Safe glasses to watch Spain's total eclipse: where to get them for free

🇪🇸 Euronews (ES) —

AI Summary

Certified safe glasses are essential to view Spain's total eclipse without causing retinal damage. These special filters allow only 0.00032% of visible sunlight through, protecting the viewers of this rare astronomical event.

Only a specific certified filter lets just 0.00032% of visible sunlight through, protecting viewers of this once‑in‑a‑century event from lasting retinal damage.

World Travel Health total eclipse safe glasses Spain ocular safety sunlight filter astronomy event retinal protection

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