The Portuguese Society of Ophthalmology is urging anyone planning to watch the eclipse to use only certified solar viewing glasses. Looking directly at the Sun without the proper protection, even for a few seconds, can cause permanent eye damage.

The Portuguese Society of Ophthalmology is reminding the public that ordinary sunglasses are not suitable for watching a solar eclipse. Anyone planning to look directly at the Sun should use certified eclipse glasses, as failing to do so can cause permanent eye damage.

When buying eclipse glasses, it's worth taking a closer look at the label. They should meet the international ISO 12312-2 standard, carry the CE mark and clearly show the manufacturer's details. Experts also advise buying them from trusted sellers rather than unknown online shops, as fake eclipse glasses have become more common ahead of major eclipses.

Already have a pair from a previous eclipse? Check them carefully before using them again. If the lenses are scratched, torn or damaged in any way, it's better to replace them than take the risk.

The good news is that you don't need expensive equipment to enjoy the eclipse. As long as you have a certified pair of eclipse glasses and the weather cooperates, you'll be able to experience one of the year's most spectacular sights.

Across Portugal, many people are expected to head to beaches, viewpoints and open countryside to watch the eclipse, weather permitting. If you're planning to join them, it's worth arriving early, as popular viewing spots may become busy.

Experts also remind the public that eclipse glasses should only be removed during the brief period of totality—and only in locations where the Sun is completely covered by the Moon. In areas where only a partial eclipse will be visible, the glasses must remain on throughout the event.

The eclipse will only last a few minutes, but it's something many people will remember for years. Before you head outside to watch it, it's worth making sure you have the right glasses.