Eclipse chasers across the United Kingdom are facing a shortage of specialized viewing glasses as the nation prepares for its most significant solar eclipse since 1999. The event, expected to see around 90% of the Sun obscured by the Moon, has triggered a last-minute scramble for equipment that ensures safe observation.

Health officials have stressed the critical importance of using certified eclipse glasses, warning that looking directly at the Sun, even for brief moments, can cause permanent eye damage. This advice has amplified demand for protective eyewear, leading to widespread stock depletion.

Retailers, from corner shops to official institutions, report unprecedented sales. One London bakery mentioned selling approximately 100 pairs of eclipse glasses in a single morning. Online marketplaces and even social media groups have become hubs for desperate buyers, though many listings now offer only expensive next-day delivery or cannot guarantee arrival before the eclipse.

The Royal Museums Greenwich, a recommended retailer by UK health authorities, has also sold out, citing an overwhelming volume of orders. This surge in demand has led to the emergence of eclipse glasses in unexpected retail locations as businesses attempt to capitalize on the situation.

Experts advise that the correct glasses must bear the international safety standard ISO 12312-2 and should be free from scratches or damage. The UK Health Security Agency (UKHSA) also recommends purchasing new glasses rather than reusing those from previous events, such as the 1999 eclipse, and exercising caution with online purchases.

To address the scarcity and potential for counterfeit products, a WhatsApp channel advertising available stock in local shops has gained thousands of followers. Similarly, online forums are directing users to marketplaces, sometimes for bulk purchases. The UKHSA cautions potential buyers to be wary of uncertified products, stating that if there is any doubt about certification, the glasses should not be used.

Initiatives like UKEclipse, established by UK astronomers, are warning the public about the prevalence of substandard and counterfeit glasses during major celestial events. They endorse purchasing from specialist retailers and reputable organizations. The American Astronomical Society (AAS) provides a list of manufacturers whose glasses have been laboratory-tested and confirmed to meet safety standards.

For those who have managed to secure a pair, the AAS suggests a pre-eclipse test: the glasses should render all but the brightest lights, like the faint reflection of the Sun off a shiny surface, completely invisible when worn indoors or outdoors on a sunny day. If they pass this visual check, they are likely safe for viewing the eclipse.