Why should we use goggles in day time? Is it absolutely must to protect our eyes

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What do you know about the utility and importance of eye goggles? Do you feel it really protects our eyes? What type of goggles should we use (colour-wise, weight-wise, and design-wise)? What do you think (in general) about use of the goggles? Which brand of this have you been using or favouring? What should be seen while buying goggles?