<unk>  <unk>  is a temporary condition resulting from focusing the eyes on a<unk>  display for protracted, uninterrupted periods of time. Some symptoms of<unk>  include headaches, blurred<unk> , neck pain, fatigue, eye strain, dry, irritated eyes, and difficulty refocusing the eyes.  These symptoms can be further aggravated by improper lighting conditions (ie. bright overhead lighting or glare) or air moving past the eyes (ie. overhead vents).<unk>  has not been proven to cause any permanent damage to the eye.
One may be able to mitigate the risk of<unk>  by adhering to the "20-20-20 rule": every 20  minutes, focus the eyes on an object 20  feet (6 meters) away for 20  seconds. Also, the use of over-the-counter artificial tear solutions and<unk>  glasses can reduce the effects of<unk> .[citation needed]
Computer vision syndrome
Cat eye syndrome
Central facial palsy
Oculomotor nerve palsy
Mind's eye
Cortical blindness
Color blindness
Snow blindness