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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.
If you look at the sun long enough, that focused light will fry those cells, causing blindness. If you are very nearsighted or farsighted and not wearing corrective glasses, the light will not focus on the fovea so it will probably take longer to cause damage, but hey, these are your eyes. Don't stare at the sun.