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.
Lens problems. Cataracts are the most common problem with the lens that causes double vision. If cataracts are present in both eyes, images from both eyes will be distorted. Cataracts are often correctable with minor surgery. Muscle problems. If a muscle in one eye is weak, that eye can't move smoothly with the healthy eye. Gazing in directions controlled by the weak muscle causes double vision. Muscle problems can result from several causes: 1  Myasthenia gravis is an autoimmune illness that blocks the stimulation of muscles by nerves inside the head. 2  The earliest signs are often double vision and drooping eyelids, or ptosis. 3  Graves' disease is a thyroid condition that affects the muscles of the eyes.