Old eclipse glasses from 1999 or 2015: still safe for August 12, 2026?
Found a pair of cardboard eclipse glasses from 1999, 2015, or a US trip in 2017 at the back of a drawer? A fair question as August 12, 2026 approaches — and the honest answer comes in two parts: the filter itself does not "expire", but its condition and compliance must be checked thoroughly. When in doubt, replace them: your retina is at stake.
What the standard actually says
A commonly misunderstood point: a filter complying with the ISO 12312-2 standard (introduced in 2015) and in perfect condition does not degrade spontaneously over time. The "discard after 3 years" notices on older models reflected earlier regulations, not any inevitable deterioration of the filter.
The real problem lies elsewhere:
Pre-2015 glasses
Predating the current standard: it is impossible to guarantee their original filtration level, and fifteen to twenty-five years of storage have had ample time to damage them.
Storage is everything
Folded in a drawer, compressed in a box, exposed to moisture or heat, the membranes develop micro-cracks, creases and micro-holes — often invisible to the naked eye in ambient light, but which let through dangerous radiation.
Cardboard frames age poorly
The filter can detach at the edges, and the frame may lose its secure fit.
The 3-step test before reusing
Close visual inspection
Hold the filter stretched up to a window: look for scratches, visible creases, bright spots, and separating edges. Any defect = bin it.
The lamp test
Look at a bright LED bulb through the filter. You should only see a very dim, sharp and uniform image of the source, with no stray light points. If you can distinguish anything else (room edges, halos, pin-pricks of light), the filter is leaking.
Certification check
The ISO 12312-2 marking and the manufacturer's identity must appear on the arms. Missing? You have no way of knowing what this plastic is actually filtering.
⚠ One test that proves nothing
"I tried them on and nothing hurt." Solar retinopathy is painless and delayed — the absence of discomfort guarantees absolutely nothing.
Our frank recommendation
For an object costing €2–5, the calculation is straightforward:
Pre-1999 glasses or those with no visible certification : replace without question.
Recent ISO 12312-2 glasses (2021, 2024), stored flat in their packaging : reusable if they pass the 3-step test.
Any doubt at all : replace them. A new certified pair costs less than a coffee; a macular lesion is permanent.
And if you do replace them, do it now: stock shortages are already being flagged ahead of August 12 — just as in 1999, when the lack of glasses pushed observers towards improvised protections, resulting in 147 documented cases of severe retinal damage.
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