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The sunlight can only cause permanent damage to your eyes if you are looking at the Sun directly during an eclipse. In the normal time when there is no eclipse, the bright rays of Sun are very strong that no one is able to look at the Sun directly to cause any damage. Transient eye damage can occur when one is not using protection like sun glasses when in snow, desert or huge water bodies. There is no known evidence to show damage to eyes from sunlight reflected from bumpers or wind shields
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You are right, the early morning and evening sun rays are mild. But still there is not enough exposure to UV rays during thses two times to damage the retina of eye.