Astronomers have revealed photographs of glasses from 1927 used to view eclipses, ahead of the best solar eclipse in decades this evening. Planetarium Astronomer Dr Carys Herbert demonstrates wearing Celestron solar eclipse glasses at the Royal Observatory Greenwich. / Credit: PAThe looming eclipse has seen people travel for miles to get their hands on a pair of eclipse glasses ahead of the event on Wednesday evening. Experts have warned that only special solar eclipse glasses that are ISO 12312-2 certified for the safest eye protection should be used to view the eclipse. Following the 1999 total solar eclipse, the Royal College of Ophthalmologists reported around 70 cases of people experiencing vision problems after watching the eclipse.