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.
El Imperativo/ Imperative Form. The imperative form is used to give an order, direction, or command. REGULAR VERBS. To form the command, drop the -o of the first person present form (indicative mode) of the verb and add the following endings: Verbs ending in -ar, such as cobrar/ to collect money: Positive Imperative.