Special jury instructions are usually meant to clarify a legal or factual issue that specifically relates to the evidence presented to the jury
In a jury trial, the judge will instruct the jury on applying the law to the facts. Standard jury instructions published by the state pertain to either a civil or criminal proceeding. There are also specially prepared jury instructions prepared by the trial lawyers, which the judge must approve.
Specially prepared jury instructions are customized to instruct a jury on some specific evidentiary matter or issue of law and which is intended to clarify or correct something of importance in the case.