ESA reserve astronaut Sara García Alonso is urging the public to use certified eclipse glasses for the total solar eclipse on Aug. 12, 2026 [1].
Using improper eyewear during a solar event can lead to irreversible blindness. Because the sun emits intense radiation, standard protective gear is often insufficient to shield the human eye from permanent injury.
Viewing spots are expected to be crowded across the United Kingdom, with high interest in London [2]. However, García Alonso said that ordinary sunglasses do not provide the necessary filtration to keep viewers safe [3]. Looking directly at the sun without specialized protection can cause permanent retinal damage [3].
To ensure safety, experts recommend using ISO-certified solar eclipse glasses, or equivalent certified filters [4]. These specialized lenses are designed to block the vast majority of harmful rays, whereas standard sunglasses only dim the light without filtering the dangerous radiation [3].
Observers should verify that their equipment meets international safety standards before the event [4]. If glasses are scratched or punctured, they should be discarded immediately to avoid exposure to concentrated sunlight.
This guidance comes as millions prepare to witness the celestial event across Europe. The total solar eclipse on Aug. 12, 2026 [1] provides a rare opportunity for observation, but only if safety protocols are strictly followed to prevent a public health crisis involving eye injuries [3].
“Ordinary sunglasses do not provide the necessary filtration to keep viewers safe.”
The emphasis on ISO-certified equipment highlights a recurring public health risk where consumers mistake 'dark' lenses for 'protective' lenses. Because the 2026 eclipse is visible across high-population areas like London, the potential for widespread retinal injury is high without a coordinated educational campaign on the difference between fashion sunglasses and solar filters.
