For several days now, special observation glasses have been flying off the shelves in pharmacies and specialist shops in France. With demand constantly rising, some outlets are already out of stock, while others are placing repeated orders in an effort to satisfy customers.

"We were out of them for three days, but this morning we received a good supply for Wednesday evening," says pharmacy assistant Aurélie Letavi, speaking to AFP.

Demand is so high because these protective glasses are essential.

To watch the eclipse – the moment when the moon moves between the Earth and the sun – you absolutely must wear special glasses that comply with the ISO 12312-2 standard and are CE certified, which are vital to protect your eyes.

They are sold in pharmacies, at opticians and in certain specialist chains, priced between €1.50 and €4 each.