Tired eye
Tired eye symptoms can occur when the sufferer has been concentrating on something for a long time, such as when reading or working at a computer, and have been blinking less often.
This means that the tear film is not being replaced often enough, and that some of the water contained in the film has evaporated from the surface of the eye. In some cases, the eyes start watering as the eye produces excess tear fluid to try and relieve the dryness.
Treatment
Obviously, the best way to avoid symptoms is to blink or close the eyes regularly, and to reduce the amount of time the eyes are looking at the same thing without a break (eye straining activity).
In many cases, such as in the work situation, simple avoidance techniques are not always possible, and the application of eyedrops, washes or ointments may provide temporary relief from symptoms.
In most cases, however, by replenishing the tear film appropiately, all of the symptoms of tired eye, including redness, should be relieved.