Eye Strain

Eye strain (asthenopia) describes the tired, aching, sometimes burning sensation that follows prolonged close focus, most commonly screen work. The mechanism is straightforward: blink rate drops by more than half while looking at screens, the tear film breaks up and the surface dries, while the ciliary muscle that focuses the lens works without rest. The result is discomfort, intermittent blur and frontal headache, but importantly not permanent damage to the eye. Uncorrected refractive error, an outdated prescription, glare, poor screen position and dry indoor air all amplify symptoms. Most cases respond to simple measures: regular distance breaks, blinking consciously, correct ergonomics, preservative-free lubricating drops if the surface is dry, and a current glasses prescription. Symptoms that persist despite these changes, or that come with double vision, pain or visual disturbances, warrant an eye examination.