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.
a Brief Guide to. the Imperative in Latin. The Imperative has two forms, known as the First and the Second Imperative (also, but less accurately, as the Present and Future Imperative). The First Imperative has only the Second Person; the Second Imperative has both Second and Third Persons. The First Person is represented by the Subjunctive.