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.
Symptoms of double vision. Double vision is seeing two images of a single object. It's sometimes confused with blurred vision. If you have blurred vision, a single unclear image will appear. If you have double vision, you'll see two images at the same time. Double vision may be constant, it may come and go, or it may only occur when you're looking in a particular direction. A weakness in the muscles on either side of your eyeball can cause horizontal double vision, where you see two images side by side while looking to the left or right. It can also cause your eyes to appear crossed, or as if they are wandering.