Eye strain or weakness of vision, typically causing discomfort, fatigue, or difficulty focusing.
From Greek 'asthenos' (weak) + 'opia' (vision/eye condition), literally weak-sightedness or eye weakness.
Asthenopia was the Victorian diagnosis for the tired, aching eyes of factory workers and students—today we call it digital eye strain from screens, but the underlying problem of weak focusing muscles hasn't changed in centuries.
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