In Oracle PL/SQL, SYSDATE is a pseudo column which always returns the operating system's current datetime value of DATE type. The format of the DATE output depends on the value of NLS_DATE_FORMAT initialization parameter. Note that: 1  The SYSDATE function requires no arguments.
Brain Conditions. Sudden double vision may be an indication of a serious medical condition. According to AllAboutVision.com, double vision may be caused by stroke, head injury, a brain tumor, brain swelling or an aneurysm. Ocular migraines may cause not only headaches but visual disturbances such as double vision.
If it damages the nerves that control your eyes, you may see double. Guillain-Barre syndrome is a nerve condition that causes progressive weakness. Sometimes, the first symptoms are in your eyes and include double vision. Diabetes can cause nerve damage to the muscles that move your eyes. That can lead to double vision.