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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.
The UV rays from Sun will damage the retina by burning hole there. The lens in the eye focus the sun light into retina and burns a spot, so it is not safe to look at sun for too long a time. During total eclipse the sun is completely covered by Moon's disk. It is safe to look at that time. But the total eclipse lasts only few minutes and sun appears fast behind the Moon.