Ask Andy: Your Eclipse Glasses Questions Answered

Straight answers to the most common eclipse glasses questions — from someone who manufactures them.

I am Andy Lunt, founder of Lunt Solar Systems. We have been manufacturing solar telescopes, solar filters, and eclipse glasses for over 25 years. Our eclipse glasses are CE certified under EN ISO 12312-2:2022 and have been used by millions of people across multiple eclipse cycles.

With the August 12, 2026 total solar eclipse crossing Europe, I am seeing the same questions come up now that came up before every previous eclipse. Some of these questions have simple answers. Others require more nuance than most websites provide. Here are the honest answers.

Safety Questions

Yes — if they genuinely comply with ISO 12312-2. The standard requires that eclipse glasses block 99.999% of visible light, 100% of UV radiation, and nearly all infrared. A properly manufactured pair of ISO-compliant eclipse glasses reduces the Sun to a comfortable, safe brightness. The danger is not from compliant glasses — it is from glasses that claim compliance but were never tested. This is why verification matters. See our guide: How to Spot Fake Eclipse Glasses.

Compliant eclipse glasses cannot damage your eyes under normal use. The entire purpose of ISO 12312-2 is to define the safety threshold. However, glasses with defects — scratches, pinholes, delamination of the filter film, or creased lenses — can allow concentrated sunlight through. Always inspect your glasses before each use. Hold them up to a bright indoor light. You should see only a very faint, uniform glow. If you see any bright points, spots, or streaks of light, the glasses are damaged and should not be used.

Solar retinopathy is damage to the retina caused by looking at the Sun without adequate protection. The focused solar radiation burns the photoreceptor cells in the macula — the part of your retina responsible for central, detailed vision. The damage is painless because there are no pain receptors in the retina. Symptoms typically appear hours after exposure and include blurred central vision, a persistent blind spot, distorted images, and altered color perception. In many cases the damage is permanent. There is no surgical treatment.

With properly certified eclipse glasses, you can look at the Sun for as long as you like during the partial phases of an eclipse. There is no cumulative time limit with compliant glasses because the filter reduces the light to safe levels. However, if your eyes feel uncomfortable or strained at any point, take a break. Discomfort is not a sign that the glasses are failing — it usually means your eyes are fatigued from the unusual brightness and contrast.

No. Never. Eclipse glasses are designed for naked-eye viewing only. Binoculars and telescopes concentrate light by a factor of hundreds or thousands. Eclipse glasses cannot withstand this concentrated energy — the filter material will be destroyed in seconds and the focused sunlight will cause instant, severe eye damage. Telescopes and binoculars require their own dedicated solar filters mounted at the front of the instrument. This is stated on every pair of Lunt eclipse glasses and it is not a suggestion — it is an absolute safety requirement.

Buying and Verification Questions

Check for three things. First, the manufacturer’s full name and address must be printed on the glasses — not just a logo or brand name. Second, the glasses should reference ISO 12312-2 (or EN ISO 12312-2:2022 for EU-certified products). Third, if you are in Europe, look for a CE mark followed by a four-digit Notified Body number. You can verify that number in the EU’s NANDO database. If any of these are missing, treat the glasses as suspect. For a complete verification walkthrough, see our guide: How to Spot Fake Eclipse Glasses.

It depends on the seller. Amazon has strengthened its compliance requirements for eclipse glasses, particularly on EU marketplaces where PPE documentation is now mandatory. Products from established manufacturers with verifiable certifications are safe. However, Amazon is a marketplace — third-party sellers can list products, and enforcement is not instantaneous. The same verification steps apply: check the manufacturer name and address, confirm ISO 12312-2 compliance, and for EU purchases, verify the CE mark and Notified Body number. Lunt eclipse glasses are available on Amazon across all major European marketplaces and meet all applicable requirements.

ISO 12312-2 is the international safety standard that defines what eclipse glasses must do — how much light they must block, how uniform the filter must be, what labeling is required. CE marking is the EU’s legal framework for putting those glasses on the market in Europe. In the EU, eclipse glasses are classified as Personal Protective Equipment (PPE) Category II, which requires independent testing by a Notified Body before the CE mark can be applied. A product can be ISO 12312-2 compliant without having CE marking (common for US-only products), but it cannot be legally sold in the EU without CE marking. For the full explanation, see: Eclipse Glasses in Europe: CE Marking, PPE Rules & What You Need to Know.

Eclipse glasses are simple products to manufacture — the raw materials cost very little. The cost difference between brands mostly reflects the quality of the optical film, the testing and certification process, and the manufacturer’s investment in genuine compliance. Cheap glasses from established, verified manufacturers can be perfectly safe. Cheap glasses from unknown sellers with no verifiable manufacturer information are the risk. Price alone does not determine safety — but a product that is dramatically cheaper than the market usually cuts corners somewhere, and with eclipse glasses those corners can be your eyesight.

Lunt Solar Systems offers wholesale pricing for schools, universities, tourism boards, science outreach programs, and retailers through our Eclipse Glasses Europe 2026 page. Our glasses are CE certified, PPE Category II compliant, and ship from European fulfillment. Volume pricing starts at quantities of 500 and scales from there. Contact sales@luntsolarsystems.com for quotes.

