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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.
âVisible light (not UV radiation) causes pupil constriction, eyelid closure and squinting which can reduce penetration of the sunâs rays on a sunny day.â Jadrijevic continues by warning that, visible light is minimised on cloudy days but the exposure to harmful UV rays is still high.