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Although it is frequently claimed that the retina is burned by looking at the sun, retinal damage appears to occur primarily due to photochemical injury rather than thermal injury. The temperature rise from looking at the sun with a 3-mm pupil only causes a 4 Â°C increase in temperature, insufficient to photocoagulate.
It is also common to have tired eyes at the end of a long day, after many hours of concentration during which you must keep your eyes open. Staring at a computer, reading, scanning, watching â whatever your eyes do is a workout for the eye and eyelid muscles. Most of the time, tired eyes are simply a sign of muscle fatigue.