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.
1 Declarative. 2  A declarative sentence makes a statement. 3  It is punctuated by a period. 4  Example: The dog in the neighborâs yard is barking. 5  Imperative. 6  An imperative sentence is a command or polite request. 7  It ends in a period or exclamation mark. 8  Examples: 9  Close the door.