There are many causes, or suspected causes of dry eye syndrome. A surprising one is diet – in particular, omega-3s.
Scientists have found that blinking may be linked to how we pay attention, rather than simply a mechanism to lubricate the eyes.
If you stare at a dim light bulb without moving your eyes for about ten seconds, and then look at a blank wall or ceiling, you will likely see an afterimage of the light. Your brain may be playing tricks on your eyes.