Notes and References. 1  U.S. Senate: Reference Home > Glossary > Christmas tree bill. 2  Lardner, George (1966) The Day Congress Played Santa: A Look at the Christmas Tree Bill, Washington Post, 25 December, p. A1, A10. 3  Shribman, David (1983) It Began as a Rather Ordinary Piece of Legislation, New York Times, 9 November, p. A22.
When the individual is awake, blinking of the eyelid causes rheum to be washed away with tears via the nasolacrimal duct. The absence of this action during sleep, however, results in a small amount of dry rheum accumulating in corners of the eye, most notably in children.
Age-related changes to the eye are the most common cause of eye floaters. The cornea and lens at the front of the eye focus light onto the retina at the back of the eye. As the light passes from the front of the eye to the back, it passes through the vitreous humor, a jelly-like substance inside your eyeball. Changes to the vitreous humor can lead to eye floaters. This is a common part of aging and is known as vitreous syneresis.