Reuse, Storage, and Care Questions

Yes — if they pass a visual inspection. Eclipse glasses do not expire in the way food does. The filter material is stable and does not degrade with age under normal storage conditions. Before reuse, inspect every pair carefully. Hold them up to a bright light and look for scratches, pinholes, creases, tears, or separation of the filter material from the frame. If the filter is intact and undamaged, the glasses are safe to use again. If there is any damage at all, discard them.

Store them flat in a dry location, away from direct sunlight and moisture. Avoid folding them if possible — creases in the filter film can create weak points. A drawer, envelope, or book are all fine storage locations. The main enemies are physical damage (bending, scratching, puncturing) and moisture (which can cause the filter film to delaminate from the frame over time). Properly stored glasses will last for decades.

Be extremely careful. The filter material is thin and fragile. Do not use water, cleaning solution, or any kind of cloth or tissue on the lens surface. If there is dust or a fingerprint, you can try gently blowing it off. If the lens is smudged or dirty enough to affect your view, it is safer to discard the glasses and use a fresh pair than to risk scratching the filter by cleaning it. A scratch that is invisible to your eye can transmit enough focused sunlight to cause damage.

Questions About Children and Eclipse Viewing

Yes. The same glasses that are safe for adults are safe for children. Lunt manufactures both adult-sized and junior-sized eclipse glasses — the junior size provides a better fit for smaller faces, which helps ensure the glasses stay in position. The filter material is identical in both sizes.

There is no universal minimum age. The practical question is whether the child can understand and follow the instruction to keep the glasses on while looking at the Sun and to look away before removing them. Most children aged 5 and above can do this reliably with supervision. For younger children who may not keep the glasses on consistently, pinhole projection or watching a livestream is a safer option. Children should always be supervised by an adult while using eclipse glasses. Never leave young children unattended with eclipse glasses during an eclipse.

Yes, and for young children this is actually recommended. Hold the glasses firmly against the child’s face, ensuring no gaps around the edges, and look at the Sun together. When you are ready to stop, turn both of you away from the Sun before removing the glasses. This gives you full control of the viewing experience and eliminates the risk of a child pulling the glasses off while looking at the Sun.

Questions About the August 2026 Eclipse

The total solar eclipse occurs on August 12, 2026. The path of totality crosses the Arctic, Iceland, the Faroe Islands, northern Spain (including parts of Valencia, the Balearic Islands, and the Mediterranean coast), and North Africa. Partial phases will be visible across all of Europe, North Africa, the Middle East, and western Asia. This is the first total solar eclipse visible from mainland Europe since 1999.

Yes — for all partial phases. During totality (when the Moon completely covers the Sun), you can observe briefly with the naked eye. But totality lasts only a few minutes and is only visible from within the narrow path of totality. For the hours of partial phases before and after totality — and for everyone outside the path of totality who will see a partial eclipse — eclipse glasses are essential. Looking at a partially eclipsed Sun without protection is just as dangerous as looking at the full Sun.

Now. Not in July, not in August. Every eclipse cycle follows the same pattern: gradual interest building, sudden demand spike, and supply shortages in the final weeks. After the 2024 eclipse, some retailers sold out entirely a month before the event. Certified eclipse glasses with genuine ISO 12312-2 compliance and EU PPE Category II certification are manufactured months in advance. Buying early ensures you get glasses from an established manufacturer, not a last-minute vendor scrambling to meet demand with untested product.

Lunt Solar Systems eclipse glasses are available directly from our website at luntsolarsystems.com with VAT-included pricing and European shipping. They are also available on Amazon in Germany, France, Spain, Italy, and other EU countries, as well as Amazon UK. For bulk orders (schools, events, municipalities, tourism operators), see our Eclipse Glasses Europe 2026 page or email sales@luntsolarsystems.com.

Buy on Amazon Europe through the following links:

Buy CE-Certified Eclipse Glasses in Your Country ISO 12312-2 compliant | CE marked | Ships locally

Germany Amazon.de France Amazon.fr Spain Amazon.es Italy Amazon.it Netherlands Amazon.nl

Belgium Amazon.com.be Austria Amazon.de Poland Amazon.pl Portugal Amazon.es UK Amazon.co.uk

Lunt eclipse glasses are CE certified under EN ISO 12312-2:2022 | #1 best-selling eclipse glasses on Amazon worldwide

Read the full eclipse safety series:

Article 1: What Is ISO 12312-2? The Eclipse Glasses Safety Standard Explained →

Article 2: How to Spot Fake Eclipse Glasses: A Verification Guide →

Article 3: Eclipse Glasses in Europe: CE Marking, PPE Rules & What You Need to Know →

Article 4: Ask Andy — Your Eclipse Glasses Questions Answered (you are here)

 

Buy CE-certified Lunt eclipse glasses: luntsolarsystems.com/collections/eclipse-glasses

Bulk/wholesale for Europe: luntsolarsystems.com/pages/eclipse-glasses-europe-2026

Questions? Email sales@luntsolarsystems.com or call 520-344-7348.

Andy Lunt is the founder of Lunt Solar Systems, a precision solar telescope and eclipse glasses manufacturer based in Tucson, Arizona, with over 25 years of experience in solar optics. Lunt eclipse glasses are CE certified under EN ISO 12312-2:2022 and are the #1 best-selling eclipse glasses on Amazon worldwide.