Asthenopia or eye strain is a condition that manifests itself through nonspecific symptoms such as fatigue, pain in or around the eyes, blurred vision, headache and occasional double vision. Symptoms often occur after reading, computer work, or other close activities that involve tedious visual tasks.
What causes eye strain?
Sometimes, eye strain can be due to specific visual problems, for example, uncorrected refraction errors or binocular vision problems such as accommodative insufficiency or heterophoria. It is often caused by the viewing of monitors such as those of computers or phones.
When concentrating on a visually intense task, such as continuously focusing on a book or computer monitor, the ciliary muscle tightens. This is commonly referred to as Computer Vision Syndrome (CVS) and can make the eyes irritated and uncomfortable. The level of discomfort tends to increase with the amount of reading or computer use. To alleviate this discomfort try to focus on a distant object at least once an hour to give your eyes a rest.
Listen to Clarkson Eyecare's own Dr. Brian Lojka discuss Computer Vision Syndrome.