The mind receives messages from sensory cells. The mind can focus on sensory signals from the eye. Eyes that have become strained do not always deliver a clear signal. Inattention to eye strain symptoms deprives the brain of meaningful signals.
The ever widening use of computers led to a marked increase in the reported cases of eyestrain. Still, too few computer users can identify the early symptoms of eyestrain. They stare daily at a lighted monitor, never noticing that their eyes have come under strain.
Too late, those computer users realize that they have developed severe eye problems. Too late they notice the effects of eye fatigue. Too late they begin to search for some type of remedy.