If you recently purchased a pair of eclipse-viewing glasses from Amazon.com, you may be due for a refund.

The coverage of an eclipse always includes proper viewing instructions, and as the Aug. 21 total eclipse approaches, many have taken warnings to heart and purchased solar eclipse glasses to ensure safe viewing for themselves and their family.

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Amid reports that the American Astronomical Society (AAS) had identified counterfeit products or products that don’t meet their safety standard available on Amazon, the retailer sent the following email to some customers who had purchased glasses from sources they could not verify:

“Amazon has not received confirmation from the supplier of your order that they sourced the item from a recommended manufacturer.  We recommend that you DO NOT use this product to view the sun or the eclipse.”

The email further states the refunds should be available in 7-10 days and that customers don’t need to return the glasses they’ve purchased.

The AAS recommends that glasses and viewers meet the ISO 12312-2 international safety standard. To be sure you’ve purchased your eclipse glasses or viewers from a reputable source, the AAS has published a list of reputable vendors on its website.