon SINCE the term retinoschisis came into commonophthalmological parlance, it has oftenbeenusedas thoughthe conditionwereadefinite entity, differing fromretinal cysts bythe process byWhichit arose.
The definition of imperative is something that has authority or is absolutely necessary. 1  An example of imperative is the power that a government has over its people.  An example of imperative is the decision to give a cesarean in a breach birth.
Imperative mood is mood that signals directive modality, especially in commands. Its use may be extended to signal permission. An imperative verb is typically not inflected for most of the grammatical categories associated with verbs in a language, especially tense and person.mperative mood is mood that signals directive modality, especially in commands. Its use may be extended to signal permission. An imperative verb is typically not inflected for most of the grammatical categories associated with verbs in a language, especially tense and person.