Eclipse Glasses UK: Watch the 12 August Eclipse Safely

Why eclipse glasses are suddenly in demand

Search interest in eclipse glasses, eclipse timings and safe viewing methods has surged across Britain in the 48 hours before Wednesday's event, and with good reason. The solar eclipse of 12 August 2026 is the deepest visible from Britain since August 1999, with the Moon obscuring up to 95% of the Sun over parts of the country during the early evening. The path of totality itself crosses Iceland and northern Spain, so nowhere in the UK will experience full darkness, and that partial status is precisely what makes eye safety critical. During a partial eclipse the visible sliver of the Sun remains intensely bright, bright enough to burn the retina without any sensation of pain, because the retina has no pain receptors. Solar retinopathy, the damage caused by looking at the Sun, is frequently permanent and there is no treatment. The instinct to glance up as the light dims is strong, and the dimming itself misleads people into believing the Sun has become safe to view. It has not. At 95% obscuration the remaining 5% of the solar disc still emits enough visible light and infrared radiation to cause injury within seconds.

The ISO 12312-2 standard and how to check your glasses

The only filters safe for looking directly at a partially eclipsed Sun are those meeting the international standard ISO 12312-2, which specifies transmission limits for visible light, ultraviolet and infrared. Genuine eclipse glasses reduce visible light by a factor of roughly 100,000, which is why nothing but the Sun is visible through them. Before use, check three things. First, the ISO 12312-2 marking should be printed on the glasses along with the manufacturer's name and address; unbranded filters with no traceable manufacturer should not be trusted regardless of markings, because counterfeit glasses carrying fake ISO text have circulated widely before previous eclipses, particularly through third party marketplace sellers. Second, inspect the filter material against a bright indoor light: any scratch, pinhole, crease or delamination means the glasses must be discarded. Third, test them indoors: through genuine eclipse filters you should see essentially nothing except the very brightest lamp filaments. Glasses bought for the 2015 or 1999 eclipses should be treated cautiously, as older products predate the current standard and the filter material degrades. Reputable sources include established astronomy retailers, science museums and opticians rather than unknown online sellers.

What is never safe

Several widely believed viewing methods are dangerous and worth stating plainly. Ordinary sunglasses, even dark category 4 lenses stacked in multiple pairs, transmit thousands of times more light than a certified solar filter and provide no meaningful protection. Smoked glass, exposed photographic film, CDs, DVDs, crisp packets and space blankets are all traditional folk methods that fail modern transmission testing, particularly in the infrared wavelengths that cause thermal retinal damage without visible brightness. Looking through a phone camera is unsafe both for the eye, because people inevitably glance past the screen at the Sun while framing, and for the camera sensor. The most dangerous combination of all is viewing through binoculars, a telescope or a camera telephoto lens while wearing eclipse glasses: the magnifying optics concentrate sunlight to an intensity that burns through the filter almost instantly. Optical instruments require purpose made solar filters fitted at the front of the objective lens, never at the eyepiece. Parents should supervise children throughout, since properly fitted glasses can slip on smaller faces, and should treat the eclipse the way opticians recommend: brief, filtered glances rather than sustained staring, even with certified protection.

Free and safe alternatives

Anyone unable to obtain certified glasses before Wednesday evening has genuinely good options that cost nothing. A pinhole projector takes two pieces of card: make a small clean hole in one, stand with your back to the Sun, and let sunlight pass through the hole onto the second card, where an inverted image of the crescent Sun will be projected. The smaller and cleaner the hole, the sharper the image; a larger separation between the cards produces a bigger image. A kitchen colander produces dozens of crescent images at once, and the natural gaps between tree leaves do the same on the ground, one of the most photogenic and least appreciated eclipse phenomena. A small mirror covered in paper with a hole cut in it can project the Sun's image onto a shaded wall for group viewing. Livestreams from observatories in the totality path across Iceland and Spain will show the full spectacle, including phenomena invisible from Britain such as the corona. All projection methods share the same rule: you look at the projected image, never back along the light path towards the Sun itself.

Timing, weather and the consumer angle

The eclipse takes place during Wednesday evening, with the deepest phase over Britain falling broadly within the 6pm to 8pm window and exact timing varying by a few minutes with location; north western areas see the greatest obscuration. Check a location specific timing source on the day rather than relying on national averages, and have a viewing plan for the full window since the partial phases last well over an hour. On the consumer protection side, the late surge in demand is exactly the environment in which counterfeit and overpriced products thrive. Listings that cannot name a manufacturer, glasses shipped loose without packaging, and prices dramatically above the typical £2 to £5 for cardboard framed filters are all warning signs. Buyers who receive glasses that fail the inspection checks described above should not use them and can pursue refunds through the retailer under the Consumer Rights Act 2015, which requires goods to be as described and fit for purpose. Given that a comparable eclipse will not be visible from Britain until the 2090s, an evening of caution is a small price for an event most people will see once. For related consumer coverage see the before-you guides, household bills section, money guides and the news desk.

Frequently asked questions

Are sunglasses safe for viewing the solar eclipse?

No. Even the darkest sunglasses transmit thousands of times more light than a certified solar filter. Only glasses meeting the ISO 12312-2 standard are safe for looking directly at the partially eclipsed Sun.

How can I check whether my eclipse glasses are genuine?

Look for the ISO 12312-2 marking plus a named manufacturer and address, inspect the filters for scratches or pinholes, and test indoors: genuine filters show almost nothing except the brightest lamp filaments.

How much of the Sun will be covered in the UK on 12 August 2026?

Up to 95% over parts of Britain, with north western areas seeing the greatest obscuration. The path of totality crosses Iceland and northern Spain, so the UK sees a deep partial eclipse.

How do I make a pinhole projector?

Make a small clean hole in one piece of card, stand with your back to the Sun, and let light pass through the hole onto a second card. An inverted image of the crescent Sun is projected onto the second card.

Can I photograph the eclipse with my phone?

Not by pointing it directly at the Sun without a solar filter, which risks both your eyes while framing and the camera sensor. Photograph projected images, or fit a certified solar filter over the lens.