Experts are urging people to check carefully before buying solar eclipse glasses online, with counterfeiters and unscrupulous sellers accused of exploiting the last-minute rush. Celestron solar eclipse glasses on sale at the Royal Observatory Greenwich, south east London, ahead of the Solar eclipse on August 12, which will be the first total solar eclipse visible over mainland Europe since 1999. Anyone planning to look directly at the eclipse should use purpose-built solar eclipse glasses or viewers which meet the international ISO 12312-2 safety standard. The sun polarised through a pair of Celestron solar eclipse glasses at the Royal Observatory Greenwich (Image: Jordan Pettitt)Can you wear sunglasses during an eclipse? Fake eclipse glasses warningThe rush to buy eclipse glasses has also raised concerns about counterfeit and misleading products being sold online